[Rails] Class_eval method scope

[mukesh singh]

class AssigneesController < ApplicationController

 def assignees
    Assignee.class_eval %Q{
                def assignee_name
                    self["#{params[:assignee_by]}"]
                end
           }
  end

  def do_assignee_cleaning
      Assignee.assignee_name
      redirect_to
assignee_cleaning_project_assignees_path(params[:project_id])
  end

end

I want to use assignee_name method in do_assignee_cleaning action but i am
getting  error undefined
method `assignee_name' for class `Assignee' in do_assignee_cleaning

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