Mongoid: search in has_many relation - ruby-on-rails

Question

I'm using mongoid, and have the following code:
class Users::User
include Mongoid::Document
field :username, type: String
has_many :emails, class_name: "Users::Email"
end
class Users::Email
include Mongoid::Document
field :email, type: String
belongs_to :user, class_name: "Users::User", inverse_of: :emails
end
database:
#users collection
{
"_id" : ObjectId("5162de8a359f10cbf700000c"),
"username" : "bilbo"
}
#emails collection
{
"_id" : ObjectId("5162de8a359f10cbf700000b"),
"email" : "bilbo#jenkins.com",
"user_id" : ObjectId("5162de8a359f10cbf700000c"),
}
I'm trying to find with the following query:
Users::User.includes(:emails).any_of({username: login},{"emails.email"=> login}).first
and I don't know why, but this query ignoring search in emails relation.
When login = "bilbo" => true, but when login = "bilbo#jenkins.com" => nil
So, what I'm doing wrong?

Answer 1

You need a join to do what you're trying to do and Mongoid doesn't have joins. If you only need to access the emails through a user, you could denormalize them and embed them in Users::User.
class Users::User
include Mongoid::Document
field :username, type: String
embeds_many :emails, class_name: "Users::Email"
end
class Users::Email
include Mongoid::Document
field :email, type: String
embedded_in :user, class_name: "Users::User", inverse_of: :emails
end
That way, you can query on a user's emails:
irb(main):011:0> login = "bilbo#jenkins.com"
=> "bilbo#jenkins.com"
irb(main):012:0> Users::User.any_of({username: login},{"emails.email"=> login}).first
=> #<Users::User _id: 5163ee96e44f7b0301000001, username: "bilbo">
If Users::Email's only property is email you could go even a step further and omit the model completely and store the string in an array:
class Users::User
include Mongoid::Document
field :username, type: String
field :emails, type: Array
end
Querying gets even easier:
Users::User.any_of({username: login},{"emails"=> login}).first
=> #<Users::User _id: 5163ef95e44f7b6254000001, username: "bilbo", emails: ["bilbo#jenkins.com"]>