I have 3 models, say A, B and C, and they are set up like this:
A:
has_many :Bs
has_many :Cs, through: B
B:
belongs_to A:
has_many :Cs
C:
belongs_to B:
In my model for C, I want to declare, that a column ccol within C must
be unique, but only within the scope of a certain A.
If the constraint would require uniqueness within a certain B, I could
write
validates :ccol, uniqueness: { scope: :B_id }
But since C doesn't contain an A_id as foreign key, I can not express it
in this way.
Is there a possibility to achieve this?
Ronald
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