Support multiple file upload for ActiveStorage and CarrierWave

Refs. #2990, Refs. #3037, Closes #2555, Closes #2916, Closes #3036

Author: mshibuya

app/assets/javascripts/rails_admin/ra.widgets.coffee

@@ -70,6 +70,23 @@ $(document).on 'rails_admin.dom_ready', (e, content) ->
       else
         image_container.hide()
 
+    # multiple-fileupload-preview
+
+    content.find('[data-multiple-fileupload]').change ->
+      input = this
+      $("#" + input.id).parent().children(".preview").remove()
+      for file in input.files
+        ext = file.name.split('.').pop().toLowerCase()
+        if $.inArray(ext, ['gif','png','jpg','jpeg','bmp']) == -1
+          continue
+        image_container = $('<img />').addClass('preview').addClass('img-thumbnail')
+        do (image_container) ->
+          reader = new FileReader()
+          reader.onload = (e) ->
+            image_container.attr "src", e.target.result
+          reader.readAsDataURL file
+          $("#" + input.id).parent().append($('<div></div>').addClass('preview').append(image_container))
+
     # filtering-multiselect
 
     content.find('[data-filteringmultiselect]').each ->

app/views/rails_admin/main/_form_multiple_file_upload.html.haml

@@ -0,0 +1,14 @@
+- field.attachments.each_with_index do |attachment, i|
+  .toggle
+    = attachment.pretty_value
+    - if field.delete_method
+      %a.btn.btn-info.btn-remove-image{href: '#', :'data-toggle' => 'button', role: 'button', onclick: "$(this).siblings('[type=checkbox]').click(); $(this).parent('.toggle').toggle('slow'); jQuery(this).toggleClass('btn-danger btn-info'); return false;"}
+        %i.icon-white.icon-trash
+        = I18n.t('admin.actions.delete.menu').capitalize + " #{field.label.downcase} ##{i + 1}"
+
+      = form.check_box(field.delete_method, {multiple:true, style: 'display:none;'}, attachment.delete_key, nil)
+
+= form.file_field(field.name, field.html_attributes.reverse_merge({ data: { "multiple-fileupload": true }, multiple: true }))
+
+- if field.cache_method
+  = form.hidden_field(field.cache_method)

lib/rails_admin/config/fields/factories/active_storage.rb

@@ -3,18 +3,25 @@
 require 'rails_admin/config/fields/types/file_upload'
 
 RailsAdmin::Config::Fields.register_factory do |parent, properties, fields|
-  if defined?(::ActiveStorage) && properties.is_a?(RailsAdmin::Adapters::ActiveRecord::Association) && (match = /\A(.+)_attachment\Z/.match properties.name) && properties.klass.to_s == 'ActiveStorage::Attachment'
+  if defined?(::ActiveStorage) && properties.is_a?(RailsAdmin::Adapters::ActiveRecord::Association) && (match = /\A(.+)_attachments?\Z/.match properties.name) && properties.klass.to_s == 'ActiveStorage::Attachment'
     name = match[1]
-    field = RailsAdmin::Config::Fields::Types.load(:active_storage).new(parent, name, properties)
+    field = RailsAdmin::Config::Fields::Types.load(
+      properties.type == :has_many ? :multiple_active_storage : :active_storage,
+    ).new(parent, name, properties)
     fields << field
-    associations = ["#{name}_attachment".to_sym, "#{name}_blob".to_sym]
+    associations =
+      if properties.type == :has_many
+        ["#{name}_attachments".to_sym, "#{name}_blobs".to_sym]
+      else
+        ["#{name}_attachment".to_sym, "#{name}_blob".to_sym]
+      end
     children_fields = associations.map do |child_name|
       next unless child_association = parent.abstract_model.associations.detect { |p| p.name.to_sym == child_name }
       child_field = fields.detect { |f| f.name == child_name } || RailsAdmin::Config::Fields.default_factory.call(parent, child_association, fields)
       child_field.hide unless field == child_field
       child_field.filterable(false) unless field == child_field
       child_field.name
-    end.flatten
+    end.flatten.compact
     field.children_fields(children_fields)
     true
   else

