diff --git a/examples/6-scaffolding-ts-hasura/src/models/ChoicesAggregateFieldsModel.base.ts b/examples/6-scaffolding-ts-hasura/src/models/ChoicesAggregateFieldsModel.base.ts
index 0e74209e..b2b9646b 100644
--- a/examples/6-scaffolding-ts-hasura/src/models/ChoicesAggregateFieldsModel.base.ts
+++ b/examples/6-scaffolding-ts-hasura/src/models/ChoicesAggregateFieldsModel.base.ts
@@ -57,16 +57,16 @@ export const ChoicesAggregateFieldsModelBase = ModelBase
 
 export class ChoicesAggregateFieldsModelSelector extends QueryBuilder {
   get count() { return this.__attr(`count`) }
-  avg(builder: string | ChoicesAvgFieldsModelSelector | ((selector: ChoicesAvgFieldsModelSelector) => ChoicesAvgFieldsModelSelector) | undefined) { return this.__child(`avg`, ChoicesAvgFieldsModelSelector, builder) }
-  max(builder: string | ChoicesMaxFieldsModelSelector | ((selector: ChoicesMaxFieldsModelSelector) => ChoicesMaxFieldsModelSelector) | undefined) { return this.__child(`max`, ChoicesMaxFieldsModelSelector, builder) }
-  min(builder: string | ChoicesMinFieldsModelSelector | ((selector: ChoicesMinFieldsModelSelector) => ChoicesMinFieldsModelSelector) | undefined) { return this.__child(`min`, ChoicesMinFieldsModelSelector, builder) }
-  stddev(builder: string | ChoicesStddevFieldsModelSelector | ((selector: ChoicesStddevFieldsModelSelector) => ChoicesStddevFieldsModelSelector) | undefined) { return this.__child(`stddev`, ChoicesStddevFieldsModelSelector, builder) }
-  stddev_pop(builder: string | ChoicesStddevPopFieldsModelSelector | ((selector: ChoicesStddevPopFieldsModelSelector) => ChoicesStddevPopFieldsModelSelector) | undefined) { return this.__child(`stddev_pop`, ChoicesStddevPopFieldsModelSelector, builder) }
-  stddev_samp(builder: string | ChoicesStddevSampFieldsModelSelector | ((selector: ChoicesStddevSampFieldsModelSelector) => ChoicesStddevSampFieldsModelSelector) | undefined) { return this.__child(`stddev_samp`, ChoicesStddevSampFieldsModelSelector, builder) }
-  sum(builder: string | ChoicesSumFieldsModelSelector | ((selector: ChoicesSumFieldsModelSelector) => ChoicesSumFieldsModelSelector) | undefined) { return this.__child(`sum`, ChoicesSumFieldsModelSelector, builder) }
-  var_pop(builder: string | ChoicesVarPopFieldsModelSelector | ((selector: ChoicesVarPopFieldsModelSelector) => ChoicesVarPopFieldsModelSelector) | undefined) { return this.__child(`var_pop`, ChoicesVarPopFieldsModelSelector, builder) }
-  var_samp(builder: string | ChoicesVarSampFieldsModelSelector | ((selector: ChoicesVarSampFieldsModelSelector) => ChoicesVarSampFieldsModelSelector) | undefined) { return this.__child(`var_samp`, ChoicesVarSampFieldsModelSelector, builder) }
-  variance(builder: string | ChoicesVarianceFieldsModelSelector | ((selector: ChoicesVarianceFieldsModelSelector) => ChoicesVarianceFieldsModelSelector) | undefined) { return this.__child(`variance`, ChoicesVarianceFieldsModelSelector, builder) }
+  avg(builder: string | ChoicesAvgFieldsModelSelector | ((selector: ChoicesAvgFieldsModelSelector) => ChoicesAvgFieldsModelSelector) | undefined = undefined) { return this.__child(`avg`, ChoicesAvgFieldsModelSelector, builder) }
+  max(builder: string | ChoicesMaxFieldsModelSelector | ((selector: ChoicesMaxFieldsModelSelector) => ChoicesMaxFieldsModelSelector) | undefined = undefined) { return this.__child(`max`, ChoicesMaxFieldsModelSelector, builder) }
+  min(builder: string | ChoicesMinFieldsModelSelector | ((selector: ChoicesMinFieldsModelSelector) => ChoicesMinFieldsModelSelector) | undefined = undefined) { return this.__child(`min`, ChoicesMinFieldsModelSelector, builder) }
+  stddev(builder: string | ChoicesStddevFieldsModelSelector | ((selector: ChoicesStddevFieldsModelSelector) => ChoicesStddevFieldsModelSelector) | undefined = undefined) { return this.__child(`stddev`, ChoicesStddevFieldsModelSelector, builder) }
+  stddev_pop(builder: string | ChoicesStddevPopFieldsModelSelector | ((selector: ChoicesStddevPopFieldsModelSelector) => ChoicesStddevPopFieldsModelSelector) | undefined = undefined) { return this.__child(`stddev_pop`, ChoicesStddevPopFieldsModelSelector, builder) }
+  stddev_samp(builder: string | ChoicesStddevSampFieldsModelSelector | ((selector: ChoicesStddevSampFieldsModelSelector) => ChoicesStddevSampFieldsModelSelector) | undefined = undefined) { return this.__child(`stddev_samp`, ChoicesStddevSampFieldsModelSelector, builder) }
+  sum(builder: string | ChoicesSumFieldsModelSelector | ((selector: ChoicesSumFieldsModelSelector) => ChoicesSumFieldsModelSelector) | undefined = undefined) { return this.__child(`sum`, ChoicesSumFieldsModelSelector, builder) }
+  var_pop(builder: string | ChoicesVarPopFieldsModelSelector | ((selector: ChoicesVarPopFieldsModelSelector) => ChoicesVarPopFieldsModelSelector) | undefined = undefined) { return this.__child(`var_pop`, ChoicesVarPopFieldsModelSelector, builder) }
+  var_samp(builder: string | ChoicesVarSampFieldsModelSelector | ((selector: ChoicesVarSampFieldsModelSelector) => ChoicesVarSampFieldsModelSelector) | undefined = undefined) { return this.__child(`var_samp`, ChoicesVarSampFieldsModelSelector, builder) }
+  variance(builder: string | ChoicesVarianceFieldsModelSelector | ((selector: ChoicesVarianceFieldsModelSelector) => ChoicesVarianceFieldsModelSelector) | undefined = undefined) { return this.__child(`variance`, ChoicesVarianceFieldsModelSelector, builder) }
 }
 export function selectFromChoicesAggregateFields() {
   return new ChoicesAggregateFieldsModelSelector()
