Module: EchoUploads::PrmFileWriting::ClassMethods

Defined in:
lib/echo_uploads/prm_file_writing.rb

Instance Method Summary collapse

Instance Method Details

#echo_uploads_configure_prm_file_writing(attr, options) ⇒ Object 



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# File 'lib/echo_uploads/prm_file_writing.rb', line 17

def echo_uploads_configure_prm_file_writing(attr, options)
  define_model_callbacks :echo_uploads_write_prm
  
  # Save the file and the metadata after this model saves.
  after_save do |model|
    @echo_uploads_prm_files_saved ||= {}
    if (file = send(attr)).present? and @echo_uploads_prm_files_saved[attr.to_sym] != file
      run_callbacks :echo_uploads_write_prm do
        # A file is being uploaded during this request cycle. Further, we have not
        # already done the permanent file saving during this request cycle. (It's
        # not uncommon for a model to be saved twice in one request. If we ran this
        # code twice, we'd have duplicate effort at best and exceptions at worst.)
      
        @echo_uploads_prm_files_saved[attr.to_sym] = file
      
        if options[:multiple]
          metas = send("#{attr}_metadatas")
        else
          metas = [send("#{attr}_metadata")].compact
        end
      
        # metas is now an array of ::EchoUploads::File instances. The array may
        # be empty.
      
        if metas.any?
          # Previous permanent file(s) exist. This is a new version being uploaded.
          # Delete the old version(s).
          metas.each(&:destroy)
        end
      
        # No previous permanent files exists. The metas array is currently empty or
        # else contains deleted records. We need to rebuild that array by constructing
        # (but not yet saving) new EchoUploads::File objects.
      
        if options[:multiple]
          mapped_files = send("mapped_#{attr}") ||
            raise('echo_uploads called with :multiple, but :map option was missing')
          metas = mapped_files.map do |mapped_file|
            ::EchoUploads::File.new(
              owner: model, temporary: false, file: mapped_file
            )
          end
          send("#{attr}_metadatas=", metas)
        elsif options[:map]
          mapped_files = send("mapped_#{attr}")
          metas = [::EchoUploads::File.new(
            owner: model, temporary: false, file: mapped_files.first
          )]
          send("#{attr}_metadata=", metas.first)
        else
          metas = [::EchoUploads::File.new(
            owner: model, temporary: false, file: send(attr)
          )]
          send("#{attr}_metadata=", metas.first)
        end
      
        # metas is still an array of the EchoUploads::File instances. If the array was
        # initially empty (meaning no previous permanent file existed), then it has
        # since been populated.
      
        metas.each do |meta|
          meta.persist! attr, options
        end
      end
    elsif metas = send("#{attr}_tmp_metadata")
      run_callbacks :echo_uploads_write_prm do
        # A file has not been uploaded during this request cycle. However, the
        # submitted form "remembered" a temporary metadata record that was previously
        # saved.
      
        # Delete any existing metadata record. (It's possible we
        # were trying to replace an old version of the file, and there were validation
        # errors on the first attempt.)
      
        if options[:multiple]
          model.send("#{attr}_metadatas").each(&:destroy)
        elsif old = model.send("#{attr}_metadata")
          old.destroy
        end
      
        # We need not call persist! here, because the file is already persisted. (Nor
        # could we call it, because persist! requires an
        # ActionDispatch::HTTP::UploadedFile.) Mark the metadata record as permanent
        # and set its owner.
      
        metas.each do |meta|
          meta.owner = model
          meta.temporary = false
          meta.expires_at = nil
          meta.save!
        end
      
        if options[:multiple]
          send("#{attr}_metadatas=", metas)
        else
          send("#{attr}_metadata=", metas.first)
        end
      end
    end
  end
end