Class: Paperclip::Attachment
- Inherits:
-
Object
- Object
- Paperclip::Attachment
- 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
-
#convert_options ⇒ Object
readonly
Returns the value of attribute convert_options.
-
#default_style ⇒ Object
readonly
Returns the value of attribute default_style.
-
#instance ⇒ Object
readonly
Returns the value of attribute instance.
-
#name ⇒ Object
readonly
Returns the value of attribute name.
-
#options ⇒ Object
readonly
Returns the value of attribute options.
-
#queued_for_write ⇒ Object
readonly
Returns the value of attribute queued_for_write.
-
#whiny ⇒ Object
readonly
Returns the value of attribute whiny.
Class Method Summary collapse
- .default_options ⇒ Object
-
.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.
Instance Method Summary collapse
-
#assign(uploaded_file) ⇒ Object
What gets called when you call instance.attachment = File.
-
#clear ⇒ Object
Clears out the attachment.
-
#content_type ⇒ Object
Returns the content_type of the file as originally assigned, and lives in the <attachment>_content_type attribute of the model.
-
#destroy ⇒ Object
Destroys the attachment.
-
#dirty? ⇒ Boolean
Returns true if there are changes that need to be saved.
-
#errors ⇒ Object
Returns an array containing the errors on this attachment.
-
#file? ⇒ Boolean
Returns true if a file has been assigned.
-
#fingerprint ⇒ Object
Returns the hash of the file as originally assigned, and lives in the <attachment>_fingerprint attribute of the model.
- #generate_fingerprint(source) ⇒ Object
-
#initialize(name, instance, options = {}) ⇒ Attachment
constructor
Creates an Attachment object.
-
#instance_read(attr) ⇒ Object
Reads the attachment-specific attribute on the instance.
-
#instance_write(attr, value) ⇒ Object
Writes the attachment-specific attribute on the instance.
-
#original_filename ⇒ Object
Returns the name of the file as originally assigned, and lives in the <attachment>_file_name attribute of the model.
-
#path(style_name = default_style) ⇒ Object
Returns the path of the attachment as defined by the :path option.
- #processors ⇒ Object
-
#reprocess! ⇒ Object
This method really shouldn’t be called that often.
-
#save ⇒ Object
Saves the file, if there are no errors.
-
#size ⇒ Object
Returns the size of the file as originally assigned, and lives in the <attachment>_file_size attribute of the model.
- #styles ⇒ Object
-
#to_s(style_name = nil) ⇒ Object
Alias to
url
. -
#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.
-
#url(style_name = default_style, use_timestamp = @use_timestamp) ⇒ Object
Returns the public URL of the attachment, with a given style.
-
#valid? ⇒ Boolean
Returns true if there are no errors on this attachment.
Methods included from IOStream
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 30 def initialize name, instance, = {} @name = name @instance = instance = self.class..merge() @url = [:url] @url = @url.call(self) if @url.is_a?(Proc) @path = [:path] @path = @path.call(self) if @path.is_a?(Proc) @styles = [:styles] @normalized_styles = nil @default_url = [:default_url] @validations = [:validations] @default_style = [:default_style] @storage = [:storage] @use_timestamp = [:use_timestamp] @whiny = [:whiny_thumbnails] || [:whiny] @convert_options = [:convert_options] @processors = [:processors] @options = @queued_for_delete = [] @queued_for_write = {} @errors = {} @validation_errors = nil @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 25 def @convert_options end |
#default_style ⇒ Object (readonly)
Returns the value of attribute default_style.
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# File 'lib/paperclip/attachment.rb', line 25 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 25 def instance @instance end |
#name ⇒ Object (readonly)
Returns the value of attribute name.
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# File 'lib/paperclip/attachment.rb', line 25 def name @name end |
#options ⇒ Object (readonly)
Returns the value of attribute options.
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# File 'lib/paperclip/attachment.rb', line 25 def @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 25 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 25 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 ||= { :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, :validations => [], :storage => :filesystem, :use_timestamp => true, :whiny => Paperclip.[:whiny] || Paperclip.[: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 229 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, processes the file, and runs validations. 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
If the file that is assigned is not valid, the processing (i.e. thumbnailing, etc) will NOT be run.
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# File 'lib/paperclip/attachment.rb', line 82 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 if valid? # 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 validate 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 173 def clear queue_existing_for_delete @errors = {} @validation_errors = nil 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 207 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 182 def destroy clear save end |
#dirty? ⇒ Boolean
Returns true if there are changes that need to be saved.
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# File 'lib/paperclip/attachment.rb', line 152 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 147 def errors @errors end |
#file? ⇒ Boolean
Returns true if a file has been assigned.
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# File 'lib/paperclip/attachment.rb', line 262 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 201 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 218 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 278 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 269 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 189 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 131 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 70 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 240 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 rescue Errno::EACCES => e warn "#{e} - skipping file" false 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 158 def save if valid? flush_deletes flush_writes @dirty = false true else flush_errors false end 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 195 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 60 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 136 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 213 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 122 def url(style_name = default_style, = @use_timestamp) url = original_filename.nil? ? interpolate(@default_url, style_name) : interpolate(@url, style_name) && updated_at ? [url, updated_at].compact.join(url.include?("?") ? "&" : "?") : url end |
#valid? ⇒ Boolean
Returns true if there are no errors on this attachment.
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# File 'lib/paperclip/attachment.rb', line 141 def valid? validate errors.empty? end |