Module: Paperclip::Interpolations

Extended by:
Interpolations
Included in:
Interpolations
Defined in:
lib/paperclip/interpolations.rb

Overview

This module contains all the methods that are available for interpolation in paths and urls. To add your own (or override an existing one), you can either open this module and define it, or call the Paperclip.interpolates method.

Constant Summary collapse

RIGHT_HERE =

Returns the interpolated URL. Will raise an error if the url itself contains “:url” to prevent infinite recursion. This interpolation is used in the default :path to ease default specifications.

"#{__FILE__.gsub(%r{^\./}, "")}:#{__LINE__ + 3}"

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.[](name) ⇒ Object

Hash access of interpolations. Included only for compatibility, and is not intended for normal use.



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# File 'lib/paperclip/interpolations.rb', line 17

def self.[] name
  method(name)
end

.[]=(name, block) ⇒ Object

Hash assignment of interpolations. Included only for compatibility, and is not intended for normal use.



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# File 'lib/paperclip/interpolations.rb', line 11

def self.[]= name, block
  define_method(name, &block)
end

.all ⇒ Object

Returns a sorted list of all interpolations.



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# File 'lib/paperclip/interpolations.rb', line 22

def self.all
  self.instance_methods(false).sort
end

.interpolate(pattern, *args) ⇒ Object

Perform the actual interpolation. Takes the pattern to interpolate and the arguments to pass, which are the attachment and style name. You can pass a method name on your record as a symbol, which should turn an interpolation pattern for Paperclip to use.



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# File 'lib/paperclip/interpolations.rb', line 30

def self.interpolate pattern, *args
  pattern = args.first.instance.send(pattern) if pattern.kind_of? Symbol
  all.reverse.inject(pattern) do |result, tag|
    result.gsub(/:#{tag}/) do |match|
      send( tag, *args )
    end
  end
end

Instance Method Details

#attachment(attachment, style_name) ⇒ Object

Returns the pluralized form of the attachment name. e.g. “avatars” for an attachment of :avatar



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

def attachment attachment, style_name
  attachment.name.to_s.downcase.pluralize
end

#basename(attachment, style_name) ⇒ Object

Returns the basename of the file. e.g. “file” for “file.jpg”



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# File 'lib/paperclip/interpolations.rb', line 88

def basename attachment, style_name
  attachment.original_filename.gsub(/#{Regexp.escape(File.extname(attachment.original_filename))}$/, "")
end

#class(attachment = nil, style_name = nil) ⇒ Object

Returns the underscored, pluralized version of the class name. e.g. “users” for the User class. NOTE: The arguments need to be optional, because some tools fetch all class names. Calling #class will return the expected class.



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# File 'lib/paperclip/interpolations.rb', line 82

def class attachment = nil, style_name = nil
  return super() if attachment.nil? && style_name.nil?
  attachment.instance.class.to_s.underscore.pluralize
end

#content_type_extension(attachment, style_name) ⇒ Object

Returns an extension based on the content type. e.g. “jpeg” for “image/jpeg”. If the style has a specified format, it will override the content-type detection.

Each mime type generally has multiple extensions associated with it, so if the extension from the original filename is one of these extensions, that extension is used, otherwise, the first in the list is used.



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# File 'lib/paperclip/interpolations.rb', line 107

def content_type_extension attachment, style_name
  mime_type = MIME::Types[attachment.content_type]
  extensions_for_mime_type = unless mime_type.empty?
    mime_type.first.extensions
  else
    []
  end

  original_extension = extension(attachment, style_name)
  style = attachment.styles[style_name.to_s.to_sym]
  if style && style[:format]
    style[:format].to_s
  elsif extensions_for_mime_type.include? original_extension
    original_extension
  elsif !extensions_for_mime_type.empty?
    extensions_for_mime_type.first
  else
    # It's possible, though unlikely, that the mime type is not in the
    # database, so just use the part after the '/' in the mime type as the
    # extension.
    %r{/([^/]*)$}.match(attachment.content_type)[1]
  end
end

#extension(attachment, style_name) ⇒ Object

Returns the extension of the file. e.g. “jpg” for “file.jpg” If the style has a format defined, it will return the format instead of the actual extension.



