Untitled

can't access ActiveRecord mutators in a block
Prawn::Document.generate("hello.pdf") do
  @model.field1
end

my_model = @model
Prawn::Document.generate("hello.pdf") do
  my_model.field1
end

module Prawn
  class Document
    def self.generate(filename,options={},&block)
      pdf = new(options,&block)
      pdf.render_file(filename)
    end

    def initialize(options={},&block)
      if block
        block.arity < 1 ? instance_eval(&block) : block[self]
      end
    end
  end
end

#lib/prawn/document.rb: Document#initialize
if block
  block.arity < 1 ? instance_eval(&block) : block[self]
end

Prawn::Document.generate("hello.pdf") do |doc|
  @my_model.field1
end