diff --git a/examples/6-scaffolding-ts-hasura/src/models/ChoicesAggregateModel.base.ts b/examples/6-scaffolding-ts-hasura/src/models/ChoicesAggregateModel.base.ts
index 05a4a786..eb1831f0 100644
--- a/examples/6-scaffolding-ts-hasura/src/models/ChoicesAggregateModel.base.ts
+++ b/examples/6-scaffolding-ts-hasura/src/models/ChoicesAggregateModel.base.ts
@@ -36,8 +36,8 @@ export const ChoicesAggregateModelBase = withTypedRefs<Refs>()(ModelBase
   })))
 
 export class ChoicesAggregateModelSelector extends QueryBuilder {
-  aggregate(builder: string | ChoicesAggregateFieldsModelSelector | ((selector: ChoicesAggregateFieldsModelSelector) => ChoicesAggregateFieldsModelSelector) | undefined) { return this.__child(`aggregate`, ChoicesAggregateFieldsModelSelector, builder) }
-  nodes(builder: string | ChoicesModelSelector | ((selector: ChoicesModelSelector) => ChoicesModelSelector) | undefined) { return this.__child(`nodes`, ChoicesModelSelector, builder) }
+  aggregate(builder: string | ChoicesAggregateFieldsModelSelector | ((selector: ChoicesAggregateFieldsModelSelector) => ChoicesAggregateFieldsModelSelector) | undefined = undefined) { return this.__child(`aggregate`, ChoicesAggregateFieldsModelSelector, builder) }
+  nodes(builder: string | ChoicesModelSelector | ((selector: ChoicesModelSelector) => ChoicesModelSelector) | undefined = undefined) { return this.__child(`nodes`, ChoicesModelSelector, builder) }
 }
 export function selectFromChoicesAggregate() {
   return new ChoicesAggregateModelSelector()
diff --git a/examples/6-scaffolding-ts-hasura/src/models/ChoicesModel.base.ts b/examples/6-scaffolding-ts-hasura/src/models/ChoicesModel.base.ts
index 3bfa68bb..ae53a6bd 100644
--- a/examples/6-scaffolding-ts-hasura/src/models/ChoicesModel.base.ts
+++ b/examples/6-scaffolding-ts-hasura/src/models/ChoicesModel.base.ts
@@ -38,7 +38,7 @@ export class ChoicesModelSelector extends QueryBuilder {
   get id() { return this.__attr(`id`) }
   get poll_id() { return this.__attr(`poll_id`) }
   get text() { return this.__attr(`text`) }
-  poll(builder: string | PollsModelSelector | ((selector: PollsModelSelector) => PollsModelSelector) | undefined) { return this.__child(`poll`, PollsModelSelector, builder) }
+  poll(builder: string | PollsModelSelector | ((selector: PollsModelSelector) => PollsModelSelector) | undefined = undefined) { return this.__child(`poll`, PollsModelSelector, builder) }
 }
 export function selectFromChoices() {
   return new ChoicesModelSelector()
diff --git a/examples/6-scaffolding-ts-hasura/src/models/ChoicesMutationResponseModel.base.ts b/examples/6-scaffolding-ts-hasura/src/models/ChoicesMutationResponseModel.base.ts
index 67c157a8..20818a94 100644
--- a/examples/6-scaffolding-ts-hasura/src/models/ChoicesMutationResponseModel.base.ts
+++ b/examples/6-scaffolding-ts-hasura/src/models/ChoicesMutationResponseModel.base.ts
@@ -35,7 +35,7 @@ export const ChoicesMutationResponseModelBase = withTypedRefs<Refs>()(ModelBase
 
 export class ChoicesMutationResponseModelSelector extends QueryBuilder {
   get affected_rows() { return this.__attr(`affected_rows`) }
-  returning(builder: string | ChoicesModelSelector | ((selector: ChoicesModelSelector) => ChoicesModelSelector) | undefined) { return this.__child(`returning`, ChoicesModelSelector, builder) }
+  returning(builder: string | ChoicesModelSelector | ((selector: ChoicesModelSelector) => ChoicesModelSelector) | undefined = undefined) { return this.__child(`returning`, ChoicesModelSelector, builder) }
 }
 export function selectFromChoicesMutationResponse() {
   return new ChoicesMutationResponseModelSelector()
diff --git a/examples/6-scaffolding-ts-hasura/src/models/MutationRootModel.base.ts b/examples/6-scaffolding-ts-hasura/src/models/MutationRootModel.base.ts
index 98b1cea9..1c435498 100644
--- a/examples/6-scaffolding-ts-hasura/src/models/MutationRootModel.base.ts
+++ b/examples/6-scaffolding-ts-hasura/src/models/MutationRootModel.base.ts
@@ -35,12 +35,12 @@ export const MutationRootModelBase = ModelBase
   }))
 
 export class MutationRootModelSelector extends QueryBuilder {
-  delete_choices(builder: string | ChoicesMutationResponseModelSelector | ((selector: ChoicesMutationResponseModelSelector) => ChoicesMutationResponseModelSelector) | undefined, args: { where: ChoicesBoolExp }) { return this.__child(`delete_choices`+ (args ? '('+['where'].map((argName) => ((args as any)[argName] ? `${argName}: ${JSON.stringify((args as any)[argName])}` : null) ).filter((v) => v!=null).join(', ') + ')': ''), ChoicesMutationResponseModelSelector, builder) }
-  delete_polls(builder: string | PollsMutationResponseModelSelector | ((selector: PollsMutationResponseModelSelector) => PollsMutationResponseModelSelector) | undefined, args: { where: PollsBoolExp }) { return this.__child(`delete_polls`+ (args ? '('+['where'].map((argName) => ((args as any)[argName] ? `${argName}: ${JSON.stringify((args as any)[argName])}` : null) ).filter((v) => v!=null).join(', ') + ')': ''), PollsMutationResponseModelSelector, builder) }
-  insert_choices(builder: string | ChoicesMutationResponseModelSelector | ((selector: ChoicesMutationResponseModelSelector) => ChoicesMutationResponseModelSelector) | undefined, args: { objects: ChoicesInsertInput[], onConflict?: (ChoicesOnConflict | null) }) { return this.__child(`insert_choices`+ (args ? '('+['objects', 'onConflict'].map((argName) => ((args as any)[argName] ? `${argName}: ${JSON.stringify((args as any)[argName])}` : null) ).filter((v) => v!=null).join(', ') + ')': ''), ChoicesMutationResponseModelSelector, builder) }
