diff --git a/modules/openapi-generator/src/main/resources/go-server/model.mustache b/modules/openapi-generator/src/main/resources/go-server/model.mustache
index 6ef715feb3a2..e94a8b9a2dd8 100644
--- a/modules/openapi-generator/src/main/resources/go-server/model.mustache
+++ b/modules/openapi-generator/src/main/resources/go-server/model.mustache
@@ -174,6 +174,61 @@ func Assert{{classname}}Constraints(obj {{classname}}) error {
 		return &ParsingError{Param: "{{name}}", Err: errors.New(errMsgMaxValueConstraint)}
 	}
 {{/maximum}}
+{{#isNullable}}
+{{#isModel}}
+    if obj.{{name}} != nil {
+{{/isModel}}
+{{#isArray}}
+{{#items.isModel}}
+    if obj.{{name}} != nil {
+{{/items.isModel}}
+{{/isArray}}
+{{/isNullable}}
+{{#isModel}}
+{{#isNullable}}     {{/isNullable}}	if err := Assert{{baseType}}Constraints({{#isNullable}}*{{/isNullable}}obj.{{name}}); err != nil {
+{{#isNullable}}     {{/isNullable}}		return err
+{{#isNullable}}     {{/isNullable}}	}
+{{/isModel}}
+{{#isArray}}
+{{#items.isModel}}
+{{#isNullable}}     {{/isNullable}}	for _, el := range {{#isNullable}}*{{/isNullable}}obj.{{name}} {
+{{#isNullable}}     {{/isNullable}}		if err := Assert{{items.baseType}}Constraints(el); err != nil {
+{{#isNullable}}     {{/isNullable}}			return err
+{{#isNullable}}     {{/isNullable}}		}
+{{#isNullable}}     {{/isNullable}}	}
+{{/items.isModel}}
+{{^items.isModel}}
+{{#mostInnerItems.isModel}}
+{{^mostInnerItems.isPrimitiveType}}
+{{#isNullable}}
+    if obj.{{name}} != nil {
+{{/isNullable}}
+{{#isNullable}}     {{/isNullable}}	if err := AssertRecurseInterfaceRequired({{#isNullable}}*{{/isNullable}}obj.{{name}}, Assert{{mostInnerItems.dataType}}Constraints); err != nil {
+{{#isNullable}}     {{/isNullable}}		return err
+{{#isNullable}}     {{/isNullable}}	}
+{{/mostInnerItems.isPrimitiveType}}
+{{/mostInnerItems.isModel}}
+{{/items.isModel}}
+{{/isArray}}
+{{#isNullable}}
+{{#isModel}}
+    }
+{{/isModel}}
+{{#isArray}}
+{{#items.isModel}}
+    }
+{{/items.isModel}}
+{{^items.isModel}}
+{{#mostInnerItems.isModel}}
+{{^mostInnerItems.isPrimitiveType}}
+{{#isNullable}}
+    }
+{{/isNullable}}
+{{/mostInnerItems.isPrimitiveType}}
+{{/mostInnerItems.isModel}}
+{{/items.isModel}}
+{{/isArray}}
+{{/isNullable}}
 {{/Vars}}
 	return nil
 }{{/model}}{{/models}}
diff --git a/samples/openapi3/server/petstore/go/go-petstore/go/model_an_object.go b/samples/openapi3/server/petstore/go/go-petstore/go/model_an_object.go
index e5bdcff24953..b5b8e6c5276f 100644
--- a/samples/openapi3/server/petstore/go/go-petstore/go/model_an_object.go
+++ b/samples/openapi3/server/petstore/go/go-petstore/go/model_an_object.go
@@ -37,5 +37,13 @@ func AssertAnObjectRequired(obj AnObject) error {
 
 // AssertAnObjectConstraints checks if the values respects the defined constraints
 func AssertAnObjectConstraints(obj AnObject) error {
+	if err := AssertTagConstraints(obj.Tag); err != nil {
+		return err
+	}
+	for _, el := range obj.Pet {
+		if err := AssertPetConstraints(el); err != nil {
+			return err
+		}
+	}
 	return nil
 }
diff --git a/samples/openapi3/server/petstore/go/go-petstore/go/model_pet.go b/samples/openapi3/server/petstore/go/go-petstore/go/model_pet.go
index 48537769fb05..38a5af1d3935 100644
--- a/samples/openapi3/server/petstore/go/go-petstore/go/model_pet.go
+++ b/samples/openapi3/server/petstore/go/go-petstore/go/model_pet.go
@@ -60,5 +60,17 @@ func AssertPetRequired(obj Pet) error {
 
 // AssertPetConstraints checks if the values respects the defined constraints
 func AssertPetConstraints(obj Pet) error {
+    if obj.Category != nil {
+     	if err := AssertCategoryConstraints(*obj.Category); err != nil {
+     		return err
+     	}
+    }
+    if obj.Tags != nil {
+     	for _, el := range *obj.Tags {
+     		if err := AssertTagConstraints(el); err != nil {
+     			return err
+     		}
+     	}
+    }
 	return nil
 }
diff --git a/samples/openapi3/server/petstore/go/go-petstore/go/model_user.go b/samples/openapi3/server/petstore/go/go-petstore/go/model_user.go
index 973b8986d38e..29803083edbf 100644
--- a/samples/openapi3/server/petstore/go/go-petstore/go/model_user.go
+++ b/samples/openapi3/server/petstore/go/go-petstore/go/model_user.go
@@ -64,5 +64,13 @@ func AssertUserRequired(obj User) error {
 
