app/models/user.rb
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 class User
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 	include Mongoid::Document
 
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     embeds_many :accounts, cascade_callbacks: true
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     accepts_nested_attributes_for :accounts
 
     index({ 'accounts.jid' => 1 })
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     def update_pass(jid, pass)
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         account_credentials = accounts.detect do |f|
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             f[:jid] == jid || f['jid'] == jid
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         end
 
         account_credentials[:pass] = pass
         save
     end
 
     def self.existing_jid(jid)
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         where('accounts.jid' => jid).only(:accounts).first
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     end
 
     def self.create_jid(jid)
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         new_user = new()
         new_user.add_account(jid)
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         new_user.save
         new_user
     end
 
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     def add_account(another_jid, password = nil)
         accounts << Account.new(jid: another_jid, pass: password)
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         save
     end
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     def self.crendentials_for_token(token)
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         user = find_by_token(token)
         return user ? user.accounts : []
     end
 
     def self.find_by_token(token)
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         found = Token.where(token: token).only(:user_id).limit(1).first
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         if found
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             return find(found.user_id)
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         else
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             return nil
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         end
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     end
 
     def self.can_save_conversation(my_jid, friend_jid, chat_id = nil)
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         if chat_id.blank?
             found = User.where('accounts.jid' => my_jid)
                         .elem_match('accounts.conversation_settings' => {jid: friend_jid, value: 0})
         else
             found = User.where('accounts.jid' => my_jid)
                         .elem_match('accounts.conversation_settings' => {chat_id: chat_id, value: 0})
         end
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         found.first.nil?
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     end
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 end