How to use the “number_to_currency” helper method in the model rather than view?

Question

I would like to use to_dollar method in my model like this:

module JobsHelper      
  def to_dollar(amount)
    if amount < 0
      number_to_cur         


        

Answer 1

Piggybacking off of @fguillen's response, I wanted to override the number_to_currency method in my ApplicationHelper module so that if the value was 0 or blank that it would output a dash instead.

Here's my code in case you guys would find something like this useful:

module ApplicationHelper
  def number_to_currency(value)
    if value == 0 or value.blank?
      raw "–"
    else
      ActionController::Base.helpers.number_to_currency(value)
    end
  end
end

Answer 2

You can just include ActiveSupport::NumberHelper module, if you don't need additional features defined by ActionView.

https://github.com/rails/rails/blob/44260581bec06e4ce05f3dd838c8b4736fc7eb1d/actionview/lib/action_view/helpers/number_helper.rb#L383

Answer 3

I know this thread is very old, but someone can look for solution for this problem in Rails 4+. Developers added ActiveSupport::NumberHelper, which can be used without accessing view related modules/classes using:

ActiveSupport::NumberHelper.number_to_currency(amount, precision: 0)

Answer 4

It is not a good practice but it works for me!

to import include ActionView::Helpers::NumberHelper in the controller. For example:

class ProveedorController < ApplicationController
    include ActionView::Helpers::NumberHelper
    # layout 'example'

    # GET /proveedores/filtro
    # GET /proveedores/filtro.json
    def filtro
        @proveedores = Proveedor.all

        respond_to do |format|
            format.html # filtro.html.erb
            format.json { render json: @proveedores }
        end
    end

    def valuacion_cartera
        @total_valuacion = 0
        facturas.each { |fac|
            @total_valuacion = @total_valuacion + fac.SumaDeImporte
        }

        @total = number_to_currency(@total_valuacion, :unit => "$ ")

        p '*'*80
        p @total_valuacion
    end
end

Hope it helps you!

Answer 5

You can use view_context.number_to_currency directly from you controller or model.

Answer 6

Really surprised not one person has talked about using a Decorator. Their purpose is to solve the issue you are facing, and more.

https://github.com/drapergem/draper

EDIT: Looks like the accepted answer basically did suggest doing something like this. But yeah, you want to use decorators. Here's a great tutorial series to help you understand more:

https://gorails.com/episodes/decorators-from-scratch?autoplay=1

P.S. - @excid3 I accept free membership months LOL