Add ExactCountStrategy.

lib/gitlab/database/count.rb

@@ -57,6 +57,19 @@ module Gitlab
         ReltuplesCountStrategy.new(table_names).count
       end
 
+      class ExactCountStrategy
+        attr_reader :models
+        def initialize(models)
+          @models = models
+        end
+
+        def count
+          models.each_with_object({}) do |model, data|
+            data[model] = model.count
+          end
+        end
+      end
+
       class ReltuplesCountStrategy
         attr_reader :table_names
 

spec/lib/gitlab/database/count_spec.rb

@@ -66,6 +66,16 @@ describe Gitlab::Database::Count do
           expect(described_class.approximate_counts(models)).to eq({ Project => 3, Identity => 1 })
         end
       end
+
+      describe Gitlab::Database::Count::ExactCountStrategy do
+        subject { described_class.new(models).count }
+
+        it 'counts all models' do
+          models.each { |model| expect(model).to receive(:count).and_call_original }
+
+          expect(subject).to eq({ Project => 3, Identity => 1 })
+        end
+      end
     end
   end
 end