validation - Rails validates_uniqueness_of, logical AND -

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i have 3 paramaters, e.g. site_id_1 , site_id_2. , transport_distance

when creating new record, rails should validate site_id_1 , site_id_2. dont exist. (so combination matters)

with validates_uniqueness_of(:site_id_1, :site_id_2) says site_id_1 or site_id_2 exist. i've tried: validates_uniqueness_of(:site_id_1 && :site_id_2) doesnt helped me.

you should use scope param of validates_uniqueness_of validator:

validates_uniqueness_of :site_id_1, scope: :site_id_2

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