Class: Paperclip::Attachment

Inherits:
Object
  • Object
show all
Includes:
IOStream
Defined in:
lib/paperclip/attachment.rb

Overview

The Attachment class manages the files for a given attachment. It saves when the model saves, deletes when the model is destroyed, and processes the file upon assignment.

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Methods included from IOStream

#stream_to, #to_tempfile

Constructor Details

#initialize(name, instance, options = {}) ⇒ Attachment

Creates an Attachment object. name is the name of the attachment, instance is the ActiveRecord object instance it’s attached to, and options is the same as the hash passed to has_attached_file.



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# File 'lib/paperclip/attachment.rb', line 29

def initialize name, instance, options = {}
  @name              = name
  @instance          = instance

  options = self.class.default_options.merge(options)

  @url               = options[:url]
  @url               = @url.call(self) if @url.is_a?(Proc)
  @path              = options[:path]
  @path              = @path.call(self) if @path.is_a?(Proc)
  @styles            = options[:styles]
  @normalized_styles = nil
  @default_url       = options[:default_url]
  @default_style     = options[:default_style]
  @storage           = options[:storage]
  @use_timestamp     = options[:use_timestamp]
  @whiny             = options[:whiny_thumbnails] || options[:whiny]
  @convert_options   = options[:convert_options]
  @processors        = options[:processors]
  @options           = options
  @queued_for_delete = []
  @queued_for_write  = {}
  @errors            = {}
  @dirty             = false

  initialize_storage
end

Instance Attribute Details

#convert_options ⇒ Object (readonly)

Returns the value of attribute convert_options.



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# File 'lib/paperclip/attachment.rb', line 24

def convert_options
  @convert_options
end

#default_style ⇒ Object (readonly)

Returns the value of attribute default_style.



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# File 'lib/paperclip/attachment.rb', line 24

def default_style
  @default_style
end

#instance ⇒ Object (readonly)

Returns the value of attribute instance.



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# File 'lib/paperclip/attachment.rb', line 24

def instance
  @instance
end

#name ⇒ Object (readonly)

Returns the value of attribute name.



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# File 'lib/paperclip/attachment.rb', line 24

def name
  @name
end

#options ⇒ Object (readonly)

Returns the value of attribute options.



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# File 'lib/paperclip/attachment.rb', line 24

def options
  @options
end

#queued_for_write ⇒ Object (readonly)

Returns the value of attribute queued_for_write.



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# File 'lib/paperclip/attachment.rb', line 24

def queued_for_write
  @queued_for_write
end

#whiny ⇒ Object (readonly)

Returns the value of attribute whiny.



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# File 'lib/paperclip/attachment.rb', line 24

def whiny
  @whiny
end

Class Method Details

.default_options ⇒ Object 



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# File 'lib/paperclip/attachment.rb', line 9

def self.default_options
  @default_options ||= {
    :url               => "/system/:attachment/:id/:style/:filename",
    :path              => ":rails_root/public:url",
    :styles            => {},
    :processors        => [:thumbnail],
    :convert_options   => {},
    :default_url       => "/:attachment/:style/missing.png",
    :default_style     => :original,
    :storage           => :filesystem,
    :use_timestamp     => true,
    :whiny             => Paperclip.options[:whiny] || Paperclip.options[:whiny_thumbnails]
  }
end

.interpolations ⇒ Object

Paths and URLs can have a number of variables interpolated into them to vary the storage location based on name, id, style, class, etc. This method is a deprecated access into supplying and retrieving these interpolations. Future access should use either Paperclip.interpolates or extend the Paperclip::Interpolations module directly.



