CODEWITHSUNDEEP
ruby-on-railsinheritancemongoidreverse
Guido
Guido

Reputation: 387

Mongoid inheritance without changing collection

I have been using rails and mongoid and have the following models (as an example):

class SocialMedia
end

class Facebook < SocialMedia
    include Mongoid::Document
    field :fans
end

class Instagram < SocialMedia
    include Mongoid::Document
    field :fans
end

I wanted to move both "fans" fields from Facebook and Instagram to SocialMedia class (inherited) WITHOUT changing collections. If I do something like:

class SocialMedia
    include Mongoid::Document
    field :fans
end

I end up with a new collection called social_media with _type: being either facebook or instagram. Since this database is already quite huge, it is not an option to update that.

Any ideas?

Upvotes: 2

Views: 1425

Answers (2)

max
max

Reputation: 102250

The collection for the model's documents can be changed at the class level if you would like them persisted elsewhere. - http://mongoid.org/en/mongoid/v3/documents.html

class SocialMedia
  include Mongoid::Document
  field :fans
end

class Facebook < SocialMedia
  store_in collection: "facebook"
end

class Instagram < SocialMedia
  store_in collection: "instagram"
end

Or 

class SocialMedia
  include Mongoid::Document
  field :fans
  store_in collection: model_name.plural
end

Upvotes: 0

panmari
panmari

Reputation: 3837

You can do that using concerns. Create a concern like this

module Sociable
  extend ActiveSupport::Concern
  included do
    field :fans
  end
end

And then include this module in both your models.

Upvotes: 2

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