CODEWITHSUNDEEP
ruby-on-railsmongoid
Goalie
Goalie

Reputation: 3105

How do you use the has_many_related relationship in mongoid 3+?

I am currently migrating from mongoid 2.0 to mongoid 3.0.5. One of the relationships I have in an object is a has_many_related. How do I migrate this over to mongoid 3.0.5? I couldn't find any documentation for this via google searches, or in the mongoid.org and the two.mongoid.org websites. Is there someplace I should be looking?

Here is the code:

  has_many_related :food_review do
    def find_or_initialize_by_user_id(user_id)
      criteria.where(:user_id => user_id).first || build(:user_id => user_id)
    end
  end

Thanks!

Upvotes: 1

Views: 227

Answers (2)

Luca G. Soave
Luca G. Soave

Reputation: 12699

Just use has_many instead of has_many_related.

For example :

class User
  include Mongoid::Document
  field :name, type: String
  field ...

  has_many :food_reviews

  def find_or_initialize_by_user_id(user_id)
    criteria.where(:user_id => user_id).first || build(:user_id => user_id)
  end
end

class FoodReview
  include Mongoid::Document
  field ...

  belongs_to :user
end

note the plural has_many :food_reviews and the singular class FoodReview. If you want to refer a singular review, just use has_one :food_review (see Referenced 1-1)

Upvotes: 4

Alon Burg
Alon Burg

Reputation: 2550

Looking at the code of mongoid 2.0 has_many_related is just an alias to has_many:

➜  mongoid  git grep has_many_related
lib/ mongoid/relations/macros.rb:        alias :has_many_related :has_many

Just change it to :has_many and keep the code the same. There's an example of a block given to :has_many in the Mongoid Documentation here

Upvotes: 2

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