What's Changed

• Support $defs for Draft 2019-09 by @koxudaxi in https://github.com/koxudaxi/datamodel-code-generator/pull/1630
• Update openapi-spec-validator max version by @koxudaxi in https://github.com/koxudaxi/datamodel-code-generator/pull/1633
• Fix list default in dataclass by @koxudaxi in https://github.com/koxudaxi/datamodel-code-generator/pull/1632
• Support python 3.12 by @koxudaxi in https://github.com/koxudaxi/datamodel-code-generator/pull/1612
• Fix --remove-special-field-name-prefix + fields (e.g. enum members) starting with numbers by @lord-haffi in https://github.com/koxudaxi/datamodel-code-generator/pull/1654
• Fix generation of nullable array items by @tfausten in https://github.com/koxudaxi/datamodel-code-generator/pull/1648
• Move nullable logic to openapi parser by @koxudaxi in https://github.com/koxudaxi/datamodel-code-generator/pull/1655
• Add missing space to README.md by @joakimnordling in https://github.com/koxudaxi/datamodel-code-generator/pull/1660
• Improve model naming by @koxudaxi in https://github.com/koxudaxi/datamodel-code-generator/pull/1663
• Fix exponent in minimum by @koxudaxi in https://github.com/koxudaxi/datamodel-code-generator/pull/1664
• Remove constraint on anyurl by @koxudaxi in https://github.com/koxudaxi/datamodel-code-generator/pull/1665
• Improve discriminator by @koxudaxi in https://github.com/koxudaxi/datamodel-code-generator/pull/1666

New Contributors

• @lord-haffi made their first contribution in https://github.com/koxudaxi/datamodel-code-generator/pull/1654
• @tfausten made their first contribution in https://github.com/koxudaxi/datamodel-code-generator/pull/1648
• @joakimnordling made their first contribution in https://github.com/koxudaxi/datamodel-code-generator/pull/1660

Full Changelog: https://github.com/koxudaxi/datamodel-code-generator/compare/0.22.1...0.23.0

What's Changed

• Ignore broken pydantic version 2.4.0 by @koxudaxi in https://github.com/koxudaxi/datamodel-code-generator/pull/1593
• Avoid pydantic ClassVar bug by @koxudaxi in https://github.com/koxudaxi/datamodel-code-generator/pull/1603
• Fix msgspec pattern and optional annotated type by @indrat in https://github.com/koxudaxi/datamodel-code-generator/pull/1606
• Fix missing constr import issue by @koxudaxi in https://github.com/koxudaxi/datamodel-code-generator/pull/1609
• Fix msgspec root import by @koxudaxi in https://github.com/koxudaxi/datamodel-code-generator/pull/1611

Full Changelog: https://github.com/koxudaxi/datamodel-code-generator/compare/0.22.0...0.22.1

What's Changed

• Organize help options by @howardj99 in https://github.com/koxudaxi/datamodel-code-generator/pull/1540
• fix: add type parameters to generic RootModel by @tcrasset in https://github.com/koxudaxi/datamodel-code-generator/pull/1560
• chore: link to contributing guidelines from README.md by @tcrasset in https://github.com/koxudaxi/datamodel-code-generator/pull/1561
• Fix base path to avoid duplicate parts in path when deleting reference by @pedrosmr in https://github.com/koxudaxi/datamodel-code-generator/pull/1550
• Support msgspec output by @indrat in https://github.com/koxudaxi/datamodel-code-generator/pull/1551

New Contributors

• @howardj99 made their first contribution in https://github.com/koxudaxi/datamodel-code-generator/pull/1540
• @tcrasset made their first contribution in https://github.com/koxudaxi/datamodel-code-generator/pull/1560
• @pedrosmr made their first contribution in https://github.com/koxudaxi/datamodel-code-generator/pull/1550
• @indrat made their first contribution in https://github.com/koxudaxi/datamodel-code-generator/pull/1551

Full Changelog: https://github.com/koxudaxi/datamodel-code-generator/compare/0.21.5...0.22.0

What's Changed

• Added protect namespace to Pydantic v2 ConfigDict by @willarmiros in https://github.com/koxudaxi/datamodel-code-generator/pull/1489
• Fix pydantic 2.2.1 RootModel cannot have extra_fields error by @i404788 in https://github.com/koxudaxi/datamodel-code-generator/pull/1497
• Add missing default=None by @twoodwark in https://github.com/koxudaxi/datamodel-code-generator/pull/1515
• Fix class Field generated when array with name fields with oneOf inside by @mjperrone in https://github.com/koxudaxi/datamodel-code-generator/pull/1516