-  insert_polls(builder: string | PollsMutationResponseModelSelector | ((selector: PollsMutationResponseModelSelector) => PollsMutationResponseModelSelector) | undefined, args: { objects: PollsInsertInput[], onConflict?: (PollsOnConflict | null) }) { return this.__child(`insert_polls`+ (args ? '('+['objects', 'onConflict'].map((argName) => ((args as any)[argName] ? `${argName}: ${JSON.stringify((args as any)[argName])}` : null) ).filter((v) => v!=null).join(', ') + ')': ''), PollsMutationResponseModelSelector, builder) }
-  update_choices(builder: string | ChoicesMutationResponseModelSelector | ((selector: ChoicesMutationResponseModelSelector) => ChoicesMutationResponseModelSelector) | undefined, args: { inc?: (ChoicesIncInput | null), set?: (ChoicesSetInput | null), where: ChoicesBoolExp }) { return this.__child(`update_choices`+ (args ? '('+['inc', 'set', 'where'].map((argName) => ((args as any)[argName] ? `${argName}: ${JSON.stringify((args as any)[argName])}` : null) ).filter((v) => v!=null).join(', ') + ')': ''), ChoicesMutationResponseModelSelector, builder) }
-  update_polls(builder: string | PollsMutationResponseModelSelector | ((selector: PollsMutationResponseModelSelector) => PollsMutationResponseModelSelector) | undefined, args: { inc?: (PollsIncInput | null), set?: (PollsSetInput | null), where: PollsBoolExp }) { return this.__child(`update_polls`+ (args ? '('+['inc', 'set', 'where'].map((argName) => ((args as any)[argName] ? `${argName}: ${JSON.stringify((args as any)[argName])}` : null) ).filter((v) => v!=null).join(', ') + ')': ''), PollsMutationResponseModelSelector, builder) }
+  delete_choices(builder: string | ChoicesMutationResponseModelSelector | ((selector: ChoicesMutationResponseModelSelector) => ChoicesMutationResponseModelSelector) | undefined = undefined, args: { where: ChoicesBoolExp }) { return this.__child(`delete_choices`+ (args ? '('+['where'].map((argName) => ((args as any)[argName] ? `${argName}: ${JSON.stringify((args as any)[argName])}` : null) ).filter((v) => v!=null).join(', ') + ')': ''), ChoicesMutationResponseModelSelector, builder) }
+  delete_polls(builder: string | PollsMutationResponseModelSelector | ((selector: PollsMutationResponseModelSelector) => PollsMutationResponseModelSelector) | undefined = undefined, args: { where: PollsBoolExp }) { return this.__child(`delete_polls`+ (args ? '('+['where'].map((argName) => ((args as any)[argName] ? `${argName}: ${JSON.stringify((args as any)[argName])}` : null) ).filter((v) => v!=null).join(', ') + ')': ''), PollsMutationResponseModelSelector, builder) }
+  insert_choices(builder: string | ChoicesMutationResponseModelSelector | ((selector: ChoicesMutationResponseModelSelector) => ChoicesMutationResponseModelSelector) | undefined = undefined, args: { objects: ChoicesInsertInput[], onConflict?: (ChoicesOnConflict | null) }) { return this.__child(`insert_choices`+ (args ? '('+['objects', 'onConflict'].map((argName) => ((args as any)[argName] ? `${argName}: ${JSON.stringify((args as any)[argName])}` : null) ).filter((v) => v!=null).join(', ') + ')': ''), ChoicesMutationResponseModelSelector, builder) }
+  insert_polls(builder: string | PollsMutationResponseModelSelector | ((selector: PollsMutationResponseModelSelector) => PollsMutationResponseModelSelector) | undefined = undefined, args: { objects: PollsInsertInput[], onConflict?: (PollsOnConflict | null) }) { return this.__child(`insert_polls`+ (args ? '('+['objects', 'onConflict'].map((argName) => ((args as any)[argName] ? `${argName}: ${JSON.stringify((args as any)[argName])}` : null) ).filter((v) => v!=null).join(', ') + ')': ''), PollsMutationResponseModelSelector, builder) }
+  update_choices(builder: string | ChoicesMutationResponseModelSelector | ((selector: ChoicesMutationResponseModelSelector) => ChoicesMutationResponseModelSelector) | undefined = undefined, args: { inc?: (ChoicesIncInput | null), set?: (ChoicesSetInput | null), where: ChoicesBoolExp }) { return this.__child(`update_choices`+ (args ? '('+['inc', 'set', 'where'].map((argName) => ((args as any)[argName] ? `${argName}: ${JSON.stringify((args as any)[argName])}` : null) ).filter((v) => v!=null).join(', ') + ')': ''), ChoicesMutationResponseModelSelector, builder) }
+  update_polls(builder: string | PollsMutationResponseModelSelector | ((selector: PollsMutationResponseModelSelector) => PollsMutationResponseModelSelector) | undefined = undefined, args: { inc?: (PollsIncInput | null), set?: (PollsSetInput | null), where: PollsBoolExp }) { return this.__child(`update_polls`+ (args ? '('+['inc', 'set', 'where'].map((argName) => ((args as any)[argName] ? `${argName}: ${JSON.stringify((args as any)[argName])}` : null) ).filter((v) => v!=null).join(', ') + ')': ''), PollsMutationResponseModelSelector, builder) }
 }
 export function selectFromMutationRoot() {
   return new MutationRootModelSelector()
diff --git a/examples/6-scaffolding-ts-hasura/src/models/PollsAggregateFieldsModel.base.ts b/examples/6-scaffolding-ts-hasura/src/models/PollsAggregateFieldsModel.base.ts
index 31dcd0d7..1acb6643 100644
--- a/examples/6-scaffolding-ts-hasura/src/models/PollsAggregateFieldsModel.base.ts
+++ b/examples/6-scaffolding-ts-hasura/src/models/PollsAggregateFieldsModel.base.ts
@@ -57,16 +57,16 @@ export const PollsAggregateFieldsModelBase = ModelBase
 
 export class PollsAggregateFieldsModelSelector extends QueryBuilder {
   get count() { return this.__attr(`count`) }
