Add icon into category

backend/app/controllers/spree/admin/taxonomy/attachment_controller.rb

@@ -0,0 +1,20 @@
+# frozen_string_literal: true
+
+module Spree
+  module Admin
+    module Taxonomies
+      class AttachmentController < Spree::Admin::BaseController
+        def destroy
+          taxonomy = Spree::Taxonomy.find(params[:taxonomy_id])
+          taxon = taxonomy.taxons.find(params[:taxon_id])
+          if taxon.destroy_attachment(params[:attachment_definition])
+            flash[:success] = t('spree.successfully_removed', resource: params[:attachment_definition].titleize)
+          else
+            flash[:error] = t('spree.taxon_attachment_removal_error')
+          end
+          redirect_to edit_admin_taxonomy_taxon_path(taxonomy, taxon.id)
+        end
+      end
+    end
+  end
+end

core/app/models/spree/taxonomy/active_storage_attachment.rb

@@ -0,0 +1,13 @@
+# frozen_string_literal: true
+
+module Spree::Taxonomy::ActiveStorageAttachment
+  extend ActiveSupport::Concern
+  include Spree::ActiveStorageAdapter
+
+  included do
+    has_attachment :icon,
+                   styles: Spree::Config.taxon_image_styles,
+                   default_style: Spree::Config.taxon_image_style_default
+    validate :icon_is_an_image
+  end
+end

core/app/models/spree/taxonomy/paperclip_attachment.rb

@@ -0,0 +1,30 @@
+# frozen_string_literal: true
+
+module Spree::Taxonomy::PaperclipAttachment
+  extend ActiveSupport::Concern
+
+  included do
+    has_attached_file :icon,
+      styles: Spree::Config.taxon_image_styles,
+      default_style: Spree::Config.taxon_image_style_default,
+      url: '/spree/taxonomies/:id/:style/:basename.:extension',
+      path: ':rails_root/public/spree/taxonomies/:id/:style/:basename.:extension',
+      default_url: '/assets/default_taxon.png'
+
+    validates_attachment :icon,
+      content_type: { content_type: Spree::Config.allowed_image_mime_types }
+  end
+
+  def icon_present?
+    icon.present?
+  end
+
+  def destroy_attachment(definition)
+    return false unless respond_to?(definition)
+
+    attached_file = send(definition)
+    return false unless attached_file.exists?
+
+    attached_file.destroy && save
+  end
+end