Shoulda matchers have_many with custom relation name

rspec, ruby-on-rails, shoulda

Solution

shoulda matchers includes a `.with_foreign_key()` option.

https://github.com/thoughtbot/shoulda-matchers#have_many

So in your example:

describe User do
  it { should have_many(:articles).with_foreign_key('author_id') }
end

Which is how your model should, I believe:

class User < ActiveRecord::Base
  has_many :articles, foreign_key: "author_id"
end

Problem

How do I test this ActiveRecord relation using shoulda matchers? Models ``` class User < ActiveRecord::Base has_many :articles end class Article < ActiveRecord::Base belongs_to :author, class_name: 'User' end ``` Test ``` describe User do it { should have_many(:articles) } end ``` I'm getting the following error: ``` 1) User should have many articles Failure/Error: it { should have_many(:articles) } Expected User to have a has_many association called articles (Article does not have a user_id foreign key.) # ./spec/models/user_spec.rb:4:in `block (2 levels) in <top (required)>' ``` So it obviously expects relation field to be named `user_id` because of User class name. I expect there has to be some test method that can be used to override this expectation like ``` it { should have_many(:articles).as(:owner) } ``` But I can't find anything like it. Am I missing something obvious?

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