Add multiple --input-model support with inheritance preservation

src/datamodel_code_generator/_types/graphql_parser_config_dict.py

@@ -30,7 +30,7 @@
     from datamodel_code_generator.types import DataTypeManager
 
 
-class GraphQLParserConfigDict(TypedDict):
+class ParserConfig(TypedDict):
     data_model_type: NotRequired[type[DataModel]]
     data_model_root_type: NotRequired[type[DataModel]]
     data_type_manager_type: NotRequired[type[DataTypeManager]]
@@ -142,5 +142,8 @@ class GraphQLParserConfigDict(TypedDict):
     read_only_write_only_model_type: NotRequired[ReadOnlyWriteOnlyModelType | None]
     field_type_collision_strategy: NotRequired[FieldTypeCollisionStrategy | None]
     target_pydantic_version: NotRequired[TargetPydanticVersion | None]
+
+
+class GraphQLParserConfigDict(ParserConfig):
     data_model_scalar_type: NotRequired[type[DataModel]]
     data_model_union_type: NotRequired[type[DataModel]]

src/datamodel_code_generator/_types/jsonschema_parser_config_dict.py

@@ -30,7 +30,7 @@
     from datamodel_code_generator.types import DataTypeManager
 
 
-class JSONSchemaParserConfigDict(TypedDict):
+class ParserConfig(TypedDict):
     data_model_type: NotRequired[type[DataModel]]
     data_model_root_type: NotRequired[type[DataModel]]
     data_type_manager_type: NotRequired[type[DataTypeManager]]
@@ -142,3 +142,7 @@ class JSONSchemaParserConfigDict(TypedDict):
     read_only_write_only_model_type: NotRequired[ReadOnlyWriteOnlyModelType | None]
     field_type_collision_strategy: NotRequired[FieldTypeCollisionStrategy | None]
     target_pydantic_version: NotRequired[TargetPydanticVersion | None]
+
+
+class JSONSchemaParserConfigDict(ParserConfig):
+    pass

src/datamodel_code_generator/_types/openapi_parser_config_dict.py

@@ -31,7 +31,7 @@
     from datamodel_code_generator.types import DataTypeManager
 
 
-class OpenAPIParserConfigDict(TypedDict):
+class ParserConfig(TypedDict):
     data_model_type: NotRequired[type[DataModel]]
     data_model_root_type: NotRequired[type[DataModel]]
     data_type_manager_type: NotRequired[type[DataTypeManager]]
@@ -143,6 +143,13 @@ class OpenAPIParserConfigDict(TypedDict):
     read_only_write_only_model_type: NotRequired[ReadOnlyWriteOnlyModelType | None]
     field_type_collision_strategy: NotRequired[FieldTypeCollisionStrategy | None]
     target_pydantic_version: NotRequired[TargetPydanticVersion | None]
+
+
+class JSONSchemaParserConfig(ParserConfig):
+    pass
+
+
+class OpenAPIParserConfigDict(JSONSchemaParserConfig):
     openapi_scopes: NotRequired[list[OpenAPIScope] | None]
     include_path_parameters: NotRequired[bool]
     use_status_code_in_response_name: NotRequired[bool]

src/datamodel_code_generator/arguments.py

@@ -159,8 +159,10 @@ def start_section(self, heading: str | None) -> None:
 )
 base_options.add_argument(
     "--input-model",
+    action="append",
     help="Python import path to a Pydantic v2 model or schema dict "
     "(e.g., 'mypackage.module:ClassName' or 'mypackage.schemas:SCHEMA_DICT'). "
+    "Can be specified multiple times for related models with inheritance. "
     "For dict input, --input-file-type is required. "
     "Cannot be used with --input or --url.",
     metavar="MODULE:NAME",