ruby-on-rails - 为什么 false 会使 validates_presence_of 无效？

Question

重现此问题的正确步骤:

prompt> rails test_app
prompt> cd test_app
prompt> script/generate model event_service published:boolean

然后进入迁移并添加 not null 并默认发布为 false:

class CreateEventServices < ActiveRecord::Migration
  def self.up
    create_table :event_services do |t|
      t.boolean :published, :null => false, :default => false
      t.timestamps
    end
  end

  def self.down
    drop_table :event_services
  end
end

现在迁移您的更改并运行测试:

prompt>rake db:migrate
prompt>rake

此时您应该不会收到任何错误。现在编辑模型以便您发布 validate_presence_of:

class EventService < ActiveRecord::Base
  validates_presence_of :published
end

现在编辑单元测试event_service_test.rb:

require 'test_helper'

class EventServiceTest < ActiveSupport::TestCase
  test "the truth" do
    e = EventService.new
    e.published = false
    assert e.valid?
  end
end

并运行 rake:

prompt>rake

您将在测试中收到错误。现在将 e.published 设置为 true 并重新运行测试。有用!我认为这可能与该字段为 bool 值有关，但我无法弄清楚。这是 Rails 中的错误吗？还是我做错了什么？

Answer 1

请参阅API docs ...

If you want to validate the presence of a boolean field (where the real values are true and false), you will want to use validates_inclusion_of :field_name, :in => [true, false].