Rails - Nested loop not working

Question

Each subject has many pages and each page has many versions. On the show subject page for the owner of that subject, I want the user to be able to update all the pages and versions on that page. However, I get this error:

undefined method `versions' for nil:NilClass

My show page:

%h1
  = @subject.title
%h3 Subject Synopsis
%p
  = @subject.synopsis

- @subject.pages.each do |p|
    %h6
      = p.number
      = ": " + p.title
    %p
      = p.synopsis
    %table
      %tbody
        - p.versions.each do |v|
          %tr
           %td v.number
           %td v.create_at
    = render 'versions/form'

Versions form:

= simple_form_for [@page, @page.versions.build] do |f|
  = f.input :number, placeholder: 'Number', label: false
  = f.text_area :content, placeholder: 'Content', label: false
  = f.button :submit

There is none for pages because the pages don't contain the content — Raymond R
– Raymond R, Commented Mar 2, 2016 at 6:09

Nirajan Pokharel · Accepted Answer · 2016-03-02 05:04:07Z

2

- @subject.pages.each do |p|
        %h6
          = p.number
          = ": " + p.title
        %p
          = p.synopsis
        %table
          %tbody
            - p.versions.each do |v|

answered Mar 2, 2016 at 5:04

Nirajan Pokharel

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2 Comments

Vrushali Pawar Over a year ago

what is the difference between your code and the code which is pasted in question?

Nirajan Pokharel Over a year ago

the question has been updated since i posted this answer

Raymond R · Accepted Answer · 2016-03-02 10:52:30Z

0

I wasn't passing through the loop variable. Answer is:

= render 'versions/form', p: p


= simple_form_for [p, p.versions.build] do |f|

answered Mar 2, 2016 at 10:52

Raymond R

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