Apr 9, 2012. Don't do this. Use the built-in id field as the primary key. If you're going to use Rails, you should build your app the "Rails way" unless you have.
ruby – How to add primary key to Rails? – Stack Overflow – Apr 14, 2017. This content will be auto generated from your migrate files. Try find your create bookmarks migrate file and add :primary_key => bk_id to it.
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Ruby on Rails Guides: Migrations – Active Record tracks which migrations have already been run so all you have to do is update your. By default create_table will create a primary key called id.
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Sep 30, 2013. The first step to changing the primary key involves the migration file. this asks Rails not to create a primary key column on your behalf.