lib/rails_admin/config/fields/factories/carrierwave.rb

@@ -6,7 +6,9 @@
   model = parent.abstract_model.model
   if defined?(::CarrierWave) && model.is_a?(CarrierWave::Mount) && model.uploaders.include?(attachment_name = properties.name.to_s.chomp('_file_name').to_sym)
     columns = [model.uploader_options[attachment_name][:mount_on] || attachment_name, "#{attachment_name}_content_type".to_sym, "#{attachment_name}_file_size".to_sym]
-    field = RailsAdmin::Config::Fields::Types.load(:carrierwave).new(parent, attachment_name, properties)
+    field = RailsAdmin::Config::Fields::Types.load(
+      [:serialized, :json].include?(properties.type) ? :multiple_carrierwave : :carrierwave,
+    ).new(parent, attachment_name, properties)
     fields << field
     children_fields = []
     columns.each do |children_column_name|

lib/rails_admin/config/fields/types/all.rb

@@ -12,6 +12,9 @@
 require 'rails_admin/config/fields/types/paperclip'
 require 'rails_admin/config/fields/types/carrierwave'
 require 'rails_admin/config/fields/types/refile'
+require 'rails_admin/config/fields/types/multiple_file_upload'
+require 'rails_admin/config/fields/types/multiple_active_storage'
+require 'rails_admin/config/fields/types/multiple_carrierwave'
 require 'rails_admin/config/fields/types/float'
 require 'rails_admin/config/fields/types/has_and_belongs_to_many_association'
 require 'rails_admin/config/fields/types/has_many_association'

lib/rails_admin/config/fields/types/multiple_active_storage.rb

@@ -0,0 +1,49 @@
+require 'rails_admin/config/fields/types/multiple_file_upload'
+
+module RailsAdmin
+  module Config
+    module Fields
+      module Types
+        class MultipleActiveStorage < RailsAdmin::Config::Fields::Types::MultipleFileUpload
+          RailsAdmin::Config::Fields::Types.register(self)
+
+          class ActiveStorageAttachment < RailsAdmin::Config::Fields::Types::MultipleFileUpload::AbstractAttachment
+            register_instance_option :thumb_method do
+              {resize: '100x100>'}
+            end
+
+            register_instance_option :delete_key do
+              value.id
+            end
+
+            register_instance_option :image? do
+              if value
+                value.filename.to_s.split('.').last =~ /jpg|jpeg|png|gif|svg/i
+              end
+            end
+
+            def resource_url(thumb = false)
+              return nil unless value
+              if thumb && value.variable?
+                variant = value.variant(thumb_method)
+                Rails.application.routes.url_helpers.rails_blob_representation_path(
+                  variant.blob.signed_id, variant.variation.key, variant.blob.filename, only_path: true
+                )
+              else
+                Rails.application.routes.url_helpers.rails_blob_path(value, only_path: true)
+              end
+            end
+          end
+
+          register_instance_option :attachment_class do
+            ActiveStorageAttachment
+          end
+
+          register_instance_option :delete_method do
+            "remove_#{name}" if bindings[:object].respond_to?("remove_#{name}")
+          end
+        end
+      end
+    end
+  end
+end

lib/rails_admin/config/fields/types/multiple_carrierwave.rb

@@ -0,0 +1,44 @@
+require 'rails_admin/config/fields/types/multiple_file_upload'
+
+module RailsAdmin
+  module Config
+    module Fields
+      module Types
+        class MultipleCarrierwave < RailsAdmin::Config::Fields::Types::MultipleFileUpload
+          RailsAdmin::Config::Fields::Types.register(self)
+
+          class CarrierwaveAttachment < RailsAdmin::Config::Fields::Types::MultipleFileUpload::AbstractAttachment
+            register_instance_option :thumb_method do
+              @thumb_method ||= ((versions = value.versions.keys).detect { |k| k.in?([:thumb, :thumbnail, 'thumb', 'thumbnail']) } || versions.first.to_s)
+            end
+
+            register_instance_option :delete_key do
+              value.file.identifier
+            end
+
+            def resource_url(thumb = false)
+              return nil unless value
+              thumb.present? ? value.send(thumb).url : value.url
+            end
+          end
+
+          register_instance_option :attachment_class do
+            CarrierwaveAttachment
+          end
+
+          register_instance_option :cache_method do
+            "#{name}_cache"
+          end
+
+          register_instance_option :delete_method do
+            "delete_#{name}" if bindings[:object].respond_to?("delete_#{name}")
+          end
+
+          def value
+            bindings[:object].send(name)
+          end
+        end
+      end
+    end
+  end
+end

