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giving the index a name
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db/migrate/20091219054212_create_more_prompt_indexes.rb
| 1 | 1 | class CreateMorePromptIndexes < ActiveRecord::Migration |
| 2 | 2 | def self.up |
| 3 | - add_index :prompts, [:left_choice_id, :right_choice_id, :question_id], :name => "a_cool_index" | |
| 3 | + add_index :prompts, [:left_choice_id, :right_choice_id, :question_id], :name => "a_cool_index", :unique => true | |
| 4 | 4 | end |
| 5 | 5 | |
| 6 | 6 | def self.down | ... | ... |