如何为rails迁移定义布尔字段

Question

I want to add a boolean value field ("is_public") to the table "my_model". Currently I can use this:

class AddPublicToDream < ActiveRecord::Migration
  def self.up
    add_column :my_model, :is_public, :string
  end

  def self.down
    remove_column :my_model, :is_public, :string
  end

end

Then I can assign "true" or "false" to mymodel.is_public in controllers.

Can I substitute :string with :boolean to achieve the same effect? Would it save some database space comparing to :string?

Answer 1

是的，您可以使用:boolean为此，是的，它也将节省数据库空间。

Answer 2

Change the type attribute to :boolean and run rake db:migrate again. You should be able to call, for example:

Dream.is_public?  # returning true or false depending whether is set.