Revert "Revert "Assert primary key does not exist in habtm when the...
Revert "Revert "Assert primary key does not exist in habtm when the association is defined, instead of doing that everytime a record is inserted."" This reverts commit 2b82708b. [#3128 state:resolved] Conflicts: activerecord/lib/active_record/associations.rb activerecord/lib/active_record/associations/has_and_belongs_to_many_association.rb
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