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# encoding: utf-8
require 'mongoid'
require 'mongoid-grid_fs'
require 'carrierwave'
require 'carrierwave/validations/active_model'
module CarrierWave
module Mongoid
include CarrierWave::Mount
##
# See +CarrierWave::Mount#mount_uploader+ for documentation
#
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}!"
before_update :"store_previous_model_for_#{column}"
after_save :"remove_previously_stored_#{column}"
class_eval <<-RUBY, __FILE__, __LINE__+1
def #{column}=(new_file)
column = _mounter(:#{column}).serialization_column
# 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
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))
hash[column.to_s] = _mounter(column.to_sym).uploader.serializable_hash
end
end
super(options).merge(hash)
end
RUBY
end
end # Mongoid
end # CarrierWave
CarrierWave::Storage.autoload :GridFS, 'carrierwave/storage/grid_fs'
class CarrierWave::Uploader::Base
add_config :grid_fs_access_url
configure do |config|
config.storage_engines[:grid_fs] = "CarrierWave::Storage::GridFS"
end
end
Mongoid::Document::ClassMethods.send(:include, CarrierWave::Mongoid)