lib/rails_admin/config/fields/types/multiple_file_upload.rb

@@ -0,0 +1,106 @@
+module RailsAdmin
+  module Config
+    module Fields
+      module Types
+        class MultipleFileUpload < RailsAdmin::Config::Fields::Base
+          RailsAdmin::Config::Fields::Types.register(self)
+
+          class AbstractAttachment
+            include RailsAdmin::Config::Proxyable
+            include RailsAdmin::Config::Configurable
+
+            attr_reader :value
+
+            def initialize(value)
+              @value = value
+            end
+
+            register_instance_option :thumb_method do
+              nil
+            end
+
+            register_instance_option :delete_key do
+              nil
+            end
+
+            register_instance_option :export_value do
+              resource_url.to_s
+            end
+
+            register_instance_option :pretty_value do
+              if value.presence
+                v = bindings[:view]
+                url = resource_url
+                if image
+                  thumb_url = resource_url(thumb_method)
+                  image_html = v.image_tag(thumb_url, class: 'img-thumbnail')
+                  url != thumb_url ? v.link_to(image_html, url, target: '_blank') : image_html
+                else
+                  v.link_to(value, url, target: '_blank')
+                end
+              end
+            end
+
+            register_instance_option :image? do
+              (url = resource_url.to_s) && url.split('.').last =~ /jpg|jpeg|png|gif|svg/i
+            end
+
+            def resource_url
+              raise('not implemented')
+            end
+          end
+
+          def initialize(*args)
+            super
+            @attachment_configurations = []
+          end
+
+          register_instance_option :attachment_class do
+            AbstractAttachment
+          end
+
+          register_instance_option :partial do
+            :form_multiple_file_upload
+          end
+
+          register_instance_option :cache_method do
+            nil
+          end
+
+          register_instance_option :delete_method do
+            nil
+          end
+
+          register_instance_option :allowed_methods do
+            [method_name, cache_method, delete_method].compact
+          end
+
+          register_instance_option :html_attributes do
+            {
+              required: required? && !value.present?,
+            }
+          end
+
+          def attachment(&block)
+            @attachment_configurations << block
+          end
+
+          def attachments
+            Array(value).map do |attached|
+              attachment = attachment_class.new(attached).with(bindings)
+              @attachment_configurations.each do |config|
+                attachment.instance_eval(&config)
+              end
+              attachment
+            end
+          end
+
+          # virtual class
+          def virtual?
+            true
+          end
+        end
+      end
+    end
+  end
+end

spec/controllers/rails_admin/main_controller_spec.rb

@@ -378,6 +378,9 @@ class TeamWithNumberedPlayers < Team
     it 'allows for delete method with Carrierwave' do
       RailsAdmin.config FieldTest do
         field :carrierwave_asset
+        field :carrierwave_assets do
+          delete_method :delete_carrierwave_assets
+        end
         field :dragonfly_asset
         field :paperclip_asset do
           delete_method :delete_paperclip_asset
@@ -386,34 +389,43 @@ class TeamWithNumberedPlayers < Team
         field :active_storage_asset do
           delete_method :remove_active_storage_asset
         end if defined?(ActiveStorage)
+        field :active_storage_assets do
+          delete_method :remove_active_storage_assets
+        end if defined?(ActiveStorage)
       end
       controller.params = HashWithIndifferentAccess.new(
         'field_test' => {
           'carrierwave_asset' => 'test',
           'carrierwave_asset_cache' => 'test',
           'remove_carrierwave_asset' => 'test',
+          'carrierwave_assets' => 'test',
+          'carrierwave_assets_cache' => 'test',
+          'delete_carrierwave_assets' => 'test',
           'dragonfly_asset' => 'test',
           'remove_dragonfly_asset' => 'test',
           'retained_dragonfly_asset' => 'test',
           'paperclip_asset' => 'test',
           'delete_paperclip_asset' => 'test',
           'should_not_be_here' => 'test',
         }.merge(defined?(Refile) ? {'refile_asset' => 'test', 'remove_refile_asset' => 'test'} : {}).
-          merge(defined?(ActiveStorage) ? {'active_storage_asset' => 'test', 'remove_active_storage_asset' => 'test'} : {}),
+          merge(defined?(ActiveStorage) ? {'active_storage_asset' => 'test', 'remove_active_storage_asset' => 'test', 'active_storage_assets' => 'test', 'remove_active_storage_assets' => 'test'} : {}),
       )
 
