CODEWITHSUNDEEP
rubymongoid
Andrew
Andrew

Reputation: 239017

Mongoid unique children

I'm creating a multi-tenant application and am trying to figure out how to model this relationship with Mongoid. I have a Site model which has_many :domains, or embeds_many, or even uses an array of strings if that will work. I want to validate that only unique domains can be associated (so two Sites can't have the same domain). I also want to be able to find a site by a given domain.

How would I represent this using Mongoid? Also, how would I query for the Site by a given domain?

Upvotes: 0

Views: 84

Answers (1)

Ismael
Ismael

Reputation: 16730

You better go with the has_many association.

In the domain model just do and you will be good. Assuming you want unique domain names, if url just change it.

validates_uniqueness_of :name

If you embed it, you can't do that validation easily, you you need to fetch all site and domains, or keep a different collection with just the domain names to see if it exists. Same for query the site with a given domain. Because you couldn't get the domain, without knowing the site it belongs.

If you do the proper relations as

class Site
  field :name
  has_many :domains
end

class Domain
  field :name
  belongs_to :site
end

You can then do, like in ActiveRecord

some_domain.site

docs: http://mongoid.org/en/mongoid/docs/relations.html#has_many

Upvotes: 1

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