Allow association foreign_key to be an Array
#51334
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Currently the only way to setup a composite foreign key is to use `query_constraints`. With our intention to decouple `query_constraints` from `foreign_key` we need to allow `foreign_key` to be an Array to preserve the current behavior achieved with `query_constraints`.
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Related to #49671 (comment)
Currently the only way to setup a composite foreign key is to use
query_constraints. With our intention to decouplequery_constraintsfromforeign_keywe need to allowforeign_keyto be an Array to preserve the current behavior achieved withquery_constraints.