Wice_Grid CSV export not working - Uninitialized constant CSV::Writer - ruby-on-rails

Question

I "inherited" a rails aplication running with ruby 1.8.7 in development.
I have a wice_grid table which I'm trying to export in CSV and in development all goes perfect.
When I push it to production, i get the following error:
uninitialized constant CSV::Writer
The production machine is running Ruby 1.9.1 and from what I read, I suppose the problem comes from there.
I've tried to put:
required 'csv'
In the controller or the model, but nothing happens, development works, production does not.
Here is the controller code:
def index
require 'csv'
#service_requests = initialize_grid(ServiceRequest,
:name => "solicitudes",
:order => "created_at" ,
:order_direction => 'desc',
:include => [:user, :service],
:enable_export_to_csv => true,
:csv_file_name => 'Listado de Solicitudes'
)
export_grid_if_requested('solicitudes' => 'service_requests') do
#Si se pulsa en exportar se exportan todos las celdas de la tabla seleccionada (con filtros aplicados)
end
end
Here is the part of the view, which calls a partial:
<%= render :partial => 'service_requests' %>
Here is the partial, cropped for making the question not too long:
<%= grid(#service_requests, :show_filters => :always) do |service_request|
[...]
service_request.column :column_name => 'Nombre' , :attribute_name => 'name', :model_class => User do |sr|
sr.user.name
end
service_request.column :column_name => 'Apellidos' , :attribute_name => 'lastName' , :model_class => User do |sr|
sr.user.lastName
end
[...]
end %>
I read this thread but didnt help me much: write csv in ruby 1.9 and CSV::Writer
Thank you all in advance!

Answer 1

Somewhere, that you haven't posted, you are referencing CSV::Writer. This works locally because you're using Ruby 1.8.7, but your production server is using Ruby 1.9.1. CSV::Writer was deprecated with Ruby 1.9.
From the the docs:
# * The old CSV's Reader and Writer classes have been dropped.
Step one is to upgrade your local Ruby to the same version as the server. This will give you the same error locally, which should go away once you find and remove that CSV::Writer.
The CSV docs give examples of how to use the current CSV class to accomplish what CSV::Writer used to do. Here's an example:
# == Writing
#
# === To a File
#
# CSV.open("path/to/file.csv", "wb") do |csv|
# csv << ["row", "of", "CSV", "data"]
# csv << ["another", "row"]
# # ...
# end
Upgrading Ruby will probably raise other errors. But Ruby 1.8.7 was retired in 2013 so these are problems you're going to want to fix now rather than later.
Good luck!