Reopened MRs should also be considered as open.

app/models/merge_request.rb

@@ -137,7 +137,7 @@ class MergeRequest < ActiveRecord::Base
   scope :by_milestone, ->(milestone) { where(milestone_id: milestone) }
   scope :in_projects, ->(project_ids) { where("source_project_id in (:project_ids) OR target_project_id in (:project_ids)", project_ids: project_ids) }
   scope :of_projects, ->(ids) { where(target_project_id: ids) }
-  scope :opened, -> { with_state(:opened) }
+  scope :opened, -> { with_states(:opened, :reopened) }
   scope :merged, -> { with_state(:merged) }
   scope :closed, -> { with_state(:closed) }
   scope :closed_and_merged, -> { with_states(:closed, :merged) }

spec/controllers/projects/merge_requests_controller_spec.rb

@@ -123,6 +123,40 @@ describe Projects::MergeRequestsController do
     end
   end
 
+  describe 'GET #index' do
+    def get_merge_requests
+      get :index,
+          namespace_id: project.namespace.to_param,
+          project_id: project.to_param,
+          state: 'opened'
+    end
+
+    context 'when filtering by opened state' do
+
+      context 'with opened merge requests' do
+        it 'should list those merge requests' do
+          get_merge_requests
+
+          expect(assigns(:merge_requests)).to include(merge_request)
+        end
+      end
+
+      context 'with reopened merge requests' do
+        before do
+          merge_request.close!
+          merge_request.reopen!
+        end
+
+        it 'should list those merge requests' do
+          get_merge_requests
+
+          expect(assigns(:merge_requests)).to include(merge_request)
+        end
+      end
+
+    end
+  end
+
   describe 'GET diffs' do
     def go(format: 'html')
       get :diffs,