Use commit finder instead of rev parse

This has the side effect of making this method rugged call free, which is the reason I actually changed this.

Use commit finder instead of rev parse
020a8482 · Zeger-Jan van de Weg · 3b6fba72 · 020a8482
Unverified Commit 020a8482 authored Dec 01, 2017 by Zeger-Jan van de Weg
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repository.rb app/models/repository.rb +1 -1

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--- a/app/models/repository.rb
+++ b/app/models/repository.rb
@@ -256,7 +256,7 @@ class Repository
  end

  def diverging_commit_counts(branch)
-    root_ref_hash = raw_repository.rev_parse_target(root_ref).oid
+    root_ref_hash = raw_repository.commit(root_ref).id
    cache.fetch(:"diverging_commit_counts_#{branch.name}") do
      # Rugged seems to throw a `ReferenceError` when given branch_names rather
      # than SHA-1 hashes