Module: Technoweenie::AttachmentFu::ClassMethods

Defined in:
lib/technoweenie/attachment_fu.rb

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.extended(base) ⇒ Object 



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# File 'lib/technoweenie/attachment_fu.rb', line 193

def self.extended(base)
  base.class_attribute :attachment_options
  base.before_destroy :destroy_thumbnails
  base.before_validation :set_size_from_temp_path
  base.after_save :after_process_attachment
  base.after_destroy :destroy_file
  base.after_validation :process_attachment
  #if defined?(::ActiveSupport::Callbacks)
  #  base.define_callbacks :after_resize, :after_attachment_saved, :before_thumbnail_saved
  #end
end

Instance Method Details

#after_attachment_saved(&block) ⇒ Object

Callback after an attachment has been saved either to the file system or the DB. Only called if the file has been changed, not necessarily if the record is updated.

class Foo < ActiveRecord::Base
  acts_as_attachment
  after_attachment_saved do |record|
    ...
  end
end



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# File 'lib/technoweenie/attachment_fu.rb', line 227

def after_attachment_saved(&block)
  write_inheritable_array(:after_attachment_saved, [block])
end

#after_resize(&block) ⇒ Object

Callback after an image has been resized.

class Foo < ActiveRecord::Base
  acts_as_attachment
  after_resize do |record, img|
    record.aspect_ratio = img.columns.to_f / img.rows.to_f
  end
end



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# File 'lib/technoweenie/attachment_fu.rb', line 214

def after_resize(&block)
  write_inheritable_array(:after_resize, [block])
end

#before_thumbnail_saved(&block) ⇒ Object

Callback before a thumbnail is saved. Use this to pass any necessary extra attributes that may be required.

class Foo < ActiveRecord::Base
  acts_as_attachment
  before_thumbnail_saved do |thumbnail|
    record = thumbnail.parent
    ...
  end
end



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# File 'lib/technoweenie/attachment_fu.rb', line 240

def before_thumbnail_saved(&block)
  write_inheritable_array(:before_thumbnail_saved, [block])
end

#copy_to_temp_file(file, temp_base_name) ⇒ Object

Copies the given file path to a new tempfile, returning the closed tempfile.



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# File 'lib/technoweenie/attachment_fu.rb', line 253

def copy_to_temp_file(file, temp_base_name)
  Tempfile.new(temp_base_name, ::Technoweenie::AttachmentFu.tempfile_path).tap do |tmp|
    tmp.close
    FileUtils.cp file, tmp.path
  end
end

#image?(content_type) ⇒ Boolean

Returns true or false if the given content type is recognized as an image.

Returns:

  • (Boolean) 


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# File 'lib/technoweenie/attachment_fu.rb', line 189

def image?(content_type)
  content_types.include?(content_type)
end

#polymorphic_relation_type_column ⇒ Object 



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# File 'lib/technoweenie/attachment_fu.rb', line 269

def polymorphic_relation_type_column
  return @@_polymorphic_relation_type_column if defined?(@@_polymorphic_relation_type_column)
  # Checked against ActiveRecord 1.15.6 through Edge @ 2009-08-05.
  ref = reflections.values.detect { |r| r.macro == :belongs_to && r.options[:polymorphic] }
  @@_polymorphic_relation_type_column = ref && ref.options[:foreign_type]
end

#thumbnail_class ⇒ Object

Get the thumbnail class, which is the current attachment class by default. Configure this with the :thumbnail_class option.



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# File 'lib/technoweenie/attachment_fu.rb', line 247

def thumbnail_class
  attachment_options[:thumbnail_class] = attachment_options[:thumbnail_class].constantize unless attachment_options[:thumbnail_class].is_a?(Class)
  attachment_options[:thumbnail_class]
end

#validates_as_attachment ⇒ Object

Performs common validations for attachment models.



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# File 'lib/technoweenie/attachment_fu.rb', line 183

def validates_as_attachment
  validates_presence_of :size, :content_type, :filename
  validate              :attachment_attributes_valid?
end

#write_to_temp_file(data, temp_base_name) ⇒ Object

Writes the given data to a new tempfile, returning the closed tempfile.



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# File 'lib/technoweenie/attachment_fu.rb', line 261

def write_to_temp_file(data, temp_base_name)
  Tempfile.new(temp_base_name, ::Technoweenie::AttachmentFu.tempfile_path).tap do |tmp|
    tmp.binmode
    tmp.write data
    tmp.close
  end
end