ruby on rails - why am i getting method undefined? -

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I'm trying to call a view from a model but I get this error 

  undefined method # titles_by_timing for the title category: 0x0000010668db28 & gt;   
 Why can not I get a call from Rail Console too?  
  [6] Pv (main)> DeliveryCost.titles_by_timing NoMethodError: 'titles_by_timing' category for the exception # method #class: 0x00000106f397b8 & gt; /Users/user/.rvm/gems/ruby-2.1.0/gems/activerecord-4.0.4/lib/active_record/dynamic_matchers.rb22: From   
 Here Model is.  
  Class Delivery Cost & lt; ActiveRecord :: Base Phle_steroy: Jivit_if_jobs Ha_maya: Naukri_dilavijn_costs Ha_maiyan: jobs, the job :: _ Dilivri_ through costs DRT Kitab_ Bay_timing Swynkdo end stuff private Diif survive_if_jobs jobs.empty?   
 The view I am trying to call it does not correspond directly to the model or controller, its name is 'job delivery cost'.  
  - jdc_array = (@ job.job_delivery_costs.any ?? [@ Job.job_delivery_costs, @job_delivery_cost] Fletn: [@job_delivery_cost]) - jdc_array.each do | Jdc = Simple for_form_ :: administrator, @job, jdc] = | F | - If jdc.new_record? % Tr% td = f.input: delivery_cost_id, Collection: Delivery cost. Order (: Timing) ,: label_method = & gt; : Timing ,: value_method = & gt; : ID, Label: Wrong% td = f.select: title, grouped_options_for_select (DeliveryCost.titles_by_timing)% td = f.input: cost_per_unit, label: false% td = f.input: hour_count, label: false% td = f. Input: quantity, label: wrong% td = f.submit "add", class: "btn btn-s btn-default"   
 but should it not make any difference? Its very disappointing   
 
 
 You  titles_by_timing  is defined in the  For example < / Em>  and trying to use it as the  class method  that is causing an error.  
 If you do it  class method  like  DeliveryCost.titles_by_timing  you should define it as follows:  
  Def self.titles_by_timing ## Prefix with self. End of content stuff   
 -OR-  
 If you want to use the  titles_by_timing  method, the way it is defined now For example:  
  DeliveryCost.find (1 A method of calling should be called .titles_by_timing

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