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# File 'lib/paperclip/attachment.rb', line 211

def self.interpolations
  warn('[DEPRECATION] Paperclip::Attachment.interpolations is deprecated ' +
       'and will be removed from future versions. ' +
       'Use Paperclip.interpolates instead')
  Paperclip::Interpolations
end

Instance Method Details

#assign(uploaded_file) ⇒ Object

What gets called when you call instance.attachment = File. It clears errors, assigns attributes, and processes the file. It also queues up the previous file for deletion, to be flushed away on #save of its host. In addition to form uploads, you can also assign another Paperclip attachment:

new_user.avatar = old_user.avatar



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# File 'lib/paperclip/attachment.rb', line 77

def assign uploaded_file
  ensure_required_accessors!

  if uploaded_file.is_a?(Paperclip::Attachment)
    uploaded_file = uploaded_file.to_file(:original)
    close_uploaded_file = uploaded_file.respond_to?(:close)
  end

  return nil unless valid_assignment?(uploaded_file)

  uploaded_file.binmode if uploaded_file.respond_to? :binmode
  self.clear

  return nil if uploaded_file.nil?

  @queued_for_write[:original]   = to_tempfile(uploaded_file)
  instance_write(:file_name,       uploaded_file.original_filename.strip)
  instance_write(:content_type,    uploaded_file.content_type.to_s.strip)
  instance_write(:file_size,       uploaded_file.size.to_i)
  instance_write(:fingerprint,     generate_fingerprint(uploaded_file))
  instance_write(:updated_at,      Time.now)

  @dirty = true

  post_process

  # Reset the file size if the original file was reprocessed.
  instance_write(:file_size,   @queued_for_write[:original].size.to_i)
  instance_write(:fingerprint, generate_fingerprint(@queued_for_write[:original]))
ensure
  uploaded_file.close if close_uploaded_file
end

#clear ⇒ Object

Clears out the attachment. Has the same effect as previously assigning nil to the attachment. Does NOT save. If you wish to clear AND save, use #destroy.



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# File 'lib/paperclip/attachment.rb', line 156

def clear
  queue_existing_for_delete
  @errors            = {}
end

#content_type ⇒ Object

Returns the content_type of the file as originally assigned, and lives in the <attachment>_content_type attribute of the model.



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# File 'lib/paperclip/attachment.rb', line 189

def content_type
  instance_read(:content_type)
end

#destroy ⇒ Object

Destroys the attachment. Has the same effect as previously assigning nil to the attachment *and saving*. This is permanent. If you wish to wipe out the existing attachment but not save, use #clear.



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# File 'lib/paperclip/attachment.rb', line 164

def destroy
  clear
  save
end

#dirty? ⇒ Boolean

Returns true if there are changes that need to be saved.

Returns:

  • (Boolean) 


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# File 'lib/paperclip/attachment.rb', line 140

def dirty?
  @dirty
end

#errors ⇒ Object

Returns an array containing the errors on this attachment.



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# File 'lib/paperclip/attachment.rb', line 135

def errors
  @errors
end

#file? ⇒ Boolean

Returns true if a file has been assigned.

Returns:

  • (Boolean) 


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# File 'lib/paperclip/attachment.rb', line 241

def file?
  !original_filename.blank?
end

#fingerprint ⇒ Object

Returns the hash of the file as originally assigned, and lives in the <attachment>_fingerprint attribute of the model.



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# File 'lib/paperclip/attachment.rb', line 183

def fingerprint
  instance_read(:fingerprint) || (@queued_for_write[:original] && generate_fingerprint(@queued_for_write[:original]))
end

#generate_fingerprint(source) ⇒ Object 



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# File 'lib/paperclip/attachment.rb', line 200

def generate_fingerprint(source)
  data = source.read
  source.rewind if source.respond_to?(:rewind)
  Digest::MD5.hexdigest(data)
end

#instance_read(attr) ⇒ Object

Reads the attachment-specific attribute on the instance. See instance_write for more details.



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# File 'lib/paperclip/attachment.rb', line 257

def instance_read(attr)
  getter = :"#{name}_#{attr}"
  responds = instance.respond_to?(getter)
  cached = self.instance_variable_get("@_#{getter}")
  return cached if cached
  instance.send(getter) if responds || attr.to_s == "file_name"
end

#instance_write(attr, value) ⇒ Object

Writes the attachment-specific attribute on the instance. For example, instance_write(:file_name, “me.jpg”) will write “me.jpg” to the instance’s “avatar_file_name” field (assuming the attachment is called avatar).



