Update datamodel-code-generator to 0.56.1

[koxudaxi]

Summary by CodeRabbit

• New Features

  • --enum-field-as-literal gains a none choice
  • Added pydantic_v2.dataclass as an output model option; default output model now pydantic_v2.BaseModel

• Chores

  • Dropped Python 3.9 from supported/target versions (minimum 3.10)
  • Updated dependency constraint for the code-generator package

• Behavioral/Generated Output

  • Generated FastAPI code uses explicit Query(...) for some optional query params and moves Pydantic v1 patterns to v2-style models/config

• Documentation

  • CLI help and output-type docs updated to reflect the above

• Tests

  • Added test validating alias escaping and Query/Header generation

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Walkthrough

Docs, types, CLI, and parser updated to prefer Pydantic v2: default output model set to pydantic_v2.BaseModel (and pydantic_v2.dataclass added), pydantic.BaseModel removed, Python 3.9 removed from allowed versions, enum_field_as_literal gains none, parser emits Query(...) for optional list query params and adopts Pydantic v2 constructs.

Changes

Cohort / File(s)	Summary
Documentation Updates README.md, docs/cli-reference.md, docs/index.md, docs/llms-full.txt, docs/supported_formats.md	CLI help/docs updated: --enum-field-as-literal adds none; --output-model-type docs switched to pydantic_v2.* and default to pydantic_v2.BaseModel (removed pydantic.BaseModel); --python-version no longer lists 3.9.
Type & Config Schemas fastapi_code_generator/_types/generate_config_dict.py, fastapi_code_generator/config.py, fastapi_code_generator/prompt_data.py	Typing and config adjusted: TypedDict optionals use `T
CLI & Entry Point fastapi_code_generator/cli.py	CLI defaults changed: output_model_type default set to DataModelType.PydanticV2BaseModel in main() and generate_code(); imports adjusted to use datamodel_code_generator.enums/format.
Parser & Runtime Model Changes fastapi_code_generator/parser.py	Migrated runtime models to Pydantic v2: default root type → RootModel, CachedPropertyModel uses model_config = ConfigDict(...), runtime root checks updated, and get_parameter_type() now wraps optional list query defaults with fastapi.Query(...) and tightens alias error logic.
Prompt Data Generation Script scripts/build_prompt_data.py, fastapi_code_generator/prompt_data.py	Script refactored to produce structured prompt payload (PROMPT_DATA) instead of simple option descriptions; new rendering helpers and CLI --output support; replaces previous build/update behavior.
Dependency pyproject.toml	Bumped datamodel-code-generator[http] constraint from >=0.45,<0.46 to >=0.56.1,<0.57.
Generated Test Fixtures — Models tests/data/expected/.../models.py (multiple files)	Fixtures updated for Pydantic v2: use RootModel[...] for root lists, replace datetime with pydantic.AwareDatetime for timestamps, convert inner class Config → model_config = ConfigDict(...), change example= → examples=[...], and add Field(..., examples=[...]) where applicable.
Generated Test Fixtures — Endpoints tests/data/expected/.../main.py (multiple files)	Endpoint signatures updated: response/request wrapper classes replaced with direct List[...] types; optional list query params use Query(None); imports and typing updated accordingly.
Tests tests/test_config.py, tests/main/test_main.py	Tests updated/added: expected defaults and CLI choices updated to reflect pydantic_v2 changes; new test validates escaped-alias preservation in generated Query/Header alias arguments.
Test Fixture Removals tests/data/expected/openapi/coverage/model_options/custom_models.py	Removed several exported root-model wrapper classes that previously exposed root: List[...], replaced by direct list types elsewhere.

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~25 minutes

Possibly related PRs

• Port workflow and docs automation stack #517: Direct overlap — modifies config/types, prompt metadata, CLI docs, and defaults to align with Pydantic v2 and the enum/option changes.

Poem

🐰
Hopped through configs, v2 lights the trail,
Root fields now root, and queries wear a veil,
Three point nine waved, a gentle goodbye,
Options grew none — a small happy sigh,
A carrot for clarity, nibble and prevail! 🥕

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 32.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately describes the primary change: updating the datamodel-code-generator dependency from 0.45.x to 0.56.1, which triggers cascading updates across CLI options, configuration types, and test fixtures.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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[codspeed-hq]

Merging this PR will degrade performance by 18.48%

⚠️ Unknown Walltime execution environment detected

Using the Walltime instrument on standard Hosted Runners will lead to inconsistent data.