New Contributors

• @willarmiros made their first contribution in https://github.com/koxudaxi/datamodel-code-generator/pull/1489
• @twoodwark made their first contribution in https://github.com/koxudaxi/datamodel-code-generator/pull/1515
• @mjperrone made their first contribution in https://github.com/koxudaxi/datamodel-code-generator/pull/1516

Full Changelog: https://github.com/koxudaxi/datamodel-code-generator/compare/0.21.4...0.21.5

What's Changed

• Update openapi-spec-validator to 0.5.7 by @der-eismann in https://github.com/koxudaxi/datamodel-code-generator/pull/1475
• Fix Pydantic V2 RootModel inheritance by @barreeeiroo in https://github.com/koxudaxi/datamodel-code-generator/pull/1477
• main: fix configuration model validation after CLI args merge by @airwoodix in https://github.com/koxudaxi/datamodel-code-generator/pull/1448
• Fix const for pydantic_v2 by @koxudaxi in https://github.com/koxudaxi/datamodel-code-generator/pull/1482
• Unique list is defined as list by @koxudaxi in https://github.com/koxudaxi/datamodel-code-generator/pull/1484
• switch away from deprecated pydantic method by @iliakur in https://github.com/koxudaxi/datamodel-code-generator/pull/1485
• Fix condecimal by @koxudaxi in https://github.com/koxudaxi/datamodel-code-generator/pull/1487
• Add unittest for discriminator by @koxudaxi in https://github.com/koxudaxi/datamodel-code-generator/pull/1488

New Contributors

• @der-eismann made their first contribution in https://github.com/koxudaxi/datamodel-code-generator/pull/1475
• @barreeeiroo made their first contribution in https://github.com/koxudaxi/datamodel-code-generator/pull/1477
• @iliakur made their first contribution in https://github.com/koxudaxi/datamodel-code-generator/pull/1485

Full Changelog: https://github.com/koxudaxi/datamodel-code-generator/compare/0.21.3...0.21.4

What's Changed

• Give Pydantic V2 its own dump_resolve_reference_action to use model_rebuild not update_forward_refs by @lmmx in https://github.com/koxudaxi/datamodel-code-generator/pull/1468
• fix: Fix regex expression of hostname in pydantic v2 by @xu-cheng in https://github.com/koxudaxi/datamodel-code-generator/pull/1449
• Add base_class validation similar to _validate_base_class to bare generate calls by @kylebebak in https://github.com/koxudaxi/datamodel-code-generator/pull/1453
• Fix issue #1461: Open API parameter models use base class if set by @piercsi in https://github.com/koxudaxi/datamodel-code-generator/pull/1462
• Issues 1454 typeddict not required optional bug fix by @kylebebak in https://github.com/koxudaxi/datamodel-code-generator/pull/1457

New Contributors

• @lmmx made their first contribution in https://github.com/koxudaxi/datamodel-code-generator/pull/1468
• @xu-cheng made their first contribution in https://github.com/koxudaxi/datamodel-code-generator/pull/1449
• @kylebebak made their first contribution in https://github.com/koxudaxi/datamodel-code-generator/pull/1453
• @piercsi made their first contribution in https://github.com/koxudaxi/datamodel-code-generator/pull/1462

Full Changelog: https://github.com/koxudaxi/datamodel-code-generator/compare/0.21.2...0.21.3

What's Changed

• Pre-commit-hooks by @yehoshuadimarsky in https://github.com/koxudaxi/datamodel-code-generator/pull/1416
• feat: add additional imports by @skonik in https://github.com/koxudaxi/datamodel-code-generator/pull/1422
• Add orm_mode to Config(BaseModel) by @Beaueve in https://github.com/koxudaxi/datamodel-code-generator/pull/1425
• Fix "parent" AttributeError when calling --collapse-root-models by @imankulov in https://github.com/koxudaxi/datamodel-code-generator/pull/1432

New Contributors

• @yehoshuadimarsky made their first contribution in https://github.com/koxudaxi/datamodel-code-generator/pull/1416
• @skonik made their first contribution in https://github.com/koxudaxi/datamodel-code-generator/pull/1422
• @Beaueve made their first contribution in https://github.com/koxudaxi/datamodel-code-generator/pull/1425
• @imankulov made their first contribution in https://github.com/koxudaxi/datamodel-code-generator/pull/1432

