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sample_app_ch9/db/migrate/20131118215946_create_relationships.rb

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class CreateRelationships < ActiveRecord::Migration
def change
create_table :relationships do |t|
t.integer :follower_id
t.integer :followed_id
t.timestamps
end
add_index :relationships, :follower_id
add_index :relationships, :followed_id
add_index :relationships, [:follower_id, :followed_id], unique: true
end
end