Question

I have a database table with vehicles in it and they’re separated into columns by year, make, model, and trim.

I’d like to create a form where a user can select the year, then the make, then the model, then the trim with each selection (except for year) taking into consideration the selection before it.

Is there a way to do this? What would it look like?

Answer 1

Well, you have lots of different ways to do it.

I would do the following way:

$("#year']").click(function(){
  var url = '/get_make_values?year=' + $(this).val()
  $("#group").removeOption(/./)
  $.get(url, function(data) {
    $('#group').addOption(data, false);
  });
});

In your controller,

def get_make_values
  val = params[:year]
  #Use val to find records
  options = Vehicles.collect{|x| "'#{x.id}' : '#{x.label}'"}    
  render :text => "{#{options.join(",")}}" 
end

In your models you can define some scopes:

class Vehicle < ActiveRecord::Base
  scope :by_year, lambda {|v| where(:year => year)}
  ...
end

Hope this helps!

Regards

Edit:

I’ll explain in parts

In the javascript I’m associating an event to the list of year, then I make a GET request to a controller action that get all make values. Then I fill the MAKE list with it
You should do it to make, model and trim also

In the controller I’m creating a method to retrieve the make values (that is called by the get method). You’ll have to do it for the other retrieved values also. Model and trim.

In the model I just suggested a resource that you may use to facilitate the queries that is the scope feature.

Please accept my reply!