-  avg(builder: string | PollsAvgFieldsModelSelector | ((selector: PollsAvgFieldsModelSelector) => PollsAvgFieldsModelSelector) | undefined) { return this.__child(`avg`, PollsAvgFieldsModelSelector, builder) }
-  max(builder: string | PollsMaxFieldsModelSelector | ((selector: PollsMaxFieldsModelSelector) => PollsMaxFieldsModelSelector) | undefined) { return this.__child(`max`, PollsMaxFieldsModelSelector, builder) }
-  min(builder: string | PollsMinFieldsModelSelector | ((selector: PollsMinFieldsModelSelector) => PollsMinFieldsModelSelector) | undefined) { return this.__child(`min`, PollsMinFieldsModelSelector, builder) }
-  stddev(builder: string | PollsStddevFieldsModelSelector | ((selector: PollsStddevFieldsModelSelector) => PollsStddevFieldsModelSelector) | undefined) { return this.__child(`stddev`, PollsStddevFieldsModelSelector, builder) }
-  stddev_pop(builder: string | PollsStddevPopFieldsModelSelector | ((selector: PollsStddevPopFieldsModelSelector) => PollsStddevPopFieldsModelSelector) | undefined) { return this.__child(`stddev_pop`, PollsStddevPopFieldsModelSelector, builder) }
-  stddev_samp(builder: string | PollsStddevSampFieldsModelSelector | ((selector: PollsStddevSampFieldsModelSelector) => PollsStddevSampFieldsModelSelector) | undefined) { return this.__child(`stddev_samp`, PollsStddevSampFieldsModelSelector, builder) }
-  sum(builder: string | PollsSumFieldsModelSelector | ((selector: PollsSumFieldsModelSelector) => PollsSumFieldsModelSelector) | undefined) { return this.__child(`sum`, PollsSumFieldsModelSelector, builder) }
-  var_pop(builder: string | PollsVarPopFieldsModelSelector | ((selector: PollsVarPopFieldsModelSelector) => PollsVarPopFieldsModelSelector) | undefined) { return this.__child(`var_pop`, PollsVarPopFieldsModelSelector, builder) }
-  var_samp(builder: string | PollsVarSampFieldsModelSelector | ((selector: PollsVarSampFieldsModelSelector) => PollsVarSampFieldsModelSelector) | undefined) { return this.__child(`var_samp`, PollsVarSampFieldsModelSelector, builder) }
-  variance(builder: string | PollsVarianceFieldsModelSelector | ((selector: PollsVarianceFieldsModelSelector) => PollsVarianceFieldsModelSelector) | undefined) { return this.__child(`variance`, PollsVarianceFieldsModelSelector, builder) }
+  avg(builder: string | PollsAvgFieldsModelSelector | ((selector: PollsAvgFieldsModelSelector) => PollsAvgFieldsModelSelector) | undefined = undefined) { return this.__child(`avg`, PollsAvgFieldsModelSelector, builder) }
+  max(builder: string | PollsMaxFieldsModelSelector | ((selector: PollsMaxFieldsModelSelector) => PollsMaxFieldsModelSelector) | undefined = undefined) { return this.__child(`max`, PollsMaxFieldsModelSelector, builder) }
+  min(builder: string | PollsMinFieldsModelSelector | ((selector: PollsMinFieldsModelSelector) => PollsMinFieldsModelSelector) | undefined = undefined) { return this.__child(`min`, PollsMinFieldsModelSelector, builder) }
+  stddev(builder: string | PollsStddevFieldsModelSelector | ((selector: PollsStddevFieldsModelSelector) => PollsStddevFieldsModelSelector) | undefined = undefined) { return this.__child(`stddev`, PollsStddevFieldsModelSelector, builder) }
+  stddev_pop(builder: string | PollsStddevPopFieldsModelSelector | ((selector: PollsStddevPopFieldsModelSelector) => PollsStddevPopFieldsModelSelector) | undefined = undefined) { return this.__child(`stddev_pop`, PollsStddevPopFieldsModelSelector, builder) }
+  stddev_samp(builder: string | PollsStddevSampFieldsModelSelector | ((selector: PollsStddevSampFieldsModelSelector) => PollsStddevSampFieldsModelSelector) | undefined = undefined) { return this.__child(`stddev_samp`, PollsStddevSampFieldsModelSelector, builder) }
+  sum(builder: string | PollsSumFieldsModelSelector | ((selector: PollsSumFieldsModelSelector) => PollsSumFieldsModelSelector) | undefined = undefined) { return this.__child(`sum`, PollsSumFieldsModelSelector, builder) }
+  var_pop(builder: string | PollsVarPopFieldsModelSelector | ((selector: PollsVarPopFieldsModelSelector) => PollsVarPopFieldsModelSelector) | undefined = undefined) { return this.__child(`var_pop`, PollsVarPopFieldsModelSelector, builder) }
+  var_samp(builder: string | PollsVarSampFieldsModelSelector | ((selector: PollsVarSampFieldsModelSelector) => PollsVarSampFieldsModelSelector) | undefined = undefined) { return this.__child(`var_samp`, PollsVarSampFieldsModelSelector, builder) }
+  variance(builder: string | PollsVarianceFieldsModelSelector | ((selector: PollsVarianceFieldsModelSelector) => PollsVarianceFieldsModelSelector) | undefined = undefined) { return this.__child(`variance`, PollsVarianceFieldsModelSelector, builder) }
 }
 export function selectFromPollsAggregateFields() {
   return new PollsAggregateFieldsModelSelector()
diff --git a/examples/6-scaffolding-ts-hasura/src/models/PollsAggregateModel.base.ts b/examples/6-scaffolding-ts-hasura/src/models/PollsAggregateModel.base.ts
index c1a4d1b7..68b1ba5e 100644
--- a/examples/6-scaffolding-ts-hasura/src/models/PollsAggregateModel.base.ts
+++ b/examples/6-scaffolding-ts-hasura/src/models/PollsAggregateModel.base.ts
@@ -36,8 +36,8 @@ export const PollsAggregateModelBase = withTypedRefs<Refs>()(ModelBase
   })))
 
 export class PollsAggregateModelSelector extends QueryBuilder {
-  aggregate(builder: string | PollsAggregateFieldsModelSelector | ((selector: PollsAggregateFieldsModelSelector) => PollsAggregateFieldsModelSelector) | undefined) { return this.__child(`aggregate`, PollsAggregateFieldsModelSelector, builder) }
-  nodes(builder: string | PollsModelSelector | ((selector: PollsModelSelector) => PollsModelSelector) | undefined) { return this.__child(`nodes`, PollsModelSelector, builder) }
