gistfile1.txt

class Listing < ActiveRecord::Base
  belongs_to :user

  def get_availability
    if user.active_phone_number && user.outgoing_call_session.nil? && user.incoming_call_session.nil? && (self.active == true)
      return :online
    elsif user.outgoing_call_session || user.incoming_call_session
      return :busy
    else
      return :offline
    end
  end

  def update_availability
    status = get_availability
    if self.availability_status != status
      self.availability_status = status
      save
    end
  end
end

class User < ActiveRecord::Base
  has_many :listings, :order => "position", :dependent => :destroy
  has_one :outgoing_call_session, :class_name => "CallSession", :foreign_key => "client_id"
  has_one :incoming_call_session, :class_name => "CallSession", :foreign_key => "vendor_id"
  belongs_to  :active_phone_number, :class_name => "PhoneNumber", :foreign_key => "active_phone_number_id"

 def get_availability
    if active_phone_number && outgoing_call_session.nil? && incoming_call_session.nil? && !listings.first(:conditions => "active = true").nil?
      return :online
    elsif outgoing_call_session || incoming_call_session
      return :busy
    else
      return :offline
    end
  end

  def update_availability
    status = get_availability
    if self.availability_status != status
      self.availability_status = status
      save
    end
  end
end

class CallSession < ActiveRecord::Base
  belongs_to :listing
  belongs_to :transaction
  belongs_to :client, :class_name => 'User', :foreign_key => 'client_id'
  belongs_to :vendor, :class_name => 'User', :foreign_key => 'vendor_id'
end