Screencast: Formulare mit verschachtelten Modellen

Download:

Download (22.4 MB, 11:09) Alternativer Download für iPod & Apple TV (15.2 MB, 11:09)

Resourcen:

• accepts_nested_attributes_for
• Nifty Generators
• Nested Model Forms Blog Post
• Full Episode Source Code

Quellcode:

[bash] rails surveysays script/generate nifty_layout script/generate nifty_scaffold survey name:string script/generate model question survey_id:integer content:text script/generate model answer question_id:integer content:string rake db:migrate [/bash]

[ruby] # models/survey.rb class Survey < ActiveRecord::Base has_many :questions, :dependent => :destroy accepts_nested_attributes_for :questions, :reject_if => lambda { |a| a[:content].blank? }, :allow_destroy => true end

# models/question.rb class Question < ActiveRecord::Base belongs_to :survey has_many :answers, :dependent => :destroy accepts_nested_attributes_for :answers, :reject_if => lambda { |a| a[:content].blank? }, :allow_destroy => true end

# models/answer.rb class Answer < ActiveRecord::Base belongs_to :question end

# surveys_controller.rb def new @survey = Survey.new 3.times do question = @survey.questions.build 4.times { question.answers.build } end end [/ruby]

[html] <% form_for @survey do |f| %> <%= f.error_messages %>

<%= f.label :name %>
<%= f.text_field :name %>

<% f.fields_for :questions do |builder| %> <%= render “question_fields”, :f => builder %> <% end %>

<%= f.submit “Submit” %>

<% end %>

<%= f.label :content, "Question" %>
<%= f.text\_area :content, :rows => 3 %>
<%= f.check\_box :\_destroy %> <%= f.label :\_destroy, "Remove Question" %>

<% f.fields\_for :answers do |builder| %> <%= render 'answer\_fields', :f => builder %> <% end %>

<%= f.label :content, "Answer" %> <%= f.text\_field :content %> <%= f.check\_box :\_destroy %> <%= f.label :\_destroy, "Remove" %>

\[/html\]