我正在使用Factory_girl

Factory.sequence :name do |n| “name-#{n}” end

Factory.define :user do |u| u.first_name{ Factory.next(:name) }
u.last_name { |u| ‘last_’ + u.first_name } u.password ‘secret’
u.password_confirmation { |u| u.password } u.sequence(:email) { |i|
“user_#{i}@example.com” }

end

和这个简单的测试

specify { Factory.build(:user).should be_valid }

生成以下警告

DEPRECATION WARNING: You’re trying to create an attribute user_id'.
Writing arbitrary attributes on a model is deprecated. Please just use
attr_writer` etc. (called from block (2 levels) in
at…

我该如何摆脱呢？