Fix nullable UUID type mismatch in Go code generator (#4172)

* Fix nullable UUID type mismatch in Go code generator

Nullable UUID fields (format: uuid, nullable: true) were being mapped to
NullableString, causing getter/setter methods to return *string while
the method signatures expected uuid.UUID — a compile error.

Add a dedicated NullableUUID type to utils.j2 and update formatter.py
to use it for nullable uuid fields instead of NullableString.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

* pre-commit fixes

---------

Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>
Co-authored-by: ci.datadog-api-spec <packages@datadoghq.com>

Author: 3 people

.generator/src/generator/formatter.py

@@ -155,7 +155,7 @@ def simple_type(schema, render_nullable=False, render_new=False):
             "date": "time.Time" if not nullable else f"{nullable_prefix}Time",
             "date-time": "time.Time" if not nullable else f"{nullable_prefix}Time",
             "binary": "_io.Reader",
-            "uuid": "uuid.UUID" if not nullable else f"{nullable_prefix}String",
+            "uuid": "uuid.UUID" if not nullable else f"{nullable_prefix}UUID",
         }.get(type_format, "string" if not nullable else f"{nullable_prefix}String")
     if type_name == "boolean":
         return "bool" if not nullable else f"{nullable_prefix}Bool"

.generator/src/generator/templates/utils.j2

@@ -39,6 +39,50 @@ func PtrTime(v time.Time) *time.Time { return &v }
 // PtrUUID is helper routine that returns a pointer to given UUID value.
 func PtrUUID(v uuid.UUID) *uuid.UUID { return &v }
 
+// NullableUUID is a struct to hold a nullable UUID value.
+type NullableUUID struct {
+	value *uuid.UUID
+	isSet bool
+}
+
+// Get returns the value associated with the nullable UUID.
+func (v NullableUUID) Get() *uuid.UUID {
+	return v.value
+}
+
+// Set sets the value associated with the nullable UUID.
+func (v *NullableUUID) Set(val *uuid.UUID) {
+	v.value = val
+	v.isSet = true
+}
+
+// IsSet returns true if the value has been set.
+func (v NullableUUID) IsSet() bool {
+	return v.isSet
+}
+
+// Unset resets fields of the nullable UUID.
+func (v *NullableUUID) Unset() {
+	v.value = nil
+	v.isSet = false
+}
+
+// NewNullableUUID instantiates a new nullable UUID.
+func NewNullableUUID(val *uuid.UUID) *NullableUUID {
+	return &NullableUUID{value: val, isSet: true}
+}
+
+// MarshalJSON serializes the associated value.
+func (v NullableUUID) MarshalJSON() ([]byte, error) {
+	return Marshal(v.value)
+}
+
+// UnmarshalJSON deserializes to the associated value.
+func (v *NullableUUID) UnmarshalJSON(src []byte) error {
+	v.isSet = true
+	return Unmarshal(src, &v.value)
+}
+
 // PaginationResult pagination item helper struct
 type PaginationResult[T any] struct {
 	Item T

api/datadog/utils.go

@@ -43,6 +43,50 @@ func PtrTime(v time.Time) *time.Time { return &v }
 // PtrUUID is helper routine that returns a pointer to given UUID value.
 func PtrUUID(v uuid.UUID) *uuid.UUID { return &v }
 
+// NullableUUID is a struct to hold a nullable UUID value.
+type NullableUUID struct {
+	value *uuid.UUID
+	isSet bool
+}
+
+// Get returns the value associated with the nullable UUID.
+func (v NullableUUID) Get() *uuid.UUID {
+	return v.value
+}
+
+// Set sets the value associated with the nullable UUID.
+func (v *NullableUUID) Set(val *uuid.UUID) {
+	v.value = val
+	v.isSet = true
+}
+
+// IsSet returns true if the value has been set.
+func (v NullableUUID) IsSet() bool {
+	return v.isSet
+}
+
+// Unset resets fields of the nullable UUID.
+func (v *NullableUUID) Unset() {
+	v.value = nil
+	v.isSet = false
+}
+
+// NewNullableUUID instantiates a new nullable UUID.
+func NewNullableUUID(val *uuid.UUID) *NullableUUID {
+	return &NullableUUID{value: val, isSet: true}
+}
+
+// MarshalJSON serializes the associated value.
+func (v NullableUUID) MarshalJSON() ([]byte, error) {
+	return Marshal(v.value)
+}
+
+// UnmarshalJSON deserializes to the associated value.
+func (v *NullableUUID) UnmarshalJSON(src []byte) error {
+	v.isSet = true
+	return Unmarshal(src, &v.value)
+}
+
 // PaginationResult pagination item helper struct
 type PaginationResult[T any] struct {
 	Item  T