I've tried to apply this example to my application without much luck. I'd like to create a form with multiply records. The parent records are already created and now need to be able to add N number of child records from a single form (tabular format, 5 columns per row).

The examples show this processing through the parent (project) controller - how would this be approached if going through the child controller?

I'm currently using rails 2.3.2

------------------- Thrown Exception --------------------------------------
Showing app/views/timeslips/_newform.html.erb where line #16 raised:

undefined method `each_with_index' for #<Timeslip:0xb6e1619c>

Extracted source (around line #16):

13:   <p>
14:   <h2>Timeslips</h2>
15:   <div id="timeslips">
16:     <% @timeslip.each_with_index do |timeslip, index| %>
17:       <%= render :partial => 'timeslip_fields', :locals => { :timeslip => timeslip, :index => index } %>
18:     <% end %>
19:   </div>

http://jamesgolick.com/2008/7/28/introd … ready-know

Lots of the logic and RJS that Ryan describes could easily be modified to work with ActivePresenter as well.  It doesn't support building multiple child model records yet but that will soon be supported (which is a major point of this tutorial).  But the promise is there.

Just wanted to extend a huge thank you. I'm just beginning with rails and this tutorials you've made about forms were just what I needed. Again, Thank You!

I am running into a strange problem where every time I edit two models in one form, and hit the Update button, I get the error :
No route matches "/obligation/update" with {:method=>:post}

I have 2 models : obligation and assignment.

obligation has_many :assignments and assignment belongs_to :obligation

I have changed the update def code and modified the edit file but dont know why it is not working out.

Please help me out with it!

Thanks for your tutorial(looks that made it to Advanced Rails Recipe ). I had a look at it and it's much more simpler than the original post.

I have a small problem:
My "tasks" is added fine and it looks nice. But I want to use a in_place_editor_field inside my fields_for for every "task" but I get the error:

"ActionView::TemplateError (undefined method `in_place_editor_for' for #<ActionView::Helpers::FormBuilder:0x244620c>)"

Can I patch the ActionViewHelper in some way or is there a workaround or an other way?

#it will loop n person i have in table person.
#day will be entered manually using drop down/text field.

Person | shift_day
john   | monday
doe    | tuesday
dann   | wednesday
rob    | thursday
carl   | friday

(save shift)

i want to know if i click (save shift) it will save that 5 new records in shift table.

by the way,
this is what in the table person: id, name
this is what in the table work_shift: person_id, shift_day

i tried this tutorial before in my other project. in 1 form, it will add 2 records. 1 record in user table and 1 record in student table. (work like a charm, thank you!)
e.g.
user - id = 1, name = john
student - id = 1, user_id = 1

THANK YOU SO MUCH, I APPRECIATE YOUR HELP

 <% fields_for "lessons_edited[#{lesson}][assignments][#{index}]", assignment do |assignment_form| %>
...stuff here...
<% end %>

Now my problem...

The assignment form consists of dynamic drop-downs updated with observe_field. So, the final partial which is used to select the 'segment_id' for the assignment isn't working as I would expect/hope. The 'assignment_form' method from the form builder block doesn't seem to like my select control... neither collection_select nor select. When I use...

 assignment_form.text_field :segment_id

When I use...

 assignment_form.select :segment_id, @segments.collect {|s| [s.id, s.full_name]}

ActionView::TemplateError (wrong number of arguments (3 for 0)) on line #3 of app/views/lessons/_segments.rhtml:
...
3: <%= assignment_form.select :segment_id, @segments.collect {|s| [s.id, s.full_name]}, {} %>

assignment_form.collection_select :segment_id, @segments, :id, :full_name

ActionView::TemplateError (undefined method `collection_select' for "#<ActionView::Helpers::FormBuilder:0x3461d80>":String) on line #3 of app/views/lessons/_segments.rhtml:
...
3: <%= assignment_form.collection_select :segment_id, @segments, :id, :full_name %>

I have a form which edits many instances of a "lesson" model and (hopefully) will add any number of "assignments" to any lesson.

<% form_remote_tag :url => {:action => 'update_assignments', :student => @student, :week => @set_week} do |f| %>

<% for lesson in lessons_day_subject %>
  <% fields_for "lessons[#{lesson.id}]", lesson do |f| %>
  ...lesson fields here...    
  <% lesson.assignments.each_with_index do |assignment, index| %>
    <%= render :partial => 'assignment_fields', :locals => { :assignment => assignment, :index => index, :subject => @subject.id, :lesson => lesson } %>
    <% end %>
                    
<%= submit_tag 'Save All' %>
<% end %>
#assignment_fields partial...
#this is what I don't get!
<% fields_for "assignments[#{index}]" do |assignment| %>
  ...assignment fields here...
<% end %>

"
"lessons"=>{"172"=>{"comments"=>"comments here", "assignments"=> {"0"=> {"lesson_id" => "213", "segment_id"=>"78"}, {"1" => {"lesson_id"=>"214", "segment_id"=>"79"}}}...

Your help is appreciated.

Using Rails 2.0. When adding another "task", nothing happened and I kept getting the following in development.log:
ActionController::MissingTemplate (Missing template people/add_address.html.erb in view path /home/Scott/track/app/views):

Turns out I didn't notice I need a respond_to in the controller for add_task

# in projects_controller.rb
def add_task
  @task = Task.new
  
  respond_to do |format|
    format.js
  end  
end