ruby-on-rails - rails : "t.references" not working when creating index

Question

class CreateBallots < ActiveRecord::Migration
  def change
    create_table :ballots do |t|
      t.references :user
      t.references :score
      t.references :election
      t.string :key
      t.timestamps
    end
    add_index :ballots, :user
    add_index :ballots, :score
    add_index :ballots, :election
  end
end

结果是:

SQLite3::SQLException: table ballots has no column named user: CREATE  INDEX "index_ballots_on_user" ON "ballots" ("user")/home/muhd/awesomevote/db/migrate/20130624024349_create_ballots.rb:10:in `change'

我以为 t.references应该为我处理那个？

Answer 1

你忘了像这样添加“_id”:

add_index :ballots, :user_id

或者，如果您希望它自动索引:

t.references :user, index: true

更多信息: add_index , references

HTH