Using sa_type causes Mypy type error

[vinodkumars]

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Example Code

fromsqlmodelimportSQLModel, FieldfromsqlalchemyimportDateTimeclassBaseModel(SQLModel): created_at:Optional[datetime]=Field(sa_type=DateTime(timezone=True))

Description

Creating a column with sa_type causes a type error with Mypy. Here is the error:

No overload variant of "Field" matches argument type "DateTime" 

Operating System

macOS

Operating System Details

No response

SQLModel Version

0.0.18

Python Version

3.11.8

Additional Context

No response

[redb0]

I also faced the same problem. Are there any solutions?

I use Python 3.9.19 and sqlmodel 0.0.19

[dolfandringa]

Same basic thing with pyright:

Argument of type "DateTime" cannot be assigned to parameter "sa_type" of type "Type[Any] | PydanticUndefinedType" in function "Field" 

[monchin]

It seems that you should use

fromtypingimportOptionalfromdatetimeimportdatetimefromsqlmodelimportColumn, DateTime, Field, SQLModel, funcclassDateTimeTest(SQLModel): __tablename__="date_time_test"created_at: Optional[datetime] =Field( sa_column=Column(DateTime(timezone=True), server_default=func.now()) )

[monchin]

You can see more details here