I'd like to create a mixin to specify naming conventions.
I tried both:
class Base:
metadata = MetaData(naming_convention={
"ix": "ix_%(column_0_label)s",
"uq": "uq_%(table_name)s_%(column_0_name)s",
"ck": "ck_%(table_name)s_%(constraint_name)s",
"fk": "fk_%(table_name)s_%(column_0_name)s_%(referred_table_name)s",
"pk": "pk_%(table_name)",
})
and
class Base:
@declared_attr
def metadata(cls):
return MetaData(naming_convention={
"ix": "ix_%(column_0_label)s",
"uq": "uq_%(table_name)s_%(column_0_name)s",
"ck": "ck_%(table_name)s_%(constraint_name)s",
"fk": "fk_%(table_name)s_%(column_0_name)s_%(referred_table_name)s",
"pk": "pk_%(table_name)",
})
But if I inspect a model created using this base I always got:
>>> Test.metadata.naming_convention
immutabledict({'ix': 'ix_%(column_0_label)s'})
while I correctly have:
>>> Base.metadata.naming_convention
{'ix': 'ix_%(column_0_label)s',
'uq': 'uq_%(table_name)s_%(column_0_name)s',
'ck': 'ck_%(table_name)s_%(constraint_name)s',
'fk': 'fk_%(table_name)s_%(column_0_name)s_%(referred_table_name)s',
'pk': 'pk_%(table_name)'}
What is the correct way to do it? what am i doing wrong? Should I do this
in my migration tool (alembic) ?
Also would it works for unique constraint on multiple column or do we have
to name them explicitly.
Thanks a lot!
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