Fix MR discussion not loaded issue51958-fix-mr-discussion-loading

Display `formatter` as the sole content of `position` object.
This means `diff_file` data is not referenced, which is the
caseu of "IOError: not opened for reading".

1 files changed, 4 insertions, 0 deletions

diff --git a/lib/gitlab/diff/position.rb b/lib/gitlab/diff/position.rb
index fc280f96ec1..f967494199e 100644
--- a/lib/gitlab/diff/position.rb
+++ b/lib/gitlab/diff/position.rb
@@ -69,6 +69,10 @@ module Gitlab
         JSON.generate(formatter.to_h, opts)
       end
 
+      def as_json(opts = nil)
+        to_h.as_json(opts)
+      end
+
       def type
         formatter.line_age
       end