3 files changed, 67 insertions, 0 deletions
diff --git a/actiontext/lib/action_text/attachments/caching.rb b/actiontext/lib/action_text/attachments/caching.rb
new file mode 100644
index 0000000000..7c727bfc26
--- /dev/null
+++ b/actiontext/lib/action_text/attachments/caching.rb
@@ -0,0 +1,16 @@
+# frozen_string_literal: true
+
+module ActionText
+  module Attachments
+    module Caching
+      def cache_key(*args)
+        [self.class.name, cache_digest, *attachable.cache_key(*args)].join("/")
+      end
+
+      private
+        def cache_digest
+          Digest::SHA256.hexdigest(node.to_s)
+        end
+    end
+  end
+end
diff --git a/actiontext/lib/action_text/attachments/minification.rb b/actiontext/lib/action_text/attachments/minification.rb
new file mode 100644
index 0000000000..edc8f876d6
--- /dev/null
+++ b/actiontext/lib/action_text/attachments/minification.rb
@@ -0,0 +1,17 @@
+# frozen_string_literal: true
+
+module ActionText
+  module Attachments
+    module Minification
+      extend ActiveSupport::Concern
+
+      class_methods do
+        def fragment_by_minifying_attachments(content)
+          Fragment.wrap(content).replace(ActionText::Attachment::SELECTOR) do |node|
+            node.tap { |n| n.inner_html = "" }
+          end
+        end
+      end
+    end
+  end
+end
diff --git a/actiontext/lib/action_text/attachments/trix_conversion.rb b/actiontext/lib/action_text/attachments/trix_conversion.rb
new file mode 100644
index 0000000000..24937d6c22
--- /dev/null
+++ b/actiontext/lib/action_text/attachments/trix_conversion.rb
@@ -0,0 +1,34 @@
+# frozen_string_literal: true
+
+module ActionText
+  module Attachments
+    module TrixConversion
+      extend ActiveSupport::Concern
+
+      class_methods do
+        def fragment_by_converting_trix_attachments(content)
+          Fragment.wrap(content).replace(TrixAttachment::SELECTOR) do |node|
+            from_trix_attachment(TrixAttachment.new(node))
+          end
+        end
+
+        def from_trix_attachment(trix_attachment)
+          from_attributes(trix_attachment.attributes)
+        end
+      end
+
+      def to_trix_attachment(content = trix_attachment_content)
+        attributes = full_attributes.dup
+        attributes["content"] = content if content
+        TrixAttachment.from_attributes(attributes)
+      end
+
+      private
+        def trix_attachment_content
+          if partial_path = attachable.try(:to_trix_content_attachment_partial_path)
+            ActionText::Content.renderer.render(partial: partial_path, object: self, as: model_name.element)
+          end
+        end
+    end
+  end
+end