+  aggregate(builder: string | PollsAggregateFieldsModelSelector | ((selector: PollsAggregateFieldsModelSelector) => PollsAggregateFieldsModelSelector) | undefined = undefined) { return this.__child(`aggregate`, PollsAggregateFieldsModelSelector, builder) }
+  nodes(builder: string | PollsModelSelector | ((selector: PollsModelSelector) => PollsModelSelector) | undefined = undefined) { return this.__child(`nodes`, PollsModelSelector, builder) }
 }
 export function selectFromPollsAggregate() {
   return new PollsAggregateModelSelector()
diff --git a/examples/6-scaffolding-ts-hasura/src/models/PollsModel.base.ts b/examples/6-scaffolding-ts-hasura/src/models/PollsModel.base.ts
index 371e2fc9..88f2d387 100644
--- a/examples/6-scaffolding-ts-hasura/src/models/PollsModel.base.ts
+++ b/examples/6-scaffolding-ts-hasura/src/models/PollsModel.base.ts
@@ -56,8 +56,8 @@ export class PollsModelSelector extends QueryBuilder {
   get question() { return this.__attr(`question`) }
   get updated_at() { return this.__attr(`updated_at`) }
   get updated_by() { return this.__attr(`updated_by`) }
-  choices(builder: string | ChoicesModelSelector | ((selector: ChoicesModelSelector) => ChoicesModelSelector) | undefined, args?: { distinctOn?: ChoicesSelectColumn[], limit?: (number | null), offset?: (number | null), orderBy?: ChoicesOrderBy[], where?: (ChoicesBoolExp | null) }) { return this.__child(`choices`+ (args ? '('+['distinctOn', 'limit', 'offset', 'orderBy', 'where'].map((argName) => ((args as any)[argName] ? `${argName}: ${JSON.stringify((args as any)[argName])}` : null) ).filter((v) => v!=null).join(', ') + ')': ''), ChoicesModelSelector, builder) }
-  choices_aggregate(builder: string | ChoicesAggregateModelSelector | ((selector: ChoicesAggregateModelSelector) => ChoicesAggregateModelSelector) | undefined, args?: { distinctOn?: ChoicesSelectColumn[], limit?: (number | null), offset?: (number | null), orderBy?: ChoicesOrderBy[], where?: (ChoicesBoolExp | null) }) { return this.__child(`choices_aggregate`+ (args ? '('+['distinctOn', 'limit', 'offset', 'orderBy', 'where'].map((argName) => ((args as any)[argName] ? `${argName}: ${JSON.stringify((args as any)[argName])}` : null) ).filter((v) => v!=null).join(', ') + ')': ''), ChoicesAggregateModelSelector, builder) }
+  choices(builder: string | ChoicesModelSelector | ((selector: ChoicesModelSelector) => ChoicesModelSelector) | undefined = undefined, args?: { distinctOn?: ChoicesSelectColumn[], limit?: (number | null), offset?: (number | null), orderBy?: ChoicesOrderBy[], where?: (ChoicesBoolExp | null) }) { return this.__child(`choices`+ (args ? '('+['distinctOn', 'limit', 'offset', 'orderBy', 'where'].map((argName) => ((args as any)[argName] ? `${argName}: ${JSON.stringify((args as any)[argName])}` : null) ).filter((v) => v!=null).join(', ') + ')': ''), ChoicesModelSelector, builder) }
+  choices_aggregate(builder: string | ChoicesAggregateModelSelector | ((selector: ChoicesAggregateModelSelector) => ChoicesAggregateModelSelector) | undefined = undefined, args?: { distinctOn?: ChoicesSelectColumn[], limit?: (number | null), offset?: (number | null), orderBy?: ChoicesOrderBy[], where?: (ChoicesBoolExp | null) }) { return this.__child(`choices_aggregate`+ (args ? '('+['distinctOn', 'limit', 'offset', 'orderBy', 'where'].map((argName) => ((args as any)[argName] ? `${argName}: ${JSON.stringify((args as any)[argName])}` : null) ).filter((v) => v!=null).join(', ') + ')': ''), ChoicesAggregateModelSelector, builder) }
 }
 export function selectFromPolls() {
   return new PollsModelSelector()
diff --git a/examples/6-scaffolding-ts-hasura/src/models/PollsMutationResponseModel.base.ts b/examples/6-scaffolding-ts-hasura/src/models/PollsMutationResponseModel.base.ts
index 13234854..e94e6b4c 100644
--- a/examples/6-scaffolding-ts-hasura/src/models/PollsMutationResponseModel.base.ts
+++ b/examples/6-scaffolding-ts-hasura/src/models/PollsMutationResponseModel.base.ts
@@ -35,7 +35,7 @@ export const PollsMutationResponseModelBase = withTypedRefs<Refs>()(ModelBase
 
 export class PollsMutationResponseModelSelector extends QueryBuilder {
   get affected_rows() { return this.__attr(`affected_rows`) }
-  returning(builder: string | PollsModelSelector | ((selector: PollsModelSelector) => PollsModelSelector) | undefined) { return this.__child(`returning`, PollsModelSelector, builder) }
+  returning(builder: string | PollsModelSelector | ((selector: PollsModelSelector) => PollsModelSelector) | undefined = undefined) { return this.__child(`returning`, PollsModelSelector, builder) }
 }
 export function selectFromPollsMutationResponse() {
   return new PollsMutationResponseModelSelector()
diff --git a/examples/6-scaffolding-ts-hasura/src/models/QueryRootModel.base.ts b/examples/6-scaffolding-ts-hasura/src/models/QueryRootModel.base.ts
index 6e6fa7f4..c61a1348 100644
--- a/examples/6-scaffolding-ts-hasura/src/models/QueryRootModel.base.ts
+++ b/examples/6-scaffolding-ts-hasura/src/models/QueryRootModel.base.ts
@@ -50,12 +50,12 @@ export const QueryRootModelBase = withTypedRefs<Refs>()(ModelBase
   })))
 
 export class QueryRootModelSelector extends QueryBuilder {
-  choices(builder: string | ChoicesModelSelector | ((selector: ChoicesModelSelector) => ChoicesModelSelector) | undefined, args?: { distinctOn?: ChoicesSelectColumn[], limit?: (number | null), offset?: (number | null), orderBy?: ChoicesOrderBy[], where?: (ChoicesBoolExp | null) }) { return this.__child(`choices`+ (args ? '('+['distinctOn', 'limit', 'offset', 'orderBy', 'where'].map((argName) => ((args as any)[argName] ? `${argName}: ${JSON.stringify((args as any)[argName])}` : null) ).filter((v) => v!=null).join(', ') + ')': ''), ChoicesModelSelector, builder) }
