Complex Forms (From Railscasts.com)

rubyonrails-talk
1

Hi,

I have been watching the last three episodes on railscasts.com in which he goes through dealing with multiple models in one for using fields_for, and virtual attributes. (Ruby on Rails Screencasts - RailsCasts 73). Here is an example of the way they suggest to go about it:

# projects_controller.rb def new   @project = Project.new   3.times { @project.tasks.build } end

def create   @project = Project.new(params[:project])   if @project.save     flash[:notice] = "Successfully created project."     redirect_to projects_path   else     render :action => 'new'   end end

# models/project.rb def task_attributes=(task_attributes)   task_attributes.each do |attributes|     tasks.build(attributes)   end end

VIEW <!-- new.rhtml --> <% form_for :project, :url => projects_path do |f| %>   <p>     Name: <%= f.text_field :name %>   </p>   <% for task in @project.tasks %>     <% fields_for "project[task_attributes]", task do |task_form| %>       <p>         Task: <%= task_form.text_field :name %>       </p>     <% end %>   <% end %>   <p><%= submit_tag "Create Project" %></p> <% end %>

This example uses a one to many relationship. (they go further in future episodes, but for now this will be fine). My issue is that I would like to do this over multiple relationships. For example: what if a task had multiple requirements? How can I do this with still only calling Project.new(params[:project]) and having everything still set automatically?

Thanks for you help!

2

Alright, I think I have the issue figured out. In your example, i think you have 1 too many sets of braces.

For the example above, if a task had multiple requirements, your view would look something like the following for the requirements:

<% for requirement in @project.task.requirements %> <% fields_for "project[task_attributes][requirement_attributes]", requirement do |requirement_form| %> <p> Requirement: <%= requirement_form.text_field :name %> </p> <% end %> <% end %>

Then in the task model:

def requirement_attributes=(requirement_attributes)    requirement_attributes.each do |attributes|       self.requirements.build(attributes)    end end

This seems to work.