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The site had the following in the homepage, "ActiveRecord Change foreign key to a field other than the join tables id." I noticed that the web site stated " A good example for this implementation is when you have a table of retail stores that references a table containing US states." They also stated " By convention, when adding a state reference to the stores table, a state id column is created. Class AddStateToStores ActiveRecord Migration def change add reference states, store, index true, foreign key true end end."