Nested fields not being created on form

Question

I am trying to get a Project form to build the first (starting) time of several (up to 12) volunteer time blocks.

project.rb

class Project < ActiveRecord::Base
  attr_accessible :title, ...
  has_many :vol_times, :dependent => destroy
  accepts_nested_attributes_for :vol_times, :reject_if => lambda { |a| a[:start_time].blank? }, :allow_destroy => true
  ...
end

vol_time.rb

class Vol_time < ActiveRecord::Base
  attr_accessible :start_time, ...
  belongs_to :project
end

ProjectsController

class ProjectsController < ApplicationController

  before_filter :signed_in_user, only: :create
  ...
  def new
    @project = Project.new
    @user = current_user
    @project.vol_times.build
  end
  ...
end

Vol_Times Controller

class Vol_TimesController < ApplicationController
  def new
    @reward = Reward.new
  end
  ...
end

My view looks like this...

<%= form_for(@project) do |f| %>

<div class="form_field_block">
      <p class="form_label">&nbsp;&nbsp;Project Title</p>
    <%= f.text_field :title, :size => 40, :placeholder => " Project Title...", :class => "frm" %>
</div>
<div class="form_field_block">
  <p class="form_label">&nbsp;&nbsp;Project Sub-title</p>
    <%= f.text_field :sub_title, :size => 40, :placeholder => "  Project Sub-title...", :class => "frm" %>
</div>
<p class="clearing"></p>
<div class="form_field_block">
  <% f.fields_for :vol_times do |builder| %>
    <%= render :partial => 'start_time', :f => builder %>
      <% end %>
</div>    
<p class="clearing"></p>
<%= button_tag "btn_start_project.png", :class => "btn_save" %>
<% end %>

And the _partial looks like this...

<%= f.label :start_time, "Starting Time" %>
<%= f.text_field :start_time %>

When I view the page, I see the containing <div>, but not the contents of the ERB, which should be parsed from the _partial.

Any ideas why this isn't working? I got the general context from Ryan Bates' RailsCast #196 - Here

jvnill · Accepted Answer · 2013-03-06 07:12:11Z

1

you are missing a = on the fields_for. It should be

<%= f.fields_for :vol_times do |builder| %>

answered Mar 6, 2013 at 7:12

jvnill

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3 Comments

Matteo Over a year ago

Thanks, that fixed the generation issue, but now I'm getting NameError in Projects#new undefined local variable or method 'f' for #<#<Class called on the _partial on line #1: 1: <%= f.label :vol_times, "Starting Time" %> <%= f.text_field :vol_times, :size => 20, :placeholder => " Starting Time...", :class => "frm"%>

Matteo Over a year ago

Ok, for those who may follow afterwards, the error in the comments above is due to the inclusion of :partial => in the render. It should read: <%= render 'start_time', :f => builder %>

jvnill Over a year ago

the original syntax for rendering a partial is <%= render :partial => 'start_time', :locals => { :f => builder } %>. What you did is a shortcut and is preferred because it's cleaner. If you need to pass other options like collection and as, you still need to use the original syntax.

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