应该使用class_name 和foreign_key [英] Shoulda belongs_to with class_name and foreign_key

问题描述

我知道您可以使用 Shoulda 轻松测试归属关系:

describe Dog dog它{应该属于(:所有者)}结尾

是否可以使用 Shoulda 测试更复杂的belongs_to 关系?像这样:

class Dog "人", :foreign_key =>person_id"结尾

解决方案

您应该能够使用:

它{应该属于(:owner).class_name('Person') }

Shoulda 的 belong_to 匹配器总是从关联中读取 foreign_key 并测试它是否是有效的字段名称，因此您无需再执行任何操作.

(参见 和相关方法)

I know you can easily test a belongs to relationship using Shoulda:

describe Dog dog
  it { should belong_to(:owner) }
end

Is it possible to test a more complicated belongs_to relationship using Shoulda? Something like this:

class Dog < ActiveRecord::Base
  belongs_to :owner, :class_name => "Person", :foreign_key => "person_id"
end

解决方案

You should be able to use:

it { should belong_to(:owner).class_name('Person') }

Shoulda's belong_to matcher always reads the foreign_key from the association and tests that it is a valid field name, so you don't need to do anything more.

(See Shoulda::Matchers::ActiveRecord::AssociationMatcher#foreign_key_exists? and associated methods)

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