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ActiveRecord caching in controller and model

user41994
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user41994 Published in September 19, 2018, 9:46 am

If I do a query in Model, would the result be cached like it does in the controller?

model User < ActiveRecord::Base
  has_many :emails, through: :memberships

  def emails?
    emails.exists?
  end
end

If it doesn't cache the result, would changing from exists? to present? or any? make any better?

share|improve this question
  • The answer here is association loading - not caching. If you loaded the record with @user = User.eager_loads(:emails).find(1) then AR is usually smart enough to not issue a query if you stick with size or any?, empty?. .exists? is a query method an will create a separate query AFAIK. – max Apr 17 at 12:58

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