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class GroupUsers < ActiveRecord::Migration[4.2]
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def change
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create_table :group_users, force: true do |t|
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t.integer :group_id, null: false
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t.integer :user_id, null: false
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t.timestamps null: false
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end
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add_index :group_users, [:group_id, :user_id], unique: true
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end
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end
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