 // AssertUserConstraints checks if the values respects the defined constraints
 func AssertUserConstraints(obj User) error {
+    if obj.DeepSliceModel != nil {
+     	if err := AssertRecurseInterfaceRequired(*obj.DeepSliceModel, AssertTagConstraints); err != nil {
+     		return err
+     	}
+    }
+	if err := AssertRecurseInterfaceRequired(obj.DeepSliceMap, AssertAnObjectConstraints); err != nil {
+		return err
+	}
 	return nil
 }
diff --git a/samples/server/petstore/go-api-server/go/model_an_object.go b/samples/server/petstore/go-api-server/go/model_an_object.go
index e5bdcff24953..b5b8e6c5276f 100644
--- a/samples/server/petstore/go-api-server/go/model_an_object.go
+++ b/samples/server/petstore/go-api-server/go/model_an_object.go
@@ -37,5 +37,13 @@ func AssertAnObjectRequired(obj AnObject) error {
 
 // AssertAnObjectConstraints checks if the values respects the defined constraints
 func AssertAnObjectConstraints(obj AnObject) error {
+	if err := AssertTagConstraints(obj.Tag); err != nil {
+		return err
+	}
+	for _, el := range obj.Pet {
+		if err := AssertPetConstraints(el); err != nil {
+			return err
+		}
+	}
 	return nil
 }
diff --git a/samples/server/petstore/go-api-server/go/model_pet.go b/samples/server/petstore/go-api-server/go/model_pet.go
index 48537769fb05..38a5af1d3935 100644
--- a/samples/server/petstore/go-api-server/go/model_pet.go
+++ b/samples/server/petstore/go-api-server/go/model_pet.go
@@ -60,5 +60,17 @@ func AssertPetRequired(obj Pet) error {
 
 // AssertPetConstraints checks if the values respects the defined constraints
 func AssertPetConstraints(obj Pet) error {
+    if obj.Category != nil {
+     	if err := AssertCategoryConstraints(*obj.Category); err != nil {
+     		return err
+     	}
+    }
+    if obj.Tags != nil {
+     	for _, el := range *obj.Tags {
+     		if err := AssertTagConstraints(el); err != nil {
+     			return err
+     		}
+     	}
+    }
 	return nil
 }
diff --git a/samples/server/petstore/go-api-server/go/model_user.go b/samples/server/petstore/go-api-server/go/model_user.go
index 973b8986d38e..29803083edbf 100644
--- a/samples/server/petstore/go-api-server/go/model_user.go
+++ b/samples/server/petstore/go-api-server/go/model_user.go
@@ -64,5 +64,13 @@ func AssertUserRequired(obj User) error {
 
 // AssertUserConstraints checks if the values respects the defined constraints
 func AssertUserConstraints(obj User) error {
+    if obj.DeepSliceModel != nil {
+     	if err := AssertRecurseInterfaceRequired(*obj.DeepSliceModel, AssertTagConstraints); err != nil {
+     		return err
+     	}
+    }
+	if err := AssertRecurseInterfaceRequired(obj.DeepSliceMap, AssertAnObjectConstraints); err != nil {
+		return err
+	}
 	return nil
 }
diff --git a/samples/server/petstore/go-chi-server/go/model_an_object.go b/samples/server/petstore/go-chi-server/go/model_an_object.go
index e5bdcff24953..b5b8e6c5276f 100644
--- a/samples/server/petstore/go-chi-server/go/model_an_object.go
+++ b/samples/server/petstore/go-chi-server/go/model_an_object.go
@@ -37,5 +37,13 @@ func AssertAnObjectRequired(obj AnObject) error {
 
 // AssertAnObjectConstraints checks if the values respects the defined constraints
 func AssertAnObjectConstraints(obj AnObject) error {
+	if err := AssertTagConstraints(obj.Tag); err != nil {
+		return err
+	}
+	for _, el := range obj.Pet {
+		if err := AssertPetConstraints(el); err != nil {
+			return err
+		}
+	}
 	return nil
 }
diff --git a/samples/server/petstore/go-chi-server/go/model_pet.go b/samples/server/petstore/go-chi-server/go/model_pet.go
index 48537769fb05..38a5af1d3935 100644
--- a/samples/server/petstore/go-chi-server/go/model_pet.go
+++ b/samples/server/petstore/go-chi-server/go/model_pet.go
@@ -60,5 +60,17 @@ func AssertPetRequired(obj Pet) error {
 
 // AssertPetConstraints checks if the values respects the defined constraints
 func AssertPetConstraints(obj Pet) error {
+    if obj.Category != nil {
+     	if err := AssertCategoryConstraints(*obj.Category); err != nil {
+     		return err
+     	}
+    }
+    if obj.Tags != nil {
+     	for _, el := range *obj.Tags {
+     		if err := AssertTagConstraints(el); err != nil {
+     			return err
+     		}
+     	}
+    }
 	return nil
 }
diff --git a/samples/server/petstore/go-chi-server/go/model_user.go b/samples/server/petstore/go-chi-server/go/model_user.go
index 973b8986d38e..29803083edbf 100644
--- a/samples/server/petstore/go-chi-server/go/model_user.go
+++ b/samples/server/petstore/go-chi-server/go/model_user.go
@@ -64,5 +64,13 @@ func AssertUserRequired(obj User) error {
 
 // AssertUserConstraints checks if the values respects the defined constraints
 func AssertUserConstraints(obj User) error {
+    if obj.DeepSliceModel != nil {
+     	if err := AssertRecurseInterfaceRequired(*obj.DeepSliceModel, AssertTagConstraints); err != nil {
+     		return err
+     	}
+    }
+	if err := AssertRecurseInterfaceRequired(obj.DeepSliceMap, AssertAnObjectConstraints); err != nil {
+		return err
+	}
 	return nil
 }