Revert "Merge branch 'refactor-can-be-merge' into 'master'"

This reverts commit 459e6d3467, reversing
changes made to 804168e1de.

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

app/models/merge_request.rb

@@ -209,7 +209,13 @@ class MergeRequest < ActiveRecord::Base
       if for_fork?
         Gitlab::Satellite::MergeAction.new(self.author, self).can_be_merged?
       else
-        project.repository.can_be_merged?(source_branch, target_branch)
+        rugged = project.repository.rugged
+        our_commit = rugged.branches[target_branch].target
+        their_commit = rugged.branches[source_branch].target
+
+        if our_commit && their_commit
+          !rugged.merge_commits(our_commit, their_commit).conflicts?
+        end
       end
 
     if can_be_merged

app/models/repository.rb

@@ -411,15 +411,6 @@ class Repository
     }
   end
 
-  def can_be_merged?(source_branch, target_branch)
-    our_commit = rugged.branches[target_branch].target
-    their_commit = rugged.branches[source_branch].target
-
-    if our_commit && their_commit
-      !rugged.merge_commits(our_commit, their_commit).conflicts?
-    end
-  end
-
   def search_files(query, ref)
     offset = 2
     args = %W(git grep -i -n --before-context #{offset} --after-context #{offset} #{query} #{ref || root_ref})

spec/models/repository_spec.rb

@@ -34,20 +34,6 @@ describe Repository do
     end
   end
 
-  describe :can_be_merged? do
-    context 'mergeable branches' do
-      subject { repository.can_be_merged?('feature', 'master') }
-
-      it { is_expected.to be_truthy }
-    end
-
-    context 'non-mergeable branches' do
-      subject { repository.can_be_merged?('feature_conflict', 'feature') }
-
-      it { is_expected.to be_falsey }
-    end
-  end
-
   describe "search_files" do
     let(:results) { repository.search_files('feature', 'master') }
     subject { results }