module CarrierWave::Mongoid
Public Instance Methods
mount_uploader(column, uploader=nil, options={}, &block)
click to toggle source
See +CarrierWave::Mount#mount_uploader+ for documentation
Calls superclass method
# File lib/carrierwave/mongoid.rb, line 14 def mount_uploader(column, uploader=nil, options={}, &block) field options[:mount_on] || column super alias_method :read_uploader, :read_attribute alias_method :write_uploader, :write_attribute public :read_uploader public :write_uploader include CarrierWave::Validations::ActiveModel validates_integrity_of column if uploader_option(column.to_sym, :validate_integrity) validates_processing_of column if uploader_option(column.to_sym, :validate_processing) after_save :"store_#{column}!" before_save :"write_#{column}_identifier" after_destroy :"remove_#{column}!" if Gem::Version.new(CarrierWave::VERSION) >= Gem::Version.new("1.0.beta") before_update :"store_previous_changes_for_#{column}" else before_update :"store_previous_model_for_#{column}" end after_save :"remove_previously_stored_#{column}" class_eval <<-RUBY, __FILE__, __LINE__+1 def #{column}=(new_file) column = _mounter(:#{column}).serialization_column # We're using _new_ and _old_ placeholder values to force Mongoid to # recognize changes in embedded documents. Before we assign these # values, we need to store the original file name in case we need to # delete it when document is saved. previous_uploader_value = read_uploader(column) @_previous_uploader_value_for_#{column} = previous_uploader_value # mongoid won't upload a new file if there was no file previously. write_uploader(column, '_old_') if self.persisted? && read_uploader(column).nil? send(:"\#{column}_will_change!") super end def remove_#{column}=(arg) if ['1', true].include?(arg) column = _mounter(:#{column}).serialization_column send(:"\#{column}_will_change!") end super end def remove_#{column}! super unless respond_to?(:paranoid?) && paranoid? && flagged_for_destroy? end # Overrides Mongoid's default dirty behavior to instead work more like # ActiveRecord's. Mongoid doesn't deem an attribute as changed unless # the new value is different than the original. Given that CarrierWave # caches files before save, it's necessary to know that there's a # pending change even though the attribute value itself might not # reflect that yet. def #{column}_changed? changed_attributes.has_key?("#{column}") end # The default Mongoid attribute_will_change! method is not enough # when we want to upload a new file in an existing embedded document. # The custom version of that method forces the callbacks to be # ran and so does the upload. def #{column}_will_change! changed_attributes["#{column}"] = '_new_' end # Since we had to use tricks with _old_ and _new_ values to properly # track changes in embedded documents, we need to overwrite this method # to remove the original file if it was replaced with a new one that # had a different name. if Gem::Version.new(CarrierWave::VERSION) >= Gem::Version.new("1.0.beta") def remove_previously_stored_#{column} before, after = @_previous_changes_for_#{column} # Don't delete if the files had the same name return if before.nil? && after.nil? # Proceed to remove the file, use the original name instead of '_new_' before = @_previous_uploader_value_for_#{column} || before _mounter(:#{column}).remove_previous([before], [after]) end end # CarrierWave 1.1 references ::ActiveRecord constant directly which # will fail in projects without ActiveRecord. We need to overwrite this # method to avoid it. # See https://github.com/carrierwaveuploader/carrierwave/blob/07dc4d7bd7806ab4b963cf8acbad73d97cdfe74e/lib/carrierwave/mount.rb#L189 def store_previous_changes_for_#{column} @_previous_changes_for_#{column} = changes[_mounter(:#{column}).serialization_column] end def find_previous_model_for_#{column} if self.embedded? if self.respond_to?(:__metadata) # Mongoid >= 4.0.0.beta1 ancestors = [[ self.__metadata.key, self._parent ]].tap { |x| x.unshift([ x.first.last.__metadata.key, x.first.last._parent ]) while x.first.last.embedded? } else # Mongoid < 4.0.0.beta1 ancestors = [[ self.metadata.key, self._parent ]].tap { |x| x.unshift([ x.first.last.metadata.key, x.first.last._parent ]) while x.first.last.embedded? } end first_parent = ancestors.first.last reloaded_parent = first_parent.class.unscoped.find(first_parent.to_key.first) association = ancestors.inject(reloaded_parent) { |parent,(key,ancestor)| (parent.is_a?(Array) ? parent.find(ancestor.to_key.first) : parent).send(key) } association.is_a?(Array) ? association.find(to_key.first) : association else self.class.unscoped.for_ids(to_key).first end end def serializable_hash(options=nil) hash = {} except = options && options[:except] && Array.wrap(options[:except]).map(&:to_s) only = options && options[:only] && Array.wrap(options[:only]).map(&:to_s) self.class.uploaders.each do |column, uploader| if (!only && !except) || (only && only.include?(column.to_s)) || (except && !except.include?(column.to_s)) if Gem::Version.new(CarrierWave::VERSION) >= Gem::Version.new("1.0.beta") next if _mounter(column.to_sym).uploaders.blank? hash[column.to_s] = _mounter(column.to_sym).uploaders[0].serializable_hash else hash[column.to_s] = _mounter(column.to_sym).uploader.serializable_hash end end end super(options).merge(hash) end RUBY end