Contents

require 'dynamic_image'

module DynamicImage
  module ActiveRecordExtensions

    def self.included(base)
      base.send :extend, ClassMethods
    end

    module ClassMethods
      # By using <tt>belongs_to_image</tt> over <tt>belongs_to</tt>, you gain the ability to
      # set the image directly from an uploaded file. This works exactly like <tt>belongs_to</tt>,
      # except the class name will default to 'Image' - not the name of the association.
      # 
      # Example:
      #
      #   # Model code
      #   class Person < ActiveRecord::Base
      #     belongs_to_image :mugshot
      #   end
      #
      #   # View code
      #   <% form_for 'person', @person, :html => {:multipart => true} do |f| %>
      #     <%= f.file_field :mugshot %>
      #   <% end %>
      #
      def belongs_to_image(association_id, options={})
        options[:class_name] ||= 'Image'
        options[:foreign_key] ||= options[:class_name].downcase+'_id'
        belongs_to association_id, options

        # Overwrite the setter method
        class_eval <<-end_eval
          alias_method :associated_#{association_id}=, :#{association_id}=
          def #{association_id}=(img_obj)
            # Convert a Tempfile to a proper Image
            unless img_obj.kind_of?(ActiveRecord::Base)
              DynamicImage.dirty_memory = true # Flag for GC
              img_obj = Image.create(:imagefile => img_obj)
            end
            # Quietly skip blank strings
            unless img_obj.kind_of?(String) && img_obj.blank?
              self.associated_#{association_id} = img_obj
            end
          end
          def #{association_id}?
            (self.#{association_id} && self.#{association_id}.data?) ? true : false
          end
        end_eval

        send :include, DynamicImage::ActiveRecordExtensions::InstanceMethods
      end 
    end

    module InstanceMethods
    end
  end
end

ActiveRecord::Base.send(:include, DynamicImage::ActiveRecordExtensions)

Version data entries

8 entries across 8 versions & 1 rubygems

Version	Path
dynamic_image-1.0.4	lib/dynamic_image/active_record_extensions.rb
dynamic_image-1.0.3	lib/dynamic_image/active_record_extensions.rb
dynamic_image-1.0.2	lib/dynamic_image/active_record_extensions.rb
dynamic_image-1.0.1	lib/dynamic_image/active_record_extensions.rb
dynamic_image-0.9.9	lib/dynamic_image/active_record_extensions.rb
dynamic_image-0.9.8	lib/dynamic_image/active_record_extensions.rb
dynamic_image-0.9.7	lib/dynamic_image/active_record_extensions.rb
dynamic_image-0.9.6	lib/dynamic_image/active_record_extensions.rb