How to check if at least one of two specific fields in a table is NOT NULL in Sqlalchemy ORM?

Question

I have two fields:

class Person(base):
     field1 = Column(String(32), unique=True, nullable=True)
     field2 = Column(String(128), unique=True, nullable=True)
     field3 = ...
     ...

I need to create a constraint, to check if at least one of [field1, field2] is available. I guess I need to use CheckConstraint, but I failed to get a result. Any ideas?

score 7 · Answer 1 · edited May 23 '17 at 10:29

7

Thanks to this post:

__table_args__ = (
        CheckConstraint('NOT(field1 IS NULL AND field2 IS NULL)'),
        )

edited May 23 '17 at 10:29

Community

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answered Dec 29 '15 at 22:01

Farshid Ashouri

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How to check if at least one of two specific fields in a table is NOT NULL in Sqlalchemy ORM?

1 Answers1