Creating Many Models in One Form (Page 2 of 3)

Since you only have one entry record to start off with you can use index to 1:

<%= render :partial => 'add_image_link', :locals => { :index => 1 } %>

However, there's a problem. If there's a validation error it won't work the way you expect because it will go back to only 1 record again.

To solve this, you need to go back to thinking about having many property_images, even though you only have one to start off with. Since you don't have a parent model to reach through you'll have to make your own array of models:

def new # or whatever you like to name it
  @property_images = [PropertyImage.new]
end
def create
  @property_images = params[:property_images].each_value { |property_image| Property.new(property_image) }
  #...
end

This last problem from stevepsharpe is great, but I have trouble understand the full solution.  I would like to do "n" models in one form and let the user add as many models as needed.  One user may have need for one model.  Another user may have need for twenty models.  In this case, creating models on the fly makes more sense.  Is there an article on creating n models in one form?

Is there any reason why brackets are used for tasks[#index] or could I use any other character ?

# in projects/new.rhtml
 <% @project.tasks.each_with_index do |task, index| %>
   <% fields_for "tasks[#{index}]", task do |f| %>
   <p><%= f.text_field :name %></p>
   <% end %>
 <% end %>

id="some_model[1]_volume"

Using brackets gives me XHTML invalid id's and makes the id's different from the ones I get when looping over existing record like in ...fields_for "tasks[]", which returns me

id="simulation_transactions_566_volume"

Is it possible just using an underscore "tasks_#index" ?

Thanks for clarifying, I forgot to check the name attribute which also gets modified...

This already helps me.

Cheers,
Michael

I've been following this tutorial.  Great stuff.  Now, I am getting the following error on my index page:

"undefined method `quizanswer' for Quizquestion:Class"

also relevant is the location:

"#{RAILS_ROOT}/app/controllers/quiz_controller.rb:10:in `list'
#{RAILS_ROOT}/app/controllers/quiz_controller.rb:4:in `index'"

Here is my code from the quiz_controller:

  def index
    list
    render :action => 'list'
  end
  
  def list
    @quizquestion = Quizquestion.find(:all)
    @quizanswer = Quizquestion.quizanswer.find(:all)
  end
  
  def new
    @quizquestion = Quizquestion.new
    5.times { @quizquestion.quizanswers.build }
  end
  
  def create
    @quizquestion = Quizquestion.new(params[:quizquestion])
    params[:quizanswers].each_value do |quizanswer|
      @quizquestion.quizanswers.build(quizanswer) unless quizanswer.values.all?(&:blank?)  
    end
    if @quizquestion.save
      redirect_to :action => 'index'
    else
      render :action => 'new'
    end
  end
end

Last edited by ravvuinn (2007-07-17 18:06:02)

Is there a way to create multiple models through the child?

For example I want to create an order, that belongs to an organization (which also has deadlines and other things), and I'd like to create them at the same time and I want to use the order model because it ties together all the other attributes and models.

The posted tutorials seem to only allow for the creation of multiple models if you use the parent model's new action.

I don't think that's what I'm talking about.

Let's say that instead of task belongs_to :project, project belongs_to :task.  Is it still possible to create and update both projects and tasks using  projects/new.rhtml as defined in projects_controller.rb?

Or does this have to be done in tasks/new.rhtml and tasks_controller.rb?

Does that make sense?

Since this tutorial only covers the creation process, I recommend making a separate thread for this problem and state specifically what isn't working.

I would like to allow the user to add any number of "people" to an existing "household" --- from the show action of the household.

I am attempting to use the partials from Ryan's tutorial on adding any number of associated models when a new parent model is created. That works fine. Looking for help with adding associated records after the parent record is created.

Here is my code (which doesn't work):

 
households/show.rhtml
<%= render :partial => "add_person_link", :locals => { :index => 1} %>
    <% form_tag :action => 'add_people', :household_id => @household do %>
         <%= render :partial => 'person_fields', :locals => { :index => 1 } %>
    <%= submit_tag "Add to Household" %>
    <% end %>
households/_person_fields.rhtml
<div id="person_<%= index %>">
 <% fields_for "people[#{index}]", person do |f| %>
<table border="0" cellspacing="1" cellpadding="1">
    <tr>
        <td>First Name: </td>
        <td><%= f.text_field :first_name %></td>
        <td>Last Name: </td>
        <td><%= f.text_field :last_name %></td>
    </tr>
...more fields...
</table>
   <p>
     <%= link_to_remote 'remove', :url => { :action => 'remove_person', :index => index } %>
   </p>
 <% end %>
 </div>

`@people[1]' is not allowed as an instance variable name