Question

I have 2 model:

class User
 include Mongoid::Document
 field :email, :type => String, :null => false, :default => ""
 .
 .
end

class Admin
 include Mongoid::Document
 field :email, :type => String, :null => false, :default => ""
 .
 .
end

I want with a mongoid query find all users have a equal email in Admin model, something like:

User.where(:email => {exist_admin_class?})

This is possible? Or I have make a relationship between two model with a has_one User and belongs_to Admin

What is the best way to do this?

Thank you very much!

Answer 1

Indeed, MongoDB doesnt support cross collection queries. But it isnt necessary, especially not in this requirement. I would suggest using inheritance for that:

mongoid HowTo

Why: Just because admins are a special kind of users.