feat: Add --use-status-code-in-response-name option

docs/cli-reference/index.md

@@ -13,7 +13,7 @@ This documentation is auto-generated from test cases.
 | 🏷️ [Field Customization](field-customization.md) | 20 | Field naming and docstring behavior |
 | 🏗️ [Model Customization](model-customization.md) | 26 | Model generation behavior |
 | 🎨 [Template Customization](template-customization.md) | 16 | Output formatting and custom rendering |
-| 📘 [OpenAPI-only Options](openapi-only-options.md) | 5 | OpenAPI-specific features |
+| 📘 [OpenAPI-only Options](openapi-only-options.md) | 6 | OpenAPI-specific features |
 | ⚙️ [General Options](general-options.md) | 14 | Utilities and meta options |
 | 📝 [Utility Options](utility-options.md) | 5 | Help, version, debug options |
 
@@ -172,6 +172,7 @@ This documentation is auto-generated from test cases.
 - [`--use-schema-description`](field-customization.md#use-schema-description)
 - [`--use-serialize-as-any`](model-customization.md#use-serialize-as-any)
 - [`--use-standard-collections`](typing-customization.md#use-standard-collections)
+- [`--use-status-code-in-response-name`](openapi-only-options.md#use-status-code-in-response-name)
 - [`--use-subclass-enum`](model-customization.md#use-subclass-enum)
 - [`--use-title-as-name`](field-customization.md#use-title-as-name)
 - [`--use-type-alias`](typing-customization.md#use-type-alias)

docs/cli-reference/openapi-only-options.md

@@ -8,6 +8,7 @@
 | [`--openapi-scopes`](#openapi-scopes) | Specify OpenAPI scopes to generate (schemas, paths, paramete... |
 | [`--read-only-write-only-model-type`](#read-only-write-only-model-type) | Generate separate request and response models for readOnly/w... |
 | [`--use-operation-id-as-name`](#use-operation-id-as-name) | Use OpenAPI operationId as the generated function/class name... |
+| [`--use-status-code-in-response-name`](#use-status-code-in-response-name) | Include HTTP status code in response model names. |
 | [`--validation`](#validation) | Enable validation constraints (deprecated, use --field-const... |
 
 ---
@@ -926,6 +927,98 @@ The `--use-operation-id-as-name` flag configures the code generation behavior.
 
 ---
 
+## `--use-status-code-in-response-name` {#use-status-code-in-response-name}
+
+Include HTTP status code in response model names.
+
+The `--use-status-code-in-response-name` flag includes the HTTP status code
+in generated response model class names. Instead of generating ambiguous names
+like ResourceGetResponse, ResourceGetResponse1, ResourceGetResponse2, it generates
+clear names like ResourceGetResponse200, ResourceGetResponse400, ResourceGetResponseDefault.
+
+!!! tip "Usage"
+
+    ```bash
+    datamodel-codegen --input schema.json --use-status-code-in-response-name --openapi-scopes schemas paths # (1)!
+    ```
+
+    1. :material-arrow-left: `--use-status-code-in-response-name` - the option documented here
+
+??? example "Input Schema"
+
+    ```yaml
+    openapi: "3.0.0"
+    info:
+      version: 1.0.0
+      title: Status Code Response Name Test API
+    paths:
+      /resource:
+        get:
+          summary: Get a resource
+          responses:
+            '200':
+              description: Successful response
+              content:
+                application/json:
+                  schema:
+                    type: object
+                    properties:
+                      id:
+                        type: integer
+                      name:
+                        type: string
+            '400':
+              description: Bad request error
+              content:
+                application/json:
+                  schema:
+                    type: object
+                    properties:
+                      error:
+                        type: string
+                      code:
+                        type: integer
+            'default':
+              description: Unexpected error
+              content:
+                application/json:
+                  schema:
+                    type: object
+                    properties:
+                      message:
+                        type: string
+    ```
+
+??? example "Output"
+
+    ```python
+    # generated by datamodel-codegen:
+    #   filename:  use_status_code_in_response_name.yaml
+    #   timestamp: 2019-07-26T00:00:00+00:00
+
+    from __future__ import annotations
+
+    from typing import Optional
+
+    from pydantic import BaseModel
+
+
+    class ResourceGetResponse200(BaseModel):
+        id: Optional[int] = None
+        name: Optional[str] = None
+
+
+    class ResourceGetResponse400(BaseModel):
+        error: Optional[str] = None
+        code: Optional[int] = None
+
+
+    class ResourceGetResponseDefault(BaseModel):
+        message: Optional[str] = None
+    ```
+
+---
+
 ## `--validation` {#validation}
 
 Enable validation constraints (deprecated, use --field-constraints).

