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