datamodel-code-generator

Version updated for https://github.com/koxudaxi/datamodel-code-generator to version 0.73.0.

  • This action is used across all versions by 3,464 repositories.

Action Type

This is a Composite action.

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Action Summary

The datamodel-code-generator GitHub Action automates the process of generating Python data models from various schema formats, including OpenAPI 3, AsyncAPI, JSON Schema, Apache Avro, XML Schema, Protocol Buffers/gRPC, GraphQL, and MCP tool schemas. It can also convert existing Python types (Pydantic, dataclass, TypedDict) to different output types and supports Pydantic v2 and multiple model styles such as Pydantic v2 dataclass, dataclasses, TypedDict, or msgspec. The action handles complex schemas with features like $ref, allOf, oneOf, anyOf, enums, and nested types, ensuring type-safe, validated code output for development environments and type checkers.

What’s Changed

Breaking Changes

Error Handling Changes

  • Additional imports are now validated as Python import paths - Values passed via --additional-imports, the Python config API (GenerateConfig, JSONSchemaParserConfig, etc.), or --extra-template-data must now be dotted sequences of Python identifiers. Previously any value was accepted and split on commas without validation; now inputs that are not valid import paths (e.g. containing newlines, semicolons, or non-identifier syntax) raise an Error and abort generation instead of being emitted into the generated output. Valid dotted paths (optionally whitespace-padded) continue to work unchanged. (#3763)
additional_imports must be a Python import path composed of identifiers: 'collections.deque\nINJECTION_MARKER = 1'

Default Behavior Changes

  • Reserved template keys in --extra-template-data now raise an error for built-in templates - When rendering a built-in (project-owned) template, supplying any generator-reserved key through --extra-template-data (or the extra_template_data API argument) now raises an Error and aborts generation instead of injecting the value. The reserved keys are class_body_lines, config_items, schema_runtime_validation, schema_runtime_validation_base_class_name, schema_runtime_validation_use_base, sequence_base_class, sequence_item_type, sequence_slice_type, _safe_config_items, typed_dict_kwargs, and typed_dict_kwargs_suffix. To inject raw code via these keys you must now use a custom root template through --custom-template-dir. (#3765)
  • Stricter extra_template_data validation - extra_template_data that is not a dictionary, contains non-string keys, or contains duplicate (normalized) keys now raises an Error rather than being silently accepted. (#3765)

Code Generation Changes

  • Built-in templates now serialize extra_template_data values as non-executing literals - For built-in templates, user-supplied values that were previously emitted as raw Python source are now serialized as quoted, non-executing literals. This affects GraphQL scalar py_type, TypedDict additionalPropertiesType, ConfigDict values, msgspec base_class_kwargs, and comments. Only bare or dotted identifiers (e.g. datetime.date) are still emitted unquoted; more complex expressions become string literals. For example, a scalar py_type supplied as a type expression is now rendered as:
Evil = TypeAliasType("Evil", "__import__('os').system('id') or str")

Trusted custom root templates (--custom-template-dir providing the root template) keep the previous unrestricted raw behavior. (#3765)

  • Include-only custom template directories no longer receive raw built-in context - “Custom root” detection changed from template_file_path.is_absolute() to _uses_custom_root_template. A --custom-template-dir that only supplies include/partial templates (not the model’s root template) no longer opts the built-in root into the unrestricted raw-context path; its extra_template_data is now treated with the hardened built-in rules (and reserved keys raise an error). (#3765)

What’s Changed

Full Changelog: https://github.com/koxudaxi/datamodel-code-generator/compare/0.72.4...0.73.0