docs/cli-reference/quick-reference.md

@@ -128,6 +128,7 @@ datamodel-codegen [OPTIONS]
 | [`--openapi-scopes`](openapi-only-options.md#openapi-scopes) | Specify OpenAPI scopes to generate (schemas, paths, parameters). |
 | [`--read-only-write-only-model-type`](openapi-only-options.md#read-only-write-only-model-type) | Generate separate request and response models for readOnly/writeOnly fields. |
 | [`--use-operation-id-as-name`](openapi-only-options.md#use-operation-id-as-name) | Use OpenAPI operationId as the generated function/class name. |
+| [`--use-status-code-in-response-name`](openapi-only-options.md#use-status-code-in-response-name) | Include HTTP status code in response model names. |
 | [`--validation`](openapi-only-options.md#validation) | Enable validation constraints (deprecated, use --field-constraints). |
 
 ### ⚙️ General Options
@@ -262,6 +263,7 @@ All options sorted alphabetically:
 - [`--use-schema-description`](field-customization.md#use-schema-description) - Use schema description as class docstring.
 - [`--use-serialize-as-any`](model-customization.md#use-serialize-as-any) - Wrap fields with subtypes in Pydantic's SerializeAsAny.
 - [`--use-standard-collections`](typing-customization.md#use-standard-collections) - Use built-in dict/list instead of typing.Dict/List.
+- [`--use-status-code-in-response-name`](openapi-only-options.md#use-status-code-in-response-name) - Include HTTP status code in response model names.
 - [`--use-subclass-enum`](model-customization.md#use-subclass-enum) - Generate typed Enum subclasses for enums with specific field...
 - [`--use-title-as-name`](field-customization.md#use-title-as-name) - Use schema title as the generated class name.
 - [`--use-type-alias`](typing-customization.md#use-type-alias) - Use TypeAlias instead of root models for type definitions (e...

src/datamodel_code_generator/__init__.py

@@ -477,6 +477,7 @@ def generate(  # noqa: PLR0912, PLR0913, PLR0914, PLR0915
     disable_future_imports: bool = False,
     type_mappings: list[str] | None = None,
     read_only_write_only_model_type: ReadOnlyWriteOnlyModelType | None = None,
+    use_status_code_in_response_name: bool = False,
     all_exports_scope: AllExportsScope | None = None,
     all_exports_collision_strategy: AllExportsCollisionStrategy | None = None,
     module_split_mode: ModuleSplitMode | None = None,
@@ -536,6 +537,7 @@ def generate(  # noqa: PLR0912, PLR0913, PLR0914, PLR0915
         parser_class: type[Parser] = OpenAPIParser
         kwargs["openapi_scopes"] = openapi_scopes
         kwargs["include_path_parameters"] = include_path_parameters
+        kwargs["use_status_code_in_response_name"] = use_status_code_in_response_name
     elif input_file_type == InputFileType.GraphQL:
         from datamodel_code_generator.parser.graphql import GraphQLParser  # noqa: PLC0415
 

src/datamodel_code_generator/__main__.py

@@ -463,6 +463,7 @@ def validate_all_exports_collision_strategy(cls, values: dict[str, Any]) -> dict
     disable_future_imports: bool = False
     type_mappings: Optional[list[str]] = None  # noqa: UP045
     read_only_write_only_model_type: Optional[ReadOnlyWriteOnlyModelType] = None  # noqa: UP045
+    use_status_code_in_response_name: bool = False
     all_exports_scope: Optional[AllExportsScope] = None  # noqa: UP045
     all_exports_collision_strategy: Optional[AllExportsCollisionStrategy] = None  # noqa: UP045
     module_split_mode: Optional[ModuleSplitMode] = None  # noqa: UP045
@@ -765,6 +766,7 @@ def run_generate_from_config(  # noqa: PLR0913, PLR0917
         disable_future_imports=config.disable_future_imports,
         type_mappings=config.type_mappings,
         read_only_write_only_model_type=config.read_only_write_only_model_type,
+        use_status_code_in_response_name=config.use_status_code_in_response_name,
         all_exports_scope=config.all_exports_scope,
         all_exports_collision_strategy=config.all_exports_collision_strategy,
         module_split_mode=config.module_split_mode,

src/datamodel_code_generator/arguments.py

@@ -713,6 +713,12 @@ def start_section(self, heading: str | None) -> None:
     choices=[e.value for e in ReadOnlyWriteOnlyModelType],
     default=None,
 )
+openapi_options.add_argument(
+    "--use-status-code-in-response-name",
+    help="Include HTTP status code in response model names (e.g., ResourceGetResponse200, ResourceGetResponseDefault)",
+    action="store_true",
+    default=None,
+)
 
