Add attachment component

app/components/koi/tables/body.rb

@@ -114,6 +114,21 @@ def rendered_value
           value.present? ? image_tag(value.variant(@variant)) : ""
         end
       end
+
+      # Shows an attachment in a cell
+      #
+      # If it is representable, shows as a image tag(assumes a variant called :thumb is defined for the attachment)
+      #
+      # Otherwise shows as a link to download
+      class AttachmentComponent < BodyCellComponent
+        def rendered_value
+          if value.representable?
+            image_tag(value.variant(:thumb))
+          else
+            link_to value.blob.filename, rails_blob_path(value, disposition: :attachment)
+          end
+        end
+      end
     end
   end
 end

app/components/koi/tables/body_row_component.rb

@@ -39,6 +39,10 @@ def text(attribute, **options, &block)
       def image(attribute, variant: :thumb, **options, &block)
         with_column(Body::ImageComponent.new(@table, @record, attribute, variant:, **options), &block)
       end
+
+      def attachment(attribute, **options, &block)
+        with_column(Body::AttachmentComponent.new(@table, @record, attribute, **options), &block)
+      end
     end
   end
 end

app/components/koi/tables/header_row_component.rb

@@ -33,6 +33,10 @@ def link(attribute, **attributes, &block)
         header_cell(attribute, **attributes, &block)
       end
 
+      def attachment(attribute, **attributes, &block)
+        header_cell(attribute, type: :link, **attributes, &block)
+      end
+
       def text(attribute, **attributes, &block)
         header_cell(attribute, **attributes, &block)
       end

lib/generators/koi/admin_views/admin_views_generator.rb

@@ -79,7 +79,7 @@ def index_attribute_for(attribute)
       when :rich_text
         %(<% row.rich_text :#{attribute.name} %>)
       when :attachment
-        %(<% row.image :#{attribute.name} %>)
+        %(<% row.attachment :#{attribute.name} %>)
       else
         %(<% row.text :#{attribute.name} %>)
       end

spec/components/koi/tables/body_spec.rb

@@ -124,4 +124,13 @@
       HTML
     end
   end
+
+  describe Koi::Tables::Body::AttachmentComponent do
+    it "renders column with a preview of the image" do
+      record    = create(:banner, :with_image)
+      component = described_class.new(table, record, :image)
+      rendered  = render_inline(component)
+      expect(rendered).to have_css("td > img[src*='dummy.png']")
+    end
+  end
 end

spec/templates/app/views/admin/banners/_banner.html+row.erb

@@ -1,2 +1,3 @@
 <% row.ordinal %>
 <% row.link :name %>
+<% row.image :image %>