Hi I am also struck at the same point please help me ... same problem u r facing sandeep On Aug 11, 6:50 am, Mark Thomas <[email protected]> wrote: > 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-"} %>
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