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class CreateSmiles < ActiveRecord::Migration[4.2]
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def change
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create_table :smiles do |t|
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t.integer :user_id
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t.integer :answer_id
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t.timestamps
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end
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add_index :smiles, :user_id
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add_index :smiles, :answer_id
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add_index :smiles, [:user_id, :answer_id], unique: true
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end
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end
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