Hello -
I am fairly new to Ruby on Rails, but feel like I am learning quick. I have what seems to be a fairly unique issue as I cannot find much out there that describes what I'm seeing. Hopefully it's a very simple fix, and I simply can't see the forest through all the trees!
I am attempting to create 2 related drop-down lists in the same form_for, both using collection_select. On the first drop-down, I have an onChange "remote_function" call that I want to send an AJAX call to the controller and filter the list in the 2nd drop-down based on what was selected in the first. In the controller method, I then call page.replace_html to render a partial. In the partial is the "updated/filtered" 2nd collection_select drop- down list.
The remote_function works fine and calls the Controller method when the first drop-down changes. I am also able to pass the selected value to the method and filter the records returned. The problem occurs when the controller attempts to render the partial, I get the following error:
ActionView::TemplateError (undefined local variable or method `f' for #<ActionView::Base:0xb6e7b2f4>) on line #1 of app/views/listings/ _automodels.html.erb: <%= f.collection_select :model, @automodels, :model, :model, {:prompt => "-Select a Make First-"} %>
This leads me to believe that the "f" variable the rest of the fields in the form_for are using is not available to the newly-replaced "collection_select", but I'm not sure why?
If the partial contains a simple HTML <input> instead of the collection_select, the replace_html works fine.
Source code is worth 1,000 words, so here it is:
listings/new.html.erb
1. <% form_for([@user, @listing]) do |f| %> 2. <%= f.error_messages %> 3. <p> 4. <%= f.label :make %><br /> 5. <%= f.collection_select :make, @automakes, :make, :make, {:prompt => "-Select a Make-"}, {:onChange => remote_function(:url => {:action => 'get_automodels'}, :with => "'make=' + this.value")} %> 6. </p> 7. <p> 8. <%= f.label "Model:" %><br/> 9. <div id='automodelsdiv'> 10. <%= f.collection_select :model, @automodels, :model, :model, {:prompt => "-Select a Make First-"} %> 11. </div> 12. </p> 13. <p> 14. <%= f.submit 'Create' %> 15. </p> 16. <% end %>
listings_controller.rb
1. def get_automodels 2. @automodels = Automodels.find_by_make(params[:make]) 3. render :update do |page| 4. page.replace_html('automodelsdiv', :partial => 'automodels') 5. end 6. end
_automodels.html.erb
1. <%= f.collection_select :model, @automodels, :model, :model, {:prompt => "-Select a Make First-"} %>
