Class: Saviour::Integrator

Inherits:
Object
  • Object
show all
Defined in:
lib/saviour/integrator.rb

Instance Method Summary collapse

Constructor Details

#initialize(klass, persistence_klass) ⇒ Integrator

Returns a new instance of Integrator.



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# File 'lib/saviour/integrator.rb', line 3

def initialize(klass, persistence_klass)
  @klass = klass
  @persistence_klass = persistence_klass
end

Instance Method Details

#setup! ⇒ Object

Raises:



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# File 'lib/saviour/integrator.rb', line 8

def setup!
  raise(ConfigurationError, "You cannot include Saviour::Model twice in the same class") if @klass.respond_to?(:attached_files)

  @klass.class_attribute :attached_files
  @klass.attached_files = []
  @klass.class_attribute :followers_per_leader_config
  @klass.followers_per_leader_config = {}
  @klass.class_attribute :uploader_classes
  @klass.uploader_classes = {}

  persistence_klass = @persistence_klass

  @klass.define_singleton_method "attach_file" do |attach_as, *maybe_uploader_klass, **opts, &block|
    self.attached_files += [attach_as]

    uploader_klass = maybe_uploader_klass[0]

    if opts[:follow]
      dependent = opts[:dependent]

      if dependent.nil? || ![:destroy, :ignore].include?(dependent)
        raise(ConfigurationError, "You must specify a :dependent option when using :follow. Use either :destroy or :ignore")
      end

      self.followers_per_leader_config = self.followers_per_leader_config.dup
      self.followers_per_leader_config[opts[:follow]] ||= []
      self.followers_per_leader_config[opts[:follow]].push({ attachment: attach_as, dependent: dependent })
    end

    if uploader_klass.nil? && block.nil?
      raise ConfigurationError, "you must provide either an UploaderClass or a block to define it."
    end

    uploader_klass = Class.new(Saviour::BaseUploader, &block) if block

    self.uploader_classes[attach_as] = uploader_klass

    mod = Module.new do
      define_method(attach_as) do
        instance_variable_get("@__uploader_#{attach_as}") || begin
          layer = persistence_klass.new(self)
          new_file = ::Saviour::File.new(uploader_klass, self, attach_as, layer.read(attach_as))

          instance_variable_set("@__uploader_#{attach_as}", new_file)
        end
      end

      define_method("#{attach_as}=") do |value|
        send(attach_as).assign(value)
      end

      define_method("#{attach_as}?") do
        send(attach_as).present?
      end

      define_method("#{attach_as}_was") do
        instance_variable_get("@__uploader_#{attach_as}_was")
      end

      define_method("#{attach_as}_changed?") do
        send(attach_as).changed?
      end

      define_method(:changed_attributes) do
        if send("#{attach_as}_changed?")
          super().merge(attach_as => send("#{attach_as}_was"))
        else
          super()
        end
      end

      define_method(:changes) do
        if send("#{attach_as}_changed?")
          super().merge(attach_as => send("#{attach_as}_change"))
        else
          super()
        end
      end

      define_method(:changed) do
        if ActiveRecord::VERSION::MAJOR == 6 && send("#{attach_as}_changed?")
          super() + [attach_as.to_s]
        else
          super()
        end
      end

      define_method(:changed?) do
        if ActiveRecord::VERSION::MAJOR == 6
          send("#{attach_as}_changed?") || super()
        else
          super()
        end
      end

      define_method("#{attach_as}_change") do
        [send("#{attach_as}_was"), send(attach_as)]
      end

      define_method("remove_#{attach_as}!") do |dependent: nil|
        if !dependent.nil? && ![:destroy, :ignore].include?(dependent)
          raise ArgumentError, ":dependent option must be either :destroy or :ignore"
        end

        layer = persistence_klass.new(self)

        attachment_remover = proc do |attach_as|
          layer.write(attach_as, nil)
          deletion_path = send(attach_as).persisted_path
          send(attach_as).delete

          work = proc do
            file = send(attach_as)
            file.uploader.storage.delete(deletion_path) if deletion_path && file.persisted_path.nil?
          end

          if ActiveRecord::Base.connection.current_transaction.open?
            DbHelpers.run_after_commit &work
          else
            work.call
          end
        end

        attachment_remover.call(attach_as)

        (self.class.followers_per_leader_config[attach_as] || []).each do |follower|
          dependent_option = dependent || follower[:dependent]
          next if dependent_option == :ignore || send(follower[:attachment]).changed?

          attachment_remover.call(follower[:attachment])
        end
      end
    end

    self.include mod
  end

  @klass.define_singleton_method("attached_followers_per_leader") do
    self.followers_per_leader_config.map do |leader, followers|
      [leader, followers.map { |data| data[:attachment] }]
    end.to_h
  end

  @klass.class_attribute :__saviour_validations
  @klass.__saviour_validations = Hash.new { [] }

  @klass.define_singleton_method("attach_validation") do |attach_as, method_name = nil, &block|
    self.__saviour_validations = self.__saviour_validations.dup
    self.__saviour_validations[attach_as] += [{ method_or_block: method_name || block, type: :memory }]
  end

  @klass.define_singleton_method("attach_validation_with_file") do |attach_as, method_name = nil, &block|
    self.__saviour_validations = self.__saviour_validations.dup
    self.__saviour_validations[attach_as] += [{ method_or_block: method_name || block, type: :file }]
  end
end