I have a MySQL VARCHAR column, but I'd like to get ENUM-like behavior at
the ORM level. I'm using the declarative style. Here's what I've got so far:
language = Column(Enum('en', 'fr', native_enum=False), CheckConstraint(),
default='en')
Docs say that when native_enum is set to False, uses VARCHAR + check
constraint for all backends.
What args do I need to pass to CheckConstraint in order to restrict the
list of languages?
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