model_json_schema export with Annotated types misses 'required' parameters

[peterroelants]

Initial Checks

• I confirm that I'm using Pydantic V2

Description

It seems that using model_json_schema on type annotations combining typing.Annotated and pydantic.Field result in the Annotated not being marked as required.

Example Code

from typing import Annotated
from pydantic import Field, create_model


Model = create_model(
    'test_model',
    foo=(int, ...),
    bar=(Annotated[int, Field(description="Bar description")], ...),
    baz=(Annotated[int, Field(..., description="Baz description")], ...),
)


Model.model_json_schema()

Results in:

{
   "properties":{
      "foo":{
         "title":"Foo",
         "type":"integer"
      },
      "bar":{
         "description":"Bar description",
         "title":"Bar",
         "type":"integer"
      },
      "baz":{
         "description":"Baz description",
         "title":"Baz",
         "type":"integer"
      }
   },
   "required":[
      "foo"
   ],
   "title":"test_model",
   "type":"object"
}

I would have expected the JSON schema containing 'required': ['foo', 'bar', 'baz'] instead of 'required': ['foo'],

Python, Pydantic & OS Version

pydantic version: 2.6.1
        pydantic-core version: 2.16.2
          pydantic-core build: profile=release pgo=true
                 install path: /home/peter/mambaforge/envs/annotated_docs_env/lib/python3.11/site-packages/pydantic
               python version: 3.11.7 | packaged by conda-forge | (main, Dec 23 2023, 14:43:09) [GCC 12.3.0]
                     platform: Linux-5.15.0-94-generic-x86_64-with-glibc2.31
             related packages: mypy-1.8.0 typing_extensions-4.9.0
                       commit: unknown

[sydney-runkle]

Indeed, a related issue is here: #8534.

I'll mark this as a bug, though I suppose it could also be a feature request attached to #8534 relating to general support for Annotated types with create_model.

Thanks for reporting this! PRs welcome with a fix / support!