-  choices_aggregate(builder: string | ChoicesAggregateModelSelector | ((selector: ChoicesAggregateModelSelector) => ChoicesAggregateModelSelector) | undefined, args?: { distinctOn?: ChoicesSelectColumn[], limit?: (number | null), offset?: (number | null), orderBy?: ChoicesOrderBy[], where?: (ChoicesBoolExp | null) }) { return this.__child(`choices_aggregate`+ (args ? '('+['distinctOn', 'limit', 'offset', 'orderBy', 'where'].map((argName) => ((args as any)[argName] ? `${argName}: ${JSON.stringify((args as any)[argName])}` : null) ).filter((v) => v!=null).join(', ') + ')': ''), ChoicesAggregateModelSelector, builder) }
-  choices_by_pk(builder: string | ChoicesModelSelector | ((selector: ChoicesModelSelector) => ChoicesModelSelector) | undefined, args: { id: any }) { return this.__child(`choices_by_pk`+ (args ? '('+['id'].map((argName) => ((args as any)[argName] ? `${argName}: ${JSON.stringify((args as any)[argName])}` : null) ).filter((v) => v!=null).join(', ') + ')': ''), ChoicesModelSelector, builder) }
-  polls(builder: string | PollsModelSelector | ((selector: PollsModelSelector) => PollsModelSelector) | undefined, args?: { distinctOn?: PollsSelectColumn[], limit?: (number | null), offset?: (number | null), orderBy?: PollsOrderBy[], where?: (PollsBoolExp | null) }) { return this.__child(`polls`+ (args ? '('+['distinctOn', 'limit', 'offset', 'orderBy', 'where'].map((argName) => ((args as any)[argName] ? `${argName}: ${JSON.stringify((args as any)[argName])}` : null) ).filter((v) => v!=null).join(', ') + ')': ''), PollsModelSelector, builder) }
-  polls_aggregate(builder: string | PollsAggregateModelSelector | ((selector: PollsAggregateModelSelector) => PollsAggregateModelSelector) | undefined, args?: { distinctOn?: PollsSelectColumn[], limit?: (number | null), offset?: (number | null), orderBy?: PollsOrderBy[], where?: (PollsBoolExp | null) }) { return this.__child(`polls_aggregate`+ (args ? '('+['distinctOn', 'limit', 'offset', 'orderBy', 'where'].map((argName) => ((args as any)[argName] ? `${argName}: ${JSON.stringify((args as any)[argName])}` : null) ).filter((v) => v!=null).join(', ') + ')': ''), PollsAggregateModelSelector, builder) }
-  polls_by_pk(builder: string | PollsModelSelector | ((selector: PollsModelSelector) => PollsModelSelector) | undefined, args: { id: any }) { return this.__child(`polls_by_pk`+ (args ? '('+['id'].map((argName) => ((args as any)[argName] ? `${argName}: ${JSON.stringify((args as any)[argName])}` : null) ).filter((v) => v!=null).join(', ') + ')': ''), PollsModelSelector, builder) }
+  choices(builder: string | ChoicesModelSelector | ((selector: ChoicesModelSelector) => ChoicesModelSelector) | undefined = undefined, args?: { distinctOn?: ChoicesSelectColumn[], limit?: (number | null), offset?: (number | null), orderBy?: ChoicesOrderBy[], where?: (ChoicesBoolExp | null) }) { return this.__child(`choices`+ (args ? '('+['distinctOn', 'limit', 'offset', 'orderBy', 'where'].map((argName) => ((args as any)[argName] ? `${argName}: ${JSON.stringify((args as any)[argName])}` : null) ).filter((v) => v!=null).join(', ') + ')': ''), ChoicesModelSelector, builder) }
+  choices_aggregate(builder: string | ChoicesAggregateModelSelector | ((selector: ChoicesAggregateModelSelector) => ChoicesAggregateModelSelector) | undefined = undefined, args?: { distinctOn?: ChoicesSelectColumn[], limit?: (number | null), offset?: (number | null), orderBy?: ChoicesOrderBy[], where?: (ChoicesBoolExp | null) }) { return this.__child(`choices_aggregate`+ (args ? '('+['distinctOn', 'limit', 'offset', 'orderBy', 'where'].map((argName) => ((args as any)[argName] ? `${argName}: ${JSON.stringify((args as any)[argName])}` : null) ).filter((v) => v!=null).join(', ') + ')': ''), ChoicesAggregateModelSelector, builder) }
+  choices_by_pk(builder: string | ChoicesModelSelector | ((selector: ChoicesModelSelector) => ChoicesModelSelector) | undefined = undefined, args: { id: any }) { return this.__child(`choices_by_pk`+ (args ? '('+['id'].map((argName) => ((args as any)[argName] ? `${argName}: ${JSON.stringify((args as any)[argName])}` : null) ).filter((v) => v!=null).join(', ') + ')': ''), ChoicesModelSelector, builder) }
+  polls(builder: string | PollsModelSelector | ((selector: PollsModelSelector) => PollsModelSelector) | undefined = undefined, args?: { distinctOn?: PollsSelectColumn[], limit?: (number | null), offset?: (number | null), orderBy?: PollsOrderBy[], where?: (PollsBoolExp | null) }) { return this.__child(`polls`+ (args ? '('+['distinctOn', 'limit', 'offset', 'orderBy', 'where'].map((argName) => ((args as any)[argName] ? `${argName}: ${JSON.stringify((args as any)[argName])}` : null) ).filter((v) => v!=null).join(', ') + ')': ''), PollsModelSelector, builder) }
+  polls_aggregate(builder: string | PollsAggregateModelSelector | ((selector: PollsAggregateModelSelector) => PollsAggregateModelSelector) | undefined = undefined, args?: { distinctOn?: PollsSelectColumn[], limit?: (number | null), offset?: (number | null), orderBy?: PollsOrderBy[], where?: (PollsBoolExp | null) }) { return this.__child(`polls_aggregate`+ (args ? '('+['distinctOn', 'limit', 'offset', 'orderBy', 'where'].map((argName) => ((args as any)[argName] ? `${argName}: ${JSON.stringify((args as any)[argName])}` : null) ).filter((v) => v!=null).join(', ') + ')': ''), PollsAggregateModelSelector, builder) }
