1 files changed, 21 insertions, 0 deletions
diff --git a/app/models/legacy_diff_discussion.rb b/app/models/legacy_diff_discussion.rb
new file mode 100644
index 00000000000..e13f17abdbe
--- /dev/null
+++ b/app/models/legacy_diff_discussion.rb
@@ -0,0 +1,21 @@
+class LegacyDiffDiscussion < DiffDiscussion
+  def self.unique_position_identifier(note)
+    note.line_code
+  end
+
+  def self.build_original_discussion_id(note)
+    Discussion.build_original_discussion_id(note)
+  end
+
+  def legacy_diff_discussion?
+    true
+  end
+
+  def potentially_resolvable?
+    false
+  end
+
+  def collapsed?
+    !active?
+  end
+end