ruby-on-rails - rails/Prawn : how do I use rails helpers inside a Prawn class?

Question

我正在尝试在 prawn 类中使用 rails 3.2 助手，但 rails 抛出:

undefined method `number_with_precision' for #<QuotePdf:0x83d4188>

Prawn 类

class QuotePdf < Prawn::Document
  def initialize(quote)
    super()

    text "sum: #{number_with_precision(quote.sum)}"
  end
end

Controller

def show
  @quote = current_user.company.quotes.where(:id => params[:id]).first
  head :unauthorized and return unless @quote

  respond_with @quote, :layout => !params[:_pjax] do |format|
    format.pdf do
      send_data QuotePdf.new(@quote).render, filename: "Devis-#{@quote.date_emission.strftime("%d/%m/%Y")}.pdf",
      type: "application/pdf"
    end
  end
end

感谢您的帮助。

Answer 1

您必须在您的 prawn 文档类中明确包含 ActionView::Helpers::NumberHelper(或任何其他辅助类/模块)。

class QuotePdf < Prawn::Document
  include ActionView::Helpers::NumberHelper # <-

  def initialize(quote)
    super()

    text "sum: #{number_with_precision(quote.sum)}"
  end
end