Question

I am having a very strange problem, I have this file for User#show view:

%h1 My Appliances
.floatright= link_to "Add appliance", new_appliance_profile_path
%table
  %tr
    %th Category
    %th Manufacturer
    %th Model
    %th Room
    %th Hours On
    %th Hours Sleeping
    %th
  - @user.appliance_profiles.each do |ap|
    %tr{:class => cycle('list_line_odd', 'list_line_even')}
      %td= ap.appliance.category
      %td= ap.appliance.manufacturer
      %td= ap.appliance.model
      %td= ap.room.name
      %td= ap.hours_on
      %td= ap.hours_sleep
      %td= link_to "edit", edit_appliance_profile_path(ap)

and receive the error: undefined method 'category' for nil:NilClass

My model does have a category string attribute. What does this mean and how do I fix it?

Answer 1

It means that in this call:

%td= ap.appliance.category

appliance is nil. If it’s OK that not all appliance_profiles have an appliance, you can do this:

%td= ap.appliance.try(:category)

If all the appliance_profiles should have an appliance, you have to check your database for missing data.