🐛 FIX: Exception when rendering CheckConstraints

[Starbat]

To get support from mypy and other tools, it is helpful to express CheckConstraints not as text but as expressions with direct reference to the column objects. This is currently not possible.

from sqlalchemy import CheckConstraint
from sqlalchemy.orm import Mapped, mapped_column
from sqlalchemy.sql import func


class Project(Schema):
    __tablename__ = "projects"

    number: Mapped[int] = mapped_column(primary_key=True)
    name: Mapped[str] = mapped_column()

    __table_args__ = (
        CheckConstraint(func.length(func.trim(name)) > 0, "check_project_has_name"),
    )

Building the docs for this model causes the following exception:

AttributeError: Neither 'BinaryExpression' object nor 'Comparator' object has an attribute 'text'

This small adjustment makes it work.

[chrisjsewell]

cheers!