+  polls_by_pk(builder: string | PollsModelSelector | ((selector: PollsModelSelector) => PollsModelSelector) | undefined = undefined, args: { id: any }) { return this.__child(`polls_by_pk`+ (args ? '('+['id'].map((argName) => ((args as any)[argName] ? `${argName}: ${JSON.stringify((args as any)[argName])}` : null) ).filter((v) => v!=null).join(', ') + ')': ''), PollsModelSelector, builder) }
 }
 export function selectFromQueryRoot() {
   return new QueryRootModelSelector()
diff --git a/examples/6-scaffolding-ts-hasura/src/models/SubscriptionRootModel.base.ts b/examples/6-scaffolding-ts-hasura/src/models/SubscriptionRootModel.base.ts
index ee05ecd7..41bbb6af 100644
--- a/examples/6-scaffolding-ts-hasura/src/models/SubscriptionRootModel.base.ts
+++ b/examples/6-scaffolding-ts-hasura/src/models/SubscriptionRootModel.base.ts
@@ -50,12 +50,12 @@ export const SubscriptionRootModelBase = withTypedRefs<Refs>()(ModelBase
   })))
 
 export class SubscriptionRootModelSelector extends QueryBuilder {
-  choices(builder: string | ChoicesModelSelector | ((selector: ChoicesModelSelector) => ChoicesModelSelector) | undefined, args?: { distinctOn?: ChoicesSelectColumn[], limit?: (number | null), offset?: (number | null), orderBy?: ChoicesOrderBy[], where?: (ChoicesBoolExp | null) }) { return this.__child(`choices`+ (args ? '('+['distinctOn', 'limit', 'offset', 'orderBy', 'where'].map((argName) => ((args as any)[argName] ? `${argName}: ${JSON.stringify((args as any)[argName])}` : null) ).filter((v) => v!=null).join(', ') + ')': ''), ChoicesModelSelector, builder) }
-  choices_aggregate(builder: string | ChoicesAggregateModelSelector | ((selector: ChoicesAggregateModelSelector) => ChoicesAggregateModelSelector) | undefined, args?: { distinctOn?: ChoicesSelectColumn[], limit?: (number | null), offset?: (number | null), orderBy?: ChoicesOrderBy[], where?: (ChoicesBoolExp | null) }) { return this.__child(`choices_aggregate`+ (args ? '('+['distinctOn', 'limit', 'offset', 'orderBy', 'where'].map((argName) => ((args as any)[argName] ? `${argName}: ${JSON.stringify((args as any)[argName])}` : null) ).filter((v) => v!=null).join(', ') + ')': ''), ChoicesAggregateModelSelector, builder) }
-  choices_by_pk(builder: string | ChoicesModelSelector | ((selector: ChoicesModelSelector) => ChoicesModelSelector) | undefined, args: { id: any }) { return this.__child(`choices_by_pk`+ (args ? '('+['id'].map((argName) => ((args as any)[argName] ? `${argName}: ${JSON.stringify((args as any)[argName])}` : null) ).filter((v) => v!=null).join(', ') + ')': ''), ChoicesModelSelector, builder) }
-  polls(builder: string | PollsModelSelector | ((selector: PollsModelSelector) => PollsModelSelector) | undefined, args?: { distinctOn?: PollsSelectColumn[], limit?: (number | null), offset?: (number | null), orderBy?: PollsOrderBy[], where?: (PollsBoolExp | null) }) { return this.__child(`polls`+ (args ? '('+['distinctOn', 'limit', 'offset', 'orderBy', 'where'].map((argName) => ((args as any)[argName] ? `${argName}: ${JSON.stringify((args as any)[argName])}` : null) ).filter((v) => v!=null).join(', ') + ')': ''), PollsModelSelector, builder) }
-  polls_aggregate(builder: string | PollsAggregateModelSelector | ((selector: PollsAggregateModelSelector) => PollsAggregateModelSelector) | undefined, args?: { distinctOn?: PollsSelectColumn[], limit?: (number | null), offset?: (number | null), orderBy?: PollsOrderBy[], where?: (PollsBoolExp | null) }) { return this.__child(`polls_aggregate`+ (args ? '('+['distinctOn', 'limit', 'offset', 'orderBy', 'where'].map((argName) => ((args as any)[argName] ? `${argName}: ${JSON.stringify((args as any)[argName])}` : null) ).filter((v) => v!=null).join(', ') + ')': ''), PollsAggregateModelSelector, builder) }
-  polls_by_pk(builder: string | PollsModelSelector | ((selector: PollsModelSelector) => PollsModelSelector) | undefined, args: { id: any }) { return this.__child(`polls_by_pk`+ (args ? '('+['id'].map((argName) => ((args as any)[argName] ? `${argName}: ${JSON.stringify((args as any)[argName])}` : null) ).filter((v) => v!=null).join(', ') + ')': ''), PollsModelSelector, builder) }
+  choices(builder: string | ChoicesModelSelector | ((selector: ChoicesModelSelector) => ChoicesModelSelector) | undefined = undefined, args?: { distinctOn?: ChoicesSelectColumn[], limit?: (number | null), offset?: (number | null), orderBy?: ChoicesOrderBy[], where?: (ChoicesBoolExp | null) }) { return this.__child(`choices`+ (args ? '('+['distinctOn', 'limit', 'offset', 'orderBy', 'where'].map((argName) => ((args as any)[argName] ? `${argName}: ${JSON.stringify((args as any)[argName])}` : null) ).filter((v) => v!=null).join(', ') + ')': ''), ChoicesModelSelector, builder) }
+  choices_aggregate(builder: string | ChoicesAggregateModelSelector | ((selector: ChoicesAggregateModelSelector) => ChoicesAggregateModelSelector) | undefined = undefined, args?: { distinctOn?: ChoicesSelectColumn[], limit?: (number | null), offset?: (number | null), orderBy?: ChoicesOrderBy[], where?: (ChoicesBoolExp | null) }) { return this.__child(`choices_aggregate`+ (args ? '('+['distinctOn', 'limit', 'offset', 'orderBy', 'where'].map((argName) => ((args as any)[argName] ? `${argName}: ${JSON.stringify((args as any)[argName])}` : null) ).filter((v) => v!=null).join(', ') + ')': ''), ChoicesAggregateModelSelector, builder) }
