Improve MR building

* fix 500 error when no parent for initial commit
* fix link from diff files to wrong commit

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

1 files changed, 16 insertions, 0 deletions

diff --git a/app/models/repository.rb b/app/models/repository.rb
index 2ff70c248dc..d9b0d1fbe22 100644
--- a/app/models/repository.rb
+++ b/app/models/repository.rb
@@ -263,4 +263,20 @@ class Repository
       contributor
     end
   end
+
+  def blob_for_diff(commit, diff)
+    file = blob_at(commit.id, diff.new_path)
+
+    unless file
+      file = prev_blob_for_diff(commit, diff)
+    end
+
+    file
+  end
+
+  def prev_blob_for_diff(commit, diff)
+    if commit.parent_id
+      blob_at(commit.parent_id, diff.old_path)
+    end
+  end
 end