Module: Technoweenie::AttachmentFu::ClassMethods
- Defined in:
- lib/technoweenie/attachment_fu.rb
Class Method Summary collapse
Instance Method Summary collapse
-
#after_attachment_saved(&block) ⇒ Object
Callback after an attachment has been saved either to the file system or the DB.
-
#after_resize(&block) ⇒ Object
Callback after an image has been resized.
-
#before_thumbnail_saved(&block) ⇒ Object
Callback before a thumbnail is saved.
-
#copy_to_temp_file(file, temp_base_name) ⇒ Object
Copies the given file path to a new tempfile, returning the closed tempfile.
-
#image?(content_type) ⇒ Boolean
Returns true or false if the given content type is recognized as an image.
- #polymorphic_relation_type_column ⇒ Object
-
#thumbnail_class ⇒ Object
Get the thumbnail class, which is the current attachment class by default.
-
#validates_as_attachment ⇒ Object
Performs common validations for attachment models.
-
#write_to_temp_file(data, temp_base_name) ⇒ Object
Writes the given data to a new tempfile, returning the closed tempfile.
Class Method Details
.extended(base) ⇒ Object
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# File 'lib/technoweenie/attachment_fu.rb', line 192 def self.extended(base) base.class_inheritable_accessor :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 226 def (&block) write_inheritable_array(:after_attachment_saved, [block]) end |
#after_resize(&block) ⇒ Object
Callback after an image has been resized.
class Foo < ActiveRecord::Base
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 213 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 239 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 252 def copy_to_temp_file(file, temp_base_name) returning Tempfile.new(temp_base_name, Technoweenie::AttachmentFu.tempfile_path) 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.
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# File 'lib/technoweenie/attachment_fu.rb', line 188 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 268 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.[:polymorphic] } @@_polymorphic_relation_type_column = ref && ref.[: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 246 def thumbnail_class [:thumbnail_class] = [:thumbnail_class].constantize unless [:thumbnail_class].is_a?(Class) [:thumbnail_class] end |
#validates_as_attachment ⇒ Object
Performs common validations for attachment models.
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# File 'lib/technoweenie/attachment_fu.rb', line 182 def 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 260 def write_to_temp_file(data, temp_base_name) returning Tempfile.new(temp_base_name, Technoweenie::AttachmentFu.tempfile_path) do |tmp| tmp.binmode tmp.write data tmp.close end end |