I just wanted to follow up with my simple (maybe obvious) solution....
> <% form_for @message_thread do |thread_form| -%>
> <% thread_form.fields_for :messages do |message| %>
<% if message.object.new_record? %> # The magic!
> <%= message.label :message %>
> <%= message.text_field :message %>
<% end %>
> <% end %>
Duh! If there's a smarter way, I'm still listening.
On May 12, 4:43 am, Guitaronin <[email protected]> wrote:
> I'm trying to build something similar to a Facebook messaging app, in
> which the view displays all the messages for a particular thread, with
> a form box for replying at the bottom of the thread.
>
> The problem is that using fields_for generates form fields for each
> existing record, and for one new record. In this case, there is no
> need to edit existing messages - just a need to add new messages.
>
> Does anybody know how to do this? Code is below.
>
> Models:
> class MessageThread < ActiveRecord::Base
> has_many :messages
> accepts_nested_attributes_for :messages, :allow_destroy => true
> end
>
> class Message < ActiveRecord::Base
> belongs_to :message_threads
> end
>
> View (show.html.erb)
>
> <% @message_thread.messages.each do |message| %>
> <%= message.message %>
> <% end %>
>
> <% form_for @message_thread do |thread_form| -%>
> <% thread_form.fields_for :messages do |message| %>
> <%= message.label :message %>
> <%= message.text_field :message %>
> <% end %>
>
> <%= submit_tag 'Send Message' %>
> <% end -%>
>
> Thanks.
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