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# File 'lib/paperclip/interpolations.rb', line 95

def extension attachment, style_name
  ((style = attachment.styles[style_name.to_s.to_sym]) && style[:format]) ||
    File.extname(attachment.original_filename).gsub(/^\.+/, "")
end

#filename(attachment, style_name) ⇒ Object

Returns the filename, the same way as “:basename.:extension” would.



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# File 'lib/paperclip/interpolations.rb', line 40

def filename attachment, style_name
  [ basename(attachment, style_name), extension(attachment, style_name) ].reject(&:blank?).join(".")
end

#fingerprint(attachment, style_name) ⇒ Object

Returns the fingerprint of the instance.



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# File 'lib/paperclip/interpolations.rb', line 142

def fingerprint attachment, style_name
  attachment.fingerprint
end

#hash(attachment = nil, style_name = nil) ⇒ Object

Returns a the attachment hash. See Paperclip::Attachment#hash_key for more details.



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# File 'lib/paperclip/interpolations.rb', line 148

def hash attachment=nil, style_name=nil
  if attachment && style_name
    attachment.hash_key(style_name)
  else
    super()
  end
end

#id(attachment, style_name) ⇒ Object

Returns the id of the instance.



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# File 'lib/paperclip/interpolations.rb', line 132

def id attachment, style_name
  attachment.instance.id
end

#id_partition(attachment, style_name) ⇒ Object

Returns the id of the instance in a split path form. e.g. returns 000/001/234 for an id of 1234.



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# File 'lib/paperclip/interpolations.rb', line 158

def id_partition attachment, style_name
  case id = attachment.instance.id
  when Integer
    ("%09d" % id).scan(/\d{3}/).join("/")
  when String
    id.scan(/.{3}/).first(3).join("/")
  else
    nil
  end
end

#param(attachment, style_name) ⇒ Object

Returns the #to_param of the instance.



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# File 'lib/paperclip/interpolations.rb', line 137

def param attachment, style_name
  attachment.instance.to_param
end

#rails_env(attachment, style_name) ⇒ Object

Returns the Rails.env constant.



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# File 'lib/paperclip/interpolations.rb', line 74

def rails_env attachment, style_name
  Rails.env
end

#rails_root(attachment, style_name) ⇒ Object

Returns the Rails.root constant.



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# File 'lib/paperclip/interpolations.rb', line 69

def rails_root attachment, style_name
  Rails.root
end

#style(attachment, style_name) ⇒ Object

Returns the style, or the default style if nil is supplied.



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# File 'lib/paperclip/interpolations.rb', line 176

def style attachment, style_name
  style_name || attachment.default_style
end

#timestamp(attachment, style_name) ⇒ Object

Returns the timestamp as defined by the <attachment>_updated_at field in the server default time zone unless :use_global_time_zone is set to false. Note that a Rails.config.time_zone change will still invalidate any path or URL that uses :timestamp. For a time_zone-agnostic timestamp, use #updated_at.



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# File 'lib/paperclip/interpolations.rb', line 58

def timestamp attachment, style_name
  attachment.instance_read(:updated_at).in_time_zone(attachment.time_zone).to_s
end

#updated_at(attachment, style_name) ⇒ Object

Returns an integer timestamp that is time zone-neutral, so that paths remain valid even if a server’s time zone changes.



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# File 'lib/paperclip/interpolations.rb', line 64

def updated_at attachment, style_name
  attachment.updated_at
end

#url(attachment, style_name) ⇒ Object

Raises:



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# File 'lib/paperclip/interpolations.rb', line 48

def url attachment, style_name
  raise Errors::InfiniteInterpolationError if caller.any?{|b| b.index(RIGHT_HERE) }
  attachment.url(style_name, :timestamp => false, :escape => false)
end