 # ======================================================================================
 # General options

src/datamodel_code_generator/cli_options.py

@@ -181,6 +181,9 @@ class CLIOptionMeta:
     # ==========================================================================
     "--openapi-scopes": CLIOptionMeta(name="--openapi-scopes", category=OptionCategory.OPENAPI),
     "--use-operation-id-as-name": CLIOptionMeta(name="--use-operation-id-as-name", category=OptionCategory.OPENAPI),
+    "--use-status-code-in-response-name": CLIOptionMeta(
+        name="--use-status-code-in-response-name", category=OptionCategory.OPENAPI
+    ),
     "--read-only-write-only-model-type": CLIOptionMeta(
         name="--read-only-write-only-model-type", category=OptionCategory.OPENAPI
     ),

src/datamodel_code_generator/parser/openapi.py

@@ -272,6 +272,7 @@ def __init__(  # noqa: PLR0913
         type_mappings: list[str] | None = None,
         read_only_write_only_model_type: ReadOnlyWriteOnlyModelType | None = None,
         use_frozen_field: bool = False,
+        use_status_code_in_response_name: bool = False,
     ) -> None:
         """Initialize the OpenAPI parser with extensive configuration options."""
         target_datetime_class = target_datetime_class or DatetimeClassType.Awaredatetime
@@ -369,6 +370,7 @@ def __init__(  # noqa: PLR0913
         )
         self.open_api_scopes: list[OpenAPIScope] = openapi_scopes or [OpenAPIScope.Schemas]
         self.include_path_parameters: bool = include_path_parameters
+        self.use_status_code_in_response_name: bool = use_status_code_in_response_name
         self._discriminator_schemas: dict[str, dict[str, Any]] = {}
         self._discriminator_subtypes: dict[str, list[str]] = defaultdict(list)
 
@@ -550,6 +552,8 @@ def parse_responses(
         """Parse response objects into data types by status code and content type."""
         data_types: defaultdict[str | int, dict[str, DataType]] = defaultdict(dict)
         for status_code, detail in responses.items():
+            response_name = f"{name}{str(status_code).capitalize()}" if self.use_status_code_in_response_name else name
+
             if isinstance(detail, ReferenceObject):
                 if not detail.ref:  # pragma: no cover
                     continue
@@ -563,7 +567,7 @@ def parse_responses(
 
             for content_type, obj in content.items():
                 response_path: list[str] = [*path, str(status_code), str(content_type)]
-                data_type = self._parse_schema_or_ref(name, obj.schema_, response_path)
+                data_type = self._parse_schema_or_ref(response_name, obj.schema_, response_path)
                 if data_type:
                     data_types[status_code][content_type] = data_type  # pyright: ignore[reportArgumentType]
 

tests/data/expected/main/openapi/use_status_code_in_response_name.py

@@ -0,0 +1,23 @@
+# generated by datamodel-codegen:
+#   filename:  use_status_code_in_response_name.yaml
+#   timestamp: 2019-07-26T00:00:00+00:00
+
+from __future__ import annotations
+
+from typing import Optional
+
+from pydantic import BaseModel
+
+
+class ResourceGetResponse200(BaseModel):
+    id: Optional[int] = None
+    name: Optional[str] = None
+
+
+class ResourceGetResponse400(BaseModel):
+    error: Optional[str] = None
+    code: Optional[int] = None
+
+
+class ResourceGetResponseDefault(BaseModel):
+    message: Optional[str] = None

tests/data/openapi/use_status_code_in_response_name.yaml

@@ -0,0 +1,40 @@
+openapi: "3.0.0"
+info:
+  version: 1.0.0
+  title: Status Code Response Name Test API
+paths:
+  /resource:
+    get:
+      summary: Get a resource
+      responses:
+        '200':
+          description: Successful response
+          content:
+            application/json:
+              schema:
+                type: object
+                properties:
+                  id:
+                    type: integer
+                  name:
+                    type: string
+        '400':
+          description: Bad request error
+          content:
+            application/json:
+              schema:
+                type: object
+                properties:
+                  error:
+                    type: string
+                  code:
+                    type: integer
+        'default':
+          description: Unexpected error
+          content:
+            application/json:
+              schema:
+                type: object
+                properties:
+                  message:
+                    type: string

tests/main/openapi/test_main_openapi.py

@@ -4223,3 +4223,27 @@ def test_main_openapi_null_only_enum(output_file: Path) -> None:
         assert_func=assert_file_content,
         expected_file="null_only_enum.py",
     )
+
+
+@pytest.mark.cli_doc(
+    options=["--use-status-code-in-response-name"],
+    input_schema="openapi/use_status_code_in_response_name.yaml",
+    cli_args=["--use-status-code-in-response-name", "--openapi-scopes", "schemas", "paths"],
+    golden_output="openapi/use_status_code_in_response_name.py",
+)
+def test_main_openapi_use_status_code_in_response_name(output_file: Path) -> None:
+    """Include HTTP status code in response model names.
+
+    The `--use-status-code-in-response-name` flag includes the HTTP status code
+    in generated response model class names. Instead of generating ambiguous names
+    like ResourceGetResponse, ResourceGetResponse1, ResourceGetResponse2, it generates
+    clear names like ResourceGetResponse200, ResourceGetResponse400, ResourceGetResponseDefault.
+    """
+    run_main_and_assert(
+        input_path=OPEN_API_DATA_PATH / "use_status_code_in_response_name.yaml",
+        output_path=output_file,
+        input_file_type="openapi",
+        assert_func=assert_file_content,
+        expected_file="use_status_code_in_response_name.py",
+        extra_args=["--use-status-code-in-response-name", "--openapi-scopes", "schemas", "paths"],
+    )