Creating a simple drop-down menu in Rails

Question

This really seems simple enough yet for some reason I'm missing something critical.

I have a view:

<% form_for :foo, @foo, :url => {:action => 'bar'} do |f|%> 
  <%= f.collection_select :range, FooModel::MONTHS%>
  <%= submit_tag "Submit", :disable_with => "Submitting..." %>
<% end %>

I have a model:

class FooModel < ActiveRecord::Base
  MONTHS = ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep']
end

And I have a controller:

def new
  @foo = FooModel.new
end

def index
  respond_to do |format|
    format.html # index.html.erb
  end
end

def bar
  if params[:foo]
    @foos = params[:foo].inspect
  end

  respond_to do |format|
    format.html # index.html.erb
  end
end

My question is, how do I get at the information as to which combo box element had been selected when the Submit button was clicked? It doesn't seem to be params[:foo], @foo, or anything else I can think of.

Update Looking at it it seems like I should maybe be calling params[:range]? That, however, is nil.

Gerry · Accepted Answer · 2012-05-29 05:48:46Z

2

I think your code can be simplified to work this way:

<% form_for @foo, :url => {:action => 'bar'} do |f| %>
  <%= f.select :range, FooModel::MONTHS %>
  <%= submit_tag "Submit", :disable_with => "Submitting..." %>
<% end %>

Using collection_select for simple cases such as this one is probably overkill. f.select should be sufficient.

edited May 29, 2012 at 5:48

Gerry

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answered Jan 31, 2011 at 21:31

Pan Thomakos

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10 Comments

hector Over a year ago

Changed it to that, now I'm getting: undefined method `model_name' for NilClass:Class on the first line.

Pan Thomakos Over a year ago

Is this code in your new action? If not, you might want to try replacing @foo with FooModel.new.

hector Over a year ago

Ah ha, right you are I needed to move that into the right place. Now it's telling me I have a undefined method `select_tag' for #<ActionView::Helpers::FormBuilder:0x4dce8f0> on the f.select_tag line

Pan Thomakos Over a year ago

Updated my post. I was using select_tag instead of select. My bad.

hector Over a year ago

Changed it back and updated it to look like your solution. Getting this on that line undefined method `range' for #<PlayerEventTracking:0x4bb6340>

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