Cannot Import 'UndefinedType' from 'pydantic.fields'

[iliion]

The following dependencies are in a setup.py

"stac_pydantic==2.0.3",
"stac-fastapi.types==2.4.8",
"stac-fastapi.api==2.4.8",
"stac-fastapi.extensions==2.4.8", 

pip install -e <dir>[dev,server] will give me the following import error:

Traceback (most recent call last):
  File "/home/..../stac_fastapi/elasticsearch/app.py", line 6, in <module>
    from stac_fastapi.api.models import create_get_request_model, create_post_request_model
  File "/home/.../.venv/lib/python3.8/site-packages/stac_fastapi/api/models.py", line 9, in <module>
    from pydantic.fields import UndefinedType
ImportError: cannot import name 'UndefinedType' from 'pydantic.fields' (/home/.../.venv/lib/python3.8/site-packages/pydantic/fields.py)

Are there any constraints in package versions in order to make this work? whatever i do i get the above error

Related issue

[iliion]

ok. UndefinedType has become PydanticUndefined. I close the issue

[gadomski]

Did you have to modify your enviornment (e.g. pin dependencies) to get things to work? If so, we should uptake those changes to this repo to help others out.

[iliion]

yes exactly. stac-fastapi is incompatible with V2 of pydantic

The following is V1 -> reference
FYI:

class UndefinedType:
    def __repr__(self) -> str:
        return 'PydanticUndefined'

    def __copy__(self: T) -> T:
        return self

    def __reduce__(self) -> str:
        return 'Undefined'

    def __deepcopy__(self: T, _: Any) -> T:
        return self

[gadomski]

Re-opening as this is a pin that should be added to stac-fastapi.

[iliion]

just for some extra info, the following works for me:

    "pydantic[dotenv]==1.8.2",   
    "stac_pydantic==2.0.3",
    "stac-fastapi.types==2.4.1",
    "stac-fastapi.api==2.4.1",
    "geojson-pydantic==0.6.0",