Class J

test/ext/test_indexable.py:68–72

        Base = declarative_base()

        class J(Base):
            __tablename__ = "j"
            id = Column("id", Integer, primary_key=True)
            json = Column("_json", JSON, default={})
            field = index_property("json", "field")

        j = J(json={"a": 1, "b": 2})
        assert_raises(AttributeError, lambda: j.field)