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# File 'lib/paperclip/attachment.rb', line 248

def instance_write(attr, value)
  setter = :"#{name}_#{attr}="
  responds = instance.respond_to?(setter)
  self.instance_variable_set("@_#{setter.to_s.chop}", value)
  instance.send(setter, value) if responds || attr.to_s == "file_name"
end

#original_filename ⇒ Object

Returns the name of the file as originally assigned, and lives in the <attachment>_file_name attribute of the model.



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# File 'lib/paperclip/attachment.rb', line 171

def original_filename
  instance_read(:file_name)
end

#path(style_name = default_style) ⇒ Object

Returns the path of the attachment as defined by the :path option. If the file is stored in the filesystem the path refers to the path of the file on disk. If the file is stored in S3, the path is the “key” part of the URL, and the :bucket option refers to the S3 bucket.



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# File 'lib/paperclip/attachment.rb', line 125

def path style_name = default_style
  original_filename.nil? ? nil : interpolate(@path, style_name)
end

#processors ⇒ Object 



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# File 'lib/paperclip/attachment.rb', line 67

def processors
  @processors.respond_to?(:call) ? @processors.call(instance) : @processors
end

#reprocess! ⇒ Object

This method really shouldn’t be called that often. It’s expected use is in the paperclip:refresh rake task and that’s it. It will regenerate all thumbnails forcefully, by reobtaining the original file and going through the post-process again.



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# File 'lib/paperclip/attachment.rb', line 222

def reprocess!
  new_original = Tempfile.new("paperclip-reprocess")
  new_original.binmode
  if old_original = to_file(:original)
    new_original.write( old_original.respond_to?(:get) ? old_original.get : old_original.read )
    new_original.rewind

    @queued_for_write = { :original => new_original }
    post_process

    old_original.close if old_original.respond_to?(:close)

    save
  else
    true
  end
end

#save ⇒ Object

Saves the file, if there are no errors. If there are, it flushes them to the instance’s errors and returns false, cancelling the save.



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# File 'lib/paperclip/attachment.rb', line 146

def save
  flush_deletes
  flush_writes
  @dirty = false
  true
end

#size ⇒ Object

Returns the size of the file as originally assigned, and lives in the <attachment>_file_size attribute of the model.



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# File 'lib/paperclip/attachment.rb', line 177

def size
  instance_read(:file_size) || (@queued_for_write[:original] && @queued_for_write[:original].size)
end

#styles ⇒ Object 



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# File 'lib/paperclip/attachment.rb', line 57

def styles
  unless @normalized_styles
    @normalized_styles = {}
    (@styles.respond_to?(:call) ? @styles.call(self) : @styles).each do |name, args|
      @normalized_styles[name] = Paperclip::Style.new(name, args.dup, self)
    end
  end
  @normalized_styles
end

#to_s(style_name = nil) ⇒ Object

Alias to url



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# File 'lib/paperclip/attachment.rb', line 130

def to_s style_name = nil
  url(style_name)
end

#updated_at ⇒ Object

Returns the last modified time of the file as originally assigned, and lives in the <attachment>_updated_at attribute of the model.



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# File 'lib/paperclip/attachment.rb', line 195

def updated_at
  time = instance_read(:updated_at)
  time && time.to_f.to_i
end

#url(style_name = default_style, use_timestamp = @use_timestamp) ⇒ Object

Returns the public URL of the attachment, with a given style. Note that this does not necessarily need to point to a file that your web server can access and can point to an action in your app, if you need fine grained security. This is not recommended if you don’t need the security, however, for performance reasons. Set use_timestamp to false if you want to stop the attachment update time appended to the url



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# File 'lib/paperclip/attachment.rb', line 116

def url(style_name = default_style, use_timestamp = @use_timestamp)
  url = original_filename.nil? ? interpolate(@default_url, style_name) : interpolate(@url, style_name)
  use_timestamp && updated_at ? [url, updated_at].compact.join(url.include?("?") ? "&" : "?") : url
end