Problem with dynamic selects

rubyonrails-talk
1

I'm trying to create dynamic select menus for my application. I have a partial that is rendered by an action in my site controller after an :onchange event is triggered. I'll post the three pieces of code and the error I keep getting.

*_models.html.haml* - if models   = collection_select :model_id, models, :id, :name, {:prompt => "Select Model"}

*site_controller.rb* def update_models   # update models in dynamic select boxes   make = Make.find(params[:make_id])   models = make.models

  render :update do |page|     page.replace_html 'models', :partial => 'models', :object => models   end end

*browse.html.haml* .form_row   = form.collection_select :make_id, Make.find(:all), :id, :name, {:prompt => "Select Makes"}, {:onchange => "#{remote_function(:url => {:action => "update_models"}, :with => "'make_id='+value")}"} .form_row#models   = render :partial => 'models', :object => @models

And from my log:

Processing SiteController#update_models (for 127.0.0.1 at 2009-05-01 04:41:13) [POST]   Parameters: {"authenticity_token"=>"aOem8MBQboKI/e+KdHjNKgm2DvIQYFCyk14o6TtCj/w=", "make_id"=>"1"} Asked for a remote server ? true, ENV["FERRET_USE_LOCAL_INDEX"] is nil, looks like we are not the server Will use local index. using index in C:/Users/Bradley/Documents/Aptana Studio/GreenYard_003/index/development/make default field list: [:name]   e[4;35;1mMake Columns (13.0ms)e[0m e[0mSHOW FIELDS FROM `makes`e[0m   e[4;36;1mMake Load (1.0ms)e[0m e[0;1mSELECT * FROM `makes` WHERE (`makes`.`id` = 1) e[0m Asked for a remote server ? true, ENV["FERRET_USE_LOCAL_INDEX"] is nil, looks like we are not the server Will use local index. using index in C:/Users/Bradley/Documents/Aptana Studio/GreenYard_003/index/development/model default field list: [:name]

ActionView::TemplateError (undefined method `map' for :id:Symbol) on line #2 of app/views/site/_models.html.haml: 1: - if @models 2: = collection_select :model_id, @models.name, :id, :name, {:prompt => "Select Model"}

    app/views/site/_models.html.haml:2:in `_run_haml_app47views47site47_models46html46haml_locals_models_object'     haml (2.0.9) lib/haml/helpers/action_view_mods.rb:14:in `render'     app/controllers/site_controller.rb:46:in `__instance_exec0'     app/controllers/site_controller.rb:45:in `update_models'     haml (2.0.9) lib/sass/plugin/rails.rb:19:in `process'     c:/ruby/lib/ruby/1.8/webrick/httpserver.rb:104:in `service'     c:/ruby/lib/ruby/1.8/webrick/httpserver.rb:65:in `run'     c:/ruby/lib/ruby/1.8/webrick/server.rb:173:in `start_thread'     c:/ruby/lib/ruby/1.8/webrick/server.rb:162:in `start'     c:/ruby/lib/ruby/1.8/webrick/server.rb:162:in `start_thread'     c:/ruby/lib/ruby/1.8/webrick/server.rb:95:in `start'     c:/ruby/lib/ruby/1.8/webrick/server.rb:92:in `each'     c:/ruby/lib/ruby/1.8/webrick/server.rb:92:in `start'     c:/ruby/lib/ruby/1.8/webrick/server.rb:23:in `start'     c:/ruby/lib/ruby/1.8/webrick/server.rb:82:in `start'     -e:2:in `load'     -e:2

Rendered rescues/_trace (193.0ms) Rendered rescues/_request_and_response (1.0ms) Rendering rescues/layout (internal_server_error) es/_request_and_response (1.0ms) Rendering rescues/layout (internal_server_error)   e[4;35;1mSQL (1.0ms)e[0m e[0mSET NAMES 'utf8'e[0m   e[4;36;1mSQL (0.0ms)e[0m e[0;1mSET SQL_AUTO_IS_NULL=0e[0m

Any suggestions? Thanks!

2

Hi, can you verify parameters to collection_select. Are they proper?

Regards, gaurav

3

gaurav v bagga wrote:

Hi, can you verify parameters to collection_select. Are they proper?

Regards, gaurav

On May 1, 2:19�pm, Bradley Herman <rails-mailing-l...@andreas-s.net>

After doing some testing, it would appear Rails is just having a major problem with my partial. The parameters are fine, but something about having that code in a partial is throwing it off. When I replace the current stuff with the exact same code that I have in my browse.html.haml layout, it messes up and gives me weird errors about arguments...

wrong number of arguments (0 for 1)

Extracted source (around line #4):

1: - if @models 2: = form.collection_select :model_id, @models, :id, :name, :prompt => "Select Model" 3: - else 4: = form.collection_select :model_id, Model.find(:all), :id, :name, {:prompt => "Select Model"}

If I leave "form." off, I get the "undefined method :map for :id:Symbol error" still.

4

Okay I solved that, partially. I needed to pass :locals => {:form => form} from my view when first rendering the partial. The problem is, though, that on the :onchange event, the partial is rendered through the controller, so I can't pass :locals from there. So after the :onchange event, I get the same error with the form.collection_select throwing a "Wrong number of arguments 0 for 1" error.