gistfile1.rb

class SearchReport < ActiveRecord::Base
  
  belongs_to :user
  belongs_to :report, :polymorphic => true
  
end

class User < ActiveRecord::Base
  ...
  has_many :search_reports
  ...
end

class TaskSearch < ActiveRecord::Base
  ...
  has_many :search_reports, :as => :report
  ...
end

class LeadSearch < ActiveRecord::Base
  ...
  has_many :search_reports, :as => :report
  ...
end

class One::BackendUser < ActiveRecord::Base
  
  self.abstract_class = true
  ...
  has_many :search_reports, :through => :user
  has_many :task_reports, :through => :user, :source => :search_reports, :conditions => ["report_type = 'TaskSearch'"]
  has_many :lead_reports, :through => :user, :source => :search_reports, :conditions => ["report_type = 'LeadSearch'"]
  ...
end


a = Agent.first
a.task_reports # returns task reports