+  choices_by_pk(builder: string | ChoicesModelSelector | ((selector: ChoicesModelSelector) => ChoicesModelSelector) | undefined = undefined, args: { id: any }) { return this.__child(`choices_by_pk`+ (args ? '('+['id'].map((argName) => ((args as any)[argName] ? `${argName}: ${JSON.stringify((args as any)[argName])}` : null) ).filter((v) => v!=null).join(', ') + ')': ''), ChoicesModelSelector, builder) }
+  polls(builder: string | PollsModelSelector | ((selector: PollsModelSelector) => PollsModelSelector) | undefined = undefined, args?: { distinctOn?: PollsSelectColumn[], limit?: (number | null), offset?: (number | null), orderBy?: PollsOrderBy[], where?: (PollsBoolExp | null) }) { return this.__child(`polls`+ (args ? '('+['distinctOn', 'limit', 'offset', 'orderBy', 'where'].map((argName) => ((args as any)[argName] ? `${argName}: ${JSON.stringify((args as any)[argName])}` : null) ).filter((v) => v!=null).join(', ') + ')': ''), PollsModelSelector, builder) }
+  polls_aggregate(builder: string | PollsAggregateModelSelector | ((selector: PollsAggregateModelSelector) => PollsAggregateModelSelector) | undefined = undefined, args?: { distinctOn?: PollsSelectColumn[], limit?: (number | null), offset?: (number | null), orderBy?: PollsOrderBy[], where?: (PollsBoolExp | null) }) { return this.__child(`polls_aggregate`+ (args ? '('+['distinctOn', 'limit', 'offset', 'orderBy', 'where'].map((argName) => ((args as any)[argName] ? `${argName}: ${JSON.stringify((args as any)[argName])}` : null) ).filter((v) => v!=null).join(', ') + ')': ''), PollsAggregateModelSelector, builder) }
+  polls_by_pk(builder: string | PollsModelSelector | ((selector: PollsModelSelector) => PollsModelSelector) | undefined = undefined, args: { id: any }) { return this.__child(`polls_by_pk`+ (args ? '('+['id'].map((argName) => ((args as any)[argName] ? `${argName}: ${JSON.stringify((args as any)[argName])}` : null) ).filter((v) => v!=null).join(', ') + ')': ''), PollsModelSelector, builder) }
 }
 export function selectFromSubscriptionRoot() {
   return new SubscriptionRootModelSelector()
diff --git a/generator/generate.js b/generator/generate.js
index 064b97e5..bec067f9 100644
--- a/generator/generate.js
+++ b/generator/generate.js
@@ -590,7 +590,7 @@ ${generateFragments(name, primitiveFields, nonPrimitiveFields)}
         const selector = `${fieldName}ModelSelector`
         let p = `  ${field}(builder`
         p += ifTS(
-          `: string | ${selector} | ((selector: ${selector}) => ${selector}) | undefined`
+          `: string | ${selector} | ((selector: ${selector}) => ${selector}) | undefined = undefined`
         )
         if (fieldArgs && fieldArgs.length) {
           const required = fieldArgs.find(
diff --git a/tests/generator/__snapshots__/generate.test.js.snap b/tests/generator/__snapshots__/generate.test.js.snap
index a7fb6777..82801cbb 100644
--- a/tests/generator/__snapshots__/generate.test.js.snap
+++ b/tests/generator/__snapshots__/generate.test.js.snap
@@ -225,7 +225,7 @@ export class MyUserModelSelector extends QueryBuilder {
   get id() { return this.__attr(\`id\`) }
   get name() { return this.__attr(\`name\`) }
   get avatar() { return this.__attr(\`avatar\`) }
-  emptyBoxes(builder: string | PossiblyEmptyBoxModelSelector | ((selector: PossiblyEmptyBoxModelSelector) => PossiblyEmptyBoxModelSelector) | undefined) { return this.__child(\`emptyBoxes\`, PossiblyEmptyBoxModelSelector, builder) }
+  emptyBoxes(builder: string | PossiblyEmptyBoxModelSelector | ((selector: PossiblyEmptyBoxModelSelector) => PossiblyEmptyBoxModelSelector) | undefined = undefined) { return this.__child(\`emptyBoxes\`, PossiblyEmptyBoxModelSelector, builder) }
 }
 export function selectFromMyUser() {
   return new MyUserModelSelector()
@@ -362,7 +362,7 @@ export const QueryRootModelBase = withTypedRefs<Refs>()(ModelBase
   })))
 
 export class QueryRootModelSelector extends QueryBuilder {
-  me(builder: string | MyUserModelSelector | ((selector: MyUserModelSelector) => MyUserModelSelector) | undefined) { return this.__child(\`me\`, MyUserModelSelector, builder) }
+  me(builder: string | MyUserModelSelector | ((selector: MyUserModelSelector) => MyUserModelSelector) | undefined = undefined) { return this.__child(\`me\`, MyUserModelSelector, builder) }
 }
 export function selectFromQueryRoot() {
   return new QueryRootModelSelector()
@@ -1357,7 +1357,7 @@ export const RepoModelBase = ModelBase
 
 export class RepoModelSelector extends QueryBuilder {
   get id() { return this.__attr(\`id\`) }
-  owner(builder: string | OwnerModelSelector | ((selector: OwnerModelSelector) => OwnerModelSelector) | undefined) { return this.__child(\`owner\`, OwnerModelSelector, builder) }
+  owner(builder: string | OwnerModelSelector | ((selector: OwnerModelSelector) => OwnerModelSelector) | undefined = undefined) { return this.__child(\`owner\`, OwnerModelSelector, builder) }
 }
 export function selectFromRepo() {
   return new RepoModelSelector()
@@ -3228,7 +3228,7 @@ export const SearchResultModelBase = ModelBase
 
 export class SearchResultModelSelector extends QueryBuilder {
   get inputQuery() { return this.__attr(\`inputQuery\`) }
-  items(builder: string | SearchItemModelSelector | ((selector: SearchItemModelSelector) => SearchItemModelSelector) | undefined) { return this.__child(\`items\`, SearchItemModelSelector, builder) }
+  items(builder: string | SearchItemModelSelector | ((selector: SearchItemModelSelector) => SearchItemModelSelector) | undefined = undefined) { return this.__child(\`items\`, SearchItemModelSelector, builder) }
 }
 export function selectFromSearchResult() {
   return new SearchResultModelSelector()