Full Changelog: https://github.com/koxudaxi/datamodel-code-generator/compare/0.21.1...0.21.2

What's Changed

• Relax version constraint of prance by @tetsuok in https://github.com/koxudaxi/datamodel-code-generator/pull/1409
• Fix optional field doesn't include None by @koxudaxi in https://github.com/koxudaxi/datamodel-code-generator/pull/1411

New Contributors

• @tetsuok made their first contribution in https://github.com/koxudaxi/datamodel-code-generator/pull/1409

Full Changelog: https://github.com/koxudaxi/datamodel-code-generator/compare/0.21.0...0.21.1

What's Changed

• pyproject: correct poetry-core package name by @ConnorBaker in https://github.com/koxudaxi/datamodel-code-generator/pull/1374
• Support pydantic v2 in runtime by @koxudaxi in https://github.com/koxudaxi/datamodel-code-generator/pull/1392
• Add pydantic v2 as output model type by @koxudaxi in https://github.com/koxudaxi/datamodel-code-generator/pull/1391
• Add --use-unique-items as set by @koxudaxi in https://github.com/koxudaxi/datamodel-code-generator/pull/1400

New Contributors

• @ConnorBaker made their first contribution in https://github.com/koxudaxi/datamodel-code-generator/pull/1374

What is the difference between pydantic v1 and v2 output model?

Summary

datamodel-code-generator supports Pydantic v1 and v2 as output model type.

Pydantic v2 is a major release with many breaking changes. See the migration guide for more information: https://docs.pydantic.dev/2.0/migration/

What's changes in v2 output?

__root__ field (a.k.a Custom Root Types)

__root__ field (a.k.a Custom Root Types) is removed in pydantic v2. The model is changed to RootModel

pydantic.Field

https://docs.pydantic.dev/2.0/migration/#changes-to-pydanticfield

• const -> removed
• min_items (use min_length instead)
• max_items (use max_length instead)
• unique_items -> removed and the list type will be replaced by typing.Set. this feature is discussed in https://github.com/pydantic/pydantic-core/issues/296
• allow_mutation (use frozen instead)
• regex (use pattern instead)

Model Config

• pydantic.Config -> pydantic.ConfigDict
• allow_mutation —> frozen (inverse value for getting same behavior).
• allow_population_by_field_name → populate_by_name

Full Changelog: https://github.com/koxudaxi/datamodel-code-generator/compare/0.20.0...0.21.0

What's Changed

• Update documentation by @noddycode in https://github.com/koxudaxi/datamodel-code-generator/pull/1316
• Support TypedDict as output type by @koxudaxi in https://github.com/koxudaxi/datamodel-code-generator/pull/1309
• Remove self attribute from jsonschema root attributes by @rezen in https://github.com/koxudaxi/datamodel-code-generator/pull/1318
• Fix $ref With Path Items by @zach-hamm in https://github.com/koxudaxi/datamodel-code-generator/pull/1323
• Remove keep-runtime-typing on ruff config by @koxudaxi in https://github.com/koxudaxi/datamodel-code-generator/pull/1349
• Update openapi-spec-validator to 0.5.2 by @Fokko in https://github.com/koxudaxi/datamodel-code-generator/pull/1343
• Added support for model wise base classes by @senesh-deshan in https://github.com/koxudaxi/datamodel-code-generator/pull/1350
• Fix the custom file header by @Fokko in https://github.com/koxudaxi/datamodel-code-generator/pull/1346

Breaking Changes

• Eliminate the naming differences of model names and field names by the OS by @koxudaxi in https://github.com/koxudaxi/datamodel-code-generator/pull/1348

Due to differences in file loading order between operating systems, we've added a sorting process when fetching file listings within directories in order to eliminate discrepancies in model and field names. As a result, model names that differ from those generated by existing earlier versions may be produced.

New Contributors

• @noddycode made their first contribution in https://github.com/koxudaxi/datamodel-code-generator/pull/1316
• @rezen made their first contribution in https://github.com/koxudaxi/datamodel-code-generator/pull/1318
• @zach-hamm made their first contribution in https://github.com/koxudaxi/datamodel-code-generator/pull/1323
• @Fokko made their first contribution in https://github.com/koxudaxi/datamodel-code-generator/pull/1343
• @senesh-deshan made their first contribution in https://github.com/koxudaxi/datamodel-code-generator/pull/1350

Full Changelog: https://github.com/koxudaxi/datamodel-code-generator/compare/0.19.0...0.20.0