I am having trouble getting a nested form to work in rails 4.2.0 and ruby 2.2.0. I went back and tried to follow the Railscast from 2010, but even following that example my subfields aren't showing up. What am I doing wrong? Is there a new best practice for nested forms now?
views/surveys/_form.html.erb:
<%= form_for(@survey) do |f| %>
...
<% f.fields_for :questions do |builder| %>
<div class="field">
<%= builder.label :content, 'Question' %><br>
<%= builder.text_area :content, rows: 3 %>
</div>
<% end %>
...
<% end %>
controllers/survey_controller.rb
class SurveysController < ApplicationController
before_action :set_survey, only: [:show, :edit, :update, :destroy]
...
# GET /surveys/new
def new
@survey = Survey.new
3.times { @survey.questions.build }
end
...
private
...
# Never trust parameters from the scary internet, only allow the white list through.
def survey_params
params.require(:survey).permit(:name, questions_attributes:[:content])
end
end
models/questions.rb
# == Schema Information
#
# Table name: questions
#
# id :integer not null, primary key
# survey_id :integer
# content :text
# created_at :datetime not null
# updated_at :datetime not null
#
class Question < ActiveRecord::Base
belongs_to :survey
end
models/surveys.rb
# == Schema Information
#
# Table name: surveys
#
# id :integer not null, primary key
# name :string
# created_at :datetime not null
# updated_at :datetime not null
#
class Survey < ActiveRecord::Base
has_many :questions, dependent: :destroy
accepts_nested_attributes_for :questions
end
I'm guessing that this is something simple, but I've spent too much time now trying to figure it out. Does anyone know why my fields aren't showing up?
Solution:
I forgot to render the subfields (<% instead of <%=). The correct text in _form.rb should be:
<%= f.fields_for :questions do |builder| %>
<div class="field">
<%= builder.label :content, 'Question' %><br>
<%= builder.text_area :content, rows: 3 %>
</div>
<% end %>
