db/migrate/20180204034416_create_identities.rb


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class CreateIdentities < ActiveRecord::Migration[5.0]
  def change
    create_table :identities do |t|
      t.references :user, foreign_key: { on_delete: :cascade }
      t.string :provider, null: false, default: ''
      t.string :uid, null: false, default: ''

      t.timestamps
    end
  end
end