       controller.send(:sanitize_params_for!, :create, RailsAdmin.config(FieldTest), controller.params['field_test'])
       expect(controller.params[:field_test].to_h).to eq({
         'carrierwave_asset' => 'test',
         'remove_carrierwave_asset' => 'test',
         'carrierwave_asset_cache' => 'test',
+        'carrierwave_assets' => 'test',
+        'carrierwave_assets_cache' => 'test',
+        'delete_carrierwave_assets' => 'test',
         'dragonfly_asset' => 'test',
         'remove_dragonfly_asset' => 'test',
         'retained_dragonfly_asset' => 'test',
         'paperclip_asset' => 'test',
         'delete_paperclip_asset' => 'test',
       }.merge(defined?(Refile) ? {'refile_asset' => 'test', 'remove_refile_asset' => 'test'} : {}).
-        merge(defined?(ActiveStorage) ? {'active_storage_asset' => 'test', 'remove_active_storage_asset' => 'test'} : {}))
+        merge(defined?(ActiveStorage) ? {'active_storage_asset' => 'test', 'remove_active_storage_asset' => 'test', 'active_storage_assets' => 'test', 'remove_active_storage_assets' => 'test'} : {}))
     end
 
     it 'allows for polymorphic associations parameters' do

spec/dummy_app/app/active_record/field_test.rb

@@ -10,13 +10,42 @@ class FieldTest < ActiveRecord::Base
   before_validation { self.paperclip_asset = nil if delete_paperclip_asset == '1' }
 
   dragonfly_accessor :dragonfly_asset
+
   mount_uploader :carrierwave_asset, CarrierwaveUploader
+  mount_uploaders :carrierwave_assets, CarrierwaveUploader
+  serialize :carrierwave_assets, JSON
+  attr_accessor :delete_carrierwave_assets
+  after_validation do
+    uploaders = carrierwave_assets.delete_if do |uploader|
+      if Array(delete_carrierwave_assets).include?(uploader.file.identifier)
+        uploader.remove!
+        true
+      end
+    end
+    write_attribute(:carrierwave_assets, uploaders.map { |uploader| uploader.file.identifier })
+  end
+  def carrierwave_assets=(files)
+    appended = files.map do |file|
+      uploader = _mounter(:carrierwave_assets).blank_uploader
+      uploader.cache! file
+      uploader
+    end
+    super(carrierwave_assets + appended)
+  end
 
   attachment :refile_asset if defined?(Refile)
 
-  has_one_attached :active_storage_asset if defined?(ActiveStorage)
-  attr_accessor :remove_active_storage_asset
-  after_save { active_storage_asset.purge if remove_active_storage_asset == '1' }
+  if defined?(ActiveStorage)
+    has_one_attached :active_storage_asset
+    attr_accessor :remove_active_storage_asset
+    after_save { active_storage_asset.purge if remove_active_storage_asset == '1' }
+
+    has_many_attached :active_storage_assets
+    attr_accessor :remove_active_storage_assets
+    after_save do
+      Array(remove_active_storage_assets).each { |id| active_storage_assets.find_by_id(id).try(:purge) }
+    end
+  end
 
   if ::Rails.version >= '4.1' # enum support was added in Rails 4.1
     enum string_enum_field: {S: 's', M: 'm', L: 'l'}