CODEWITHSUNDEEP
ruby-on-railsrubyactiverecordassociations
Arel
Arel

Reputation: 3938

check existence of record on user in an associated model

I have a user that has_many associations. Associations has a provider field. I want to check if a user has a provider. If provider were a field on the user table I would just do provider.blank? How do I do the same check when reaching through a has_many association?

EDIT:

class User < ActiveRecord::Base

  has_many :authentications

end

class Authentications < ActiveRecord::Base

  belongs_to :user

end

Authentications table has the following fields

:provider
:user_id
:uid
:id

Upvotes: 1

Views: 29

Answers (1)

Stuart M
Stuart M

Reputation: 11588

You can check if any of the user's Authentications contain providers using the following:

user.authentications.any? {|a| a.provider }

any? iterates over the Array and returns true if the block returns true when passed each element of the Array. When the Array is empty (i.e., no Authentications) it returns false.

Upvotes: 2

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