For the most accurate results, we recommend using CodSpeed Macro Runners: bare-metal machines fine-tuned for performance measurement consistency.

⚠️ Different runtime environments detected

Some benchmarks with significant performance changes were compared across different runtime environments,
which may affect the accuracy of the results.

Open the report in CodSpeed to investigate

❌ 1 regressed benchmark

⚠️ Please fix the performance issues or acknowledge them on CodSpeed.

Performance Changes

	Benchmark	BASE	HEAD	Efficiency
❌	test_generate_default_template_benchmark	37.2 ms	45.7 ms	-18.48%

---

_{Comparing chore/update-datamodel-code-generator-0-56-1 (13aaf10) with main (342dc40)}

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (342dc40) to head (13aaf10).
⚠️ Report is 12 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #534   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           16        16           
  Lines         1012      1049   +37     
  Branches       110       110           
=========================================
+ Hits          1012      1049   +37     

Flag	Coverage Δ
unittests	100.00% <100.00%> (ø)

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📚 Docs Preview: https://pr-534.fastapi-code-generator.pages.dev

[coderabbitai]

Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against the current code and only fix it if needed.

Inline comments:
In `@tests/data/expected/openapi/coverage/model_options/main.py`:
- Around line 64-67: The GET endpoint show_food_by_id currently declares the
list query parameter as message_texts: Optional[List[str]] = None which FastAPI
treats as a request body; change the signature to message_texts:
Optional[List[str]] = Query(None) and add the Query import from fastapi so
FastAPI recognizes it as an optional list query parameter (update the function
show_food_by_id and imports accordingly).

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📥 Commits

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⛔ Files ignored due to path filters (1)

• uv.lock is excluded by !**/*.lock

📒 Files selected for processing (18)

• README.md
• docs/cli-reference.md
• docs/index.md
• docs/llms-full.txt
• docs/supported_formats.md
• fastapi_code_generator/_types/generate_config_dict.py
• fastapi_code_generator/cli.py
• fastapi_code_generator/config.py
• fastapi_code_generator/parser.py
• fastapi_code_generator/prompt_data.py
• pyproject.toml
• tests/data/expected/openapi/coverage/model_options/custom_models.py
• tests/data/expected/openapi/coverage/model_options/main.py
• tests/data/expected/openapi/default_template/body_and_parameters/models.py
• tests/data/expected/openapi/default_template/discriminator_in_root_with_properties/models.py
• tests/data/expected/openapi/default_template/recursion/models.py
• tests/data/expected/openapi/default_template/shadowed_imports/models.py
• tests/test_config.py

💤 Files with no reviewable changes (1)

• tests/data/expected/openapi/coverage/model_options/custom_models.py

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Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against the current code and only fix it if needed.

Inline comments:
In `@fastapi_code_generator/parser.py`:
- Around line 389-397: Replace raw single-quoted orig_name usages with a
repr-wrapped value to safely escape quotes/backslashes; specifically update the
alias construction in the Query branch (replace alias = f", alias='{orig_name}'"
with alias = f", alias={repr(orig_name)}") and the inline alias in the non-query
branch (replace alias='orig_name' inside the f-string for param_is with
alias={repr(orig_name)}), keeping the existing logic for required/default and
imports_for_fastapi, Query, param_is, default_value, alias and default
variables.

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• fastapi_code_generator/parser.py
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• tests/data/expected/openapi/remote_ref/body_and_parameters/main.py

[coderabbitai]

Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against the current code and only fix it if needed.

Inline comments:
In `@scripts/build_prompt_data.py`:
- Around line 128-131: The help text for the "--output" argument is stale
because _render_output can emit Python when the path ends with .py, so update
the parser.add_argument help string (the "--output" argument in
build_prompt_data.py) to describe that the file may be JSON or a Python module
depending on the extension (e.g., ".json" for JSON payload, ".py" for Python),
and optionally mention that format selection is done by _render_output based on
the output filename extension.

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⛔ Files ignored due to path filters (1)

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📒 Files selected for processing (6)

• docs/cli-reference.md
• docs/llms-full.txt
• fastapi_code_generator/prompt_data.py
• pyproject.toml
• scripts/build_prompt_data.py
• tests/main/test_main.py

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• pyproject.toml

🚧 Files skipped from review as they are similar to previous changes (2)

• fastapi_code_generator/prompt_data.py
• docs/llms-full.txt