Multiple Select Tag in Rails - ruby-on-rails

Question

Im trying to implement a multiple level drop down list in Rails
I have three Tables in my DB.
vehicle_make.rb
class VehicleMake < ActiveRecord::Base
validates_uniqueness_of :make
has_many :appointments
end
vehicle_model.rb
class VehicleModel < ActiveRecord::Base
validates_uniqueness_of :model
has_many :appointments
end
vehicle_make_model.rb
class VehicleMakeModel < ActiveRecord::Base
validates_uniqueness_of :vehicle_make_id, :scope => :vehicle_model_id
end
and im trying to implement a multiple dropdown list in appointments.html.rb
on selecting the vehicle model only corresponding make should load..
<%= f.select :vehicle_make_id, options_for_select(vehicle_make.map {|s| [s.make, s.id]}, appointment.vehicle_make_id), {}, {class: "form-control"} %>
and in my js i have..
$('#appointment_vehicle_make_id').on('change', function() {
var vehicle_make_id = this.value;
$.ajax({
url : '/appointments/update_models',
type : 'GET',
data : {
make_id : vehicle_make_id
},
success : function(response) {
console.log(response);
}
});
});
and this is my controller method.
def update_models
#vehicle_models = VehicleModel.all
#model_ids = []
#selected_vehicle_models = VehicleMakeModel.where(vehicle_make_id: params[:make_id]).order(:vehicle_model_id) unless params[:make_id].blank?
#selected_vehicle_models.each do |t|
#model_ids << t.vehicle_model_id
end
respond_to do |format|
format.html { render layout: false }
format.js
end
end
I have html page named update_models.html.erb associated to the above action.
<%= select_tag :vehicle_model_id, options_for_select(#model_ids.map {|s| [s.model, s.first.id]}, nil), {}, {class: "form-control"} %>
I get an error in terminal saying
ActionView::Template::Error (wrong number of arguments (4 for 1..3)):
1: <%= select_tag :vehicle_model_id, options_for_select(#model_ids.map {|s| [s.model, s.first.id]}, nil), {}, {class: "form-control"} %>
Im stuck here. I dont know how to proceed from here.. please help

Answer 1

In your controller action update_models, you are trying to render js, so it's trying to find template named as update_models.js.erb.
You can try replacing your respond_to block with:
respond_to do |format|
format.json { render :json => #model_ids }
end
Afterwards, you will need to parse this data in your ajax success callback