Rails: Building a Multi-Model Form

Question

I have a form that save a question and five answers in the database but I don't know how I can save the answers, this is my form:

<%= form_for([:admin, @question]) do |f| %>

...

<%= f.fields_for :answers do |builder| %>
    <%= builder.label :answer, "Risposta", :class => "v-align" %>
    <%= builder.text_field :answer, :rows => 2 %>

    <%= builder.label :correct, "Corretta", :class => "v-align" %>
    <%= builder.check_box :correct %>
<% end %>

...

<% end %>

My models:

class Question < ActiveRecord::Base
    has_many :answers
    accepts_nested_attributes_for :answers, :reject_if => lambda { |a| a[:content].blank? }, :allow_destroy => true
    attr_accessible :answers_attributes, :quiz_id, :question, :sort_order, :point_value, :number_correct, :explanation
end

class Answer < ActiveRecord::Base
    belongs_to :question
    attr_accessible :question_id, :answer, :correct, :sort_order
end

And my "Question" controller:

def new
    @question = Question.new
    5.times { @question.answers.build }

    respond_to do |format|
        format.html # new.html.erb
        format.json { render :json => @question }
    end
end

def create
    @question = Question.new(params[:question])

    respond_to do |format|
        if @question.save
            format.html { redirect_to admin_question_path(@question), :notice => 'Test was successfully created.' }
            format.json { render :json => @question, :status => :created, :location => @question }
        else
            format.html { render :action => "new" }
            format.json { render :json => @question.errors, :status => :unprocessable_entity }
        end
    end  
end

What I should do to save question and answer in the database?

Thanks!!

apneadiving · Accepted Answer · 2011-12-06 18:55:32Z

3

You only miss accepts_nested_attributes_for :answersin the Question model.

See doc.

EDIT:

You should add answers_attributes to your attr_accessible list

edited Dec 6, 2011 at 18:55

answered Dec 5, 2011 at 22:34

apneadiving

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7 Comments

Mark Design Over a year ago

Ops, I have it in the model but I miss it in this question... sorry!!

apneadiving Over a year ago

a mere @question.save should be ok. But proceed as done in scaffolding to handle errors. See guides.rubyonrails.org/getting_started.html#creating-new-posts

Mark Design Over a year ago

No, nothing... with @question.save I can save the question but I can't save the answers...

apneadiving Over a year ago

Did you set some attr_accessible?

Mark Design Over a year ago

yes but I still can't save answers... I think that I have to write something in the create action of question controller...

|

jipiboily · Accepted Answer · 2011-12-06 19:36:55Z

1

You should take a look at two RailsCasts:

http://railscasts.com/episodes/196-nested-model-form-part-1 and http://railscasts.com/episodes/197-nested-model-form-part-2

They might help you a lot!

The man behind those casts, Ryan Bates, created a great gem to handle nested forms!

answered Dec 6, 2011 at 19:36

jipiboily

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