[Rails] Class_eval problem

[mukesh singh]

class AssigneesController < ApplicationController

 def assignees
  @assinees = Assignee.find(:all, :select => "#{params[:assignee_clean_by]},
id").uniq_by(&"#{params[:assignee_clean_by]}".to_sym)
  Assignee.class_eval %Q{
                def assignee_name
                    self["#{params[:assignee_clean_by]}"]
                end
           }
  end

 def do_assignee_cleaning
      Assignee.find(1).assignee_name
      redirect_to
assignee_cleaning_project_assignees_path(params[:project_id])
  end
end


in assignees.html.erb

@assignees.each do |assignee|
  assignee.assignee_name
end

I am able to call assignee_name method on assignee object in
assignees.html.erb.
But in do_assignee_cleaning action, i get error undefined method
`assignee_name' for #<Assignee:0xc306ac> why?

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