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constraints

CheckColumns

Bases: CheckConstraint

Subclass of sqlalchemy.CheckConstraint. Used to avoid importing anything from sqlalchemy by user.

Note that some databases do not actively support check constraints such as MySQL.

Source code in ormar\fields\constraints.py 
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class CheckColumns(CheckConstraint):
    """
    Subclass of sqlalchemy.CheckConstraint.
    Used to avoid importing anything from sqlalchemy by user.

    Note that some databases do not actively support check constraints such as MySQL.
    """

UniqueColumns

Bases: UniqueConstraint

Subclass of sqlalchemy.UniqueConstraint. Used to avoid importing anything from sqlalchemy by user.

Source code in ormar\fields\constraints.py 
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class UniqueColumns(UniqueConstraint):
    """
    Subclass of sqlalchemy.UniqueConstraint.
    Used to avoid importing anything from sqlalchemy by user.
    """