episode-178/todo/vendor/plugins/paperclip/lib/paperclip.rb
# +has_attached_file+ gives the class it is called on an attribute that maps to a file. This
# is typically a file stored somewhere on the filesystem and has been uploaded by a user. 
# The attribute returns a Paperclip::Attachment object which handles the management of
# that file. The intent is to make the attachment as much like a normal attribute. The 
# thumbnails will be created when the new file is assigned, but they will *not* be saved 
# until +save+ is called on the record. Likewise, if the attribute is set to +nil+ is 
# called on it, the attachment will *not* be deleted until +save+ is called. See the 
# Paperclip::Attachment documentation for more specifics. There are a number of options 
# you can set to change the behavior of a Paperclip attachment:
# * +url+: The full URL of where the attachment is publically accessible. This can just
#   as easily point to a directory served directly through Apache as it can to an action
#   that can control permissions. You can specify the full domain and path, but usually
#   just an absolute path is sufficient. The leading slash *must* be included manually for 
#   absolute paths. The default value is 
#   "/system/:attachment/:id/:style/:filename". See
#   Paperclip::Attachment#interpolate for more information on variable interpolaton.
#     :url => "/:class/:attachment/:id/:style_:filename"
#     :url => "http://some.other.host/stuff/:class/:id_:extension"
# * +default_url+: The URL that will be returned if there is no attachment assigned. 
#   This field is interpolated just as the url is. The default value is 
#   "/:attachment/:style/missing.png"
#     has_attached_file :avatar, :default_url => "/images/default_:style_avatar.png"
#     User.new.avatar_url(:small) # => "/images/default_small_avatar.png"
# * +styles+: A hash of thumbnail styles and their geometries. You can find more about 
#   geometry strings at the ImageMagick website 
#   (http://www.imagemagick.org/script/command-line-options.php#resize). Paperclip
#   also adds the "#" option (e.g. "50x50#"), which will resize the image to fit maximally 
#   inside the dimensions and then crop the rest off (weighted at the center). The 
#   default value is to generate no thumbnails.
# * +default_style+: The thumbnail style that will be used by default URLs. 
#   Defaults to +original+.
#     has_attached_file :avatar, :styles => { :normal => "100x100#" },
#                       :default_style => :normal
#     user.avatar.url # => "/avatars/23/normal_me.png"
# * +whiny+: Will raise an error if Paperclip cannot post_process an uploaded file due
#   to a command line error. This will override the global setting for this attachment. 
#   Defaults to true. This option used to be called :whiny_thumbanils, but this is
#   deprecated.
# * +convert_options+: When creating thumbnails, use this free-form options
#   field to pass in various convert command options.  Typical options are "-strip" to
#   remove all Exif data from the image (save space for thumbnails and avatars) or
#   "-depth 8" to specify the bit depth of the resulting conversion.  See ImageMagick
#   convert documentation for more options: (http://www.imagemagick.org/script/convert.php)
#   Note that this option takes a hash of options, each of which correspond to the style
#   of thumbnail being generated. You can also specify :all as a key, which will apply
#   to all of the thumbnails being generated. If you specify options for the :original,
#   it would be best if you did not specify destructive options, as the intent of keeping
#   the original around is to regenerate all the thumbnails when requirements change.
#     has_attached_file :avatar, :styles => { :large => "300x300", :negative => "100x100" }
#                                :convert_options => {
#                                  :all => "-strip",
#                                  :negative => "-negate"
#                                }
#   NOTE: While not deprecated yet, it is not recommended to specify options this way.
#   It is recommended that :convert_options option be included in the hash passed to each
#   :styles for compatability with future versions.
# * +storage+: Chooses the storage backend where the files will be stored. The current
#   choices are :filesystem and :s3. The default is :filesystem. Make sure you read the
#   documentation for Paperclip::Storage::Filesystem and Paperclip::Storage::S3
#   for backend-specific options.
+has_attached_file+ gives the class it is called on an attribute that maps to a file. This
is typically a file stored somewhere on the filesystem and has been uploaded by a user.
The attribute returns a Paperclip::Attachment object which handles the management of
that file. The intent is to make the attachment as much like a normal attribute. The
thumbnails will be created when the new file is assigned, but they will *not* be saved
until +save+ is called on the record. Likewise, if the attribute is set to +nil+ is
called on it, the attachment will *not* be deleted until +save+ is called. See the
Paperclip::Attachment documentation for more specifics. There are a number of options
you can set to change the behavior of a Paperclip attachment:
+url+: The full URL of where the attachment is publically accessible. This can just
as easily point to a directory served directly through Apache as it can to an action
that can control permissions. You can specify the full domain and path, but usually
just an absolute path is sufficient. The leading slash *must* be included manually for
absolute paths.
+ has_attached_file + gives the class it is called on an attribute that maps to a file . This is typically a file stored somewhere on the filesystem and has been uploaded by a user . The attribute returns a Paperclip :: Attachment object which handles the management of that file . The intent is to make the attachment as much like a normal attribute . The thumbnails will be created when the new file is assigned but they will * not * be saved until + save + is called on the record . Likewise if the attribute is set to + nil + is called on it the attachment will * not * be deleted until + save + is called . See the Paperclip :: Attachment documentation for more specifics . There are a number of options you can set to change the behavior of a Paperclip attachment : + url + : The full URL of where the attachment is publically accessible . This can just as easily point to a directory served directly through Apache as it can to an action that can control permissions . You can specify the full domain and path but usually just an absolute path is sufficient . The leading slash * must * be included manually for absolute paths .
def has_attached_file name, options = {}
      include InstanceMethods
      write_inheritable_attribute(:attachment_definitions, {}) if attachment_definitions.nil?
      attachment_definitions[name] = {:validations => []}.merge(options)
      after_save :save_attached_files
      before_destroy :destroy_attached_files
      define_callbacks :before_post_process, :after_post_process
      define_callbacks :"before_#{name}_post_process", :"after_#{name}_post_process"
      define_method name do |*args|
        a = attachment_for(name)
        (args.length > 0) ? a.to_s(args.first) : a
      end
      define_method "#{name}=" do |file|
        attachment_for(name).assign(file)
      end
      define_method "#{name}?" do
        attachment_for(name).file?
      end
      validates_each(name) do |record, attr, value|
        attachment = record.attachment_for(name)
        attachment.send(:flush_errors) unless attachment.valid?
      end
    end
def has_attached_file name , options = { } include InstanceMethods write_inheritable_attribute ( :attachment_definitions , { } ) if attachment_definitions . nil? attachment_definitions [ name ] = { :validations => [ ] } . merge ( options ) after_save :save_attached_files before_destroy :destroy_attached_files define_callbacks :before_post_process , :after_post_process define_callbacks :" before_ #{ name } _post_process " , :" after_ #{ name } _post_process " define_method name do | * args | a = attachment_for ( name ) ( args . length > 0 ) ? a . to_s ( args . first ) : a end define_method "#{name}=" do | file | attachment_for ( name ) . assign ( file ) end define_method "#{name}?" do attachment_for ( name ) . file? end validates_each ( name ) do | record , attr , value | attachment = record . attachment_for ( name ) attachment . send ( :flush_errors ) unless attachment . valid? end end
+has_attached_file+ gives the class it is called on an attribute that maps to a file.
+ has_attached_file + gives the class it is called on an attribute that maps to a file .
name
options