PR for issue #1578

lib/grape/endpoint.rb

@@ -265,7 +265,10 @@ def run
         run_filters afters, :after
         cookies.write(header)
 
-        # The Body commonly is an Array of Strings, the application instance itself, or a File-like object.
+        #status verifies body presence when DELETE
+        @body ||= response_object if response_object.present?
+
+        # The Body commonly is an Array of Strings, the application instance itself, or a File-like object
         response_object = file || [body || response_object]
         [status, header, response_object]
       end

spec/grape/endpoint_spec.rb

@@ -1149,6 +1149,39 @@ def memoized
       end
     end
 
+    describe 'delete 200, with a return value (no explicit body)' do
+      it 'responds to /example delete method' do
+        subject.send(:delete, '/example', anchor: false) do
+          'deleted'
+        end
+        send(:delete, '/example/')
+        expect(last_response.status).to eql 200
+        expect(last_response.body).not_to be_empty
+      end
+    end
+
+    describe 'delete 204, with nil has return value (no explicit body)' do
+      it 'responds to /example delete method' do
+        subject.send(:delete, '/example', anchor: false) do
+          nil
+        end
+        send(:delete, '/example/')
+        expect(last_response.status).to eql 204
+        expect(last_response.body).to be_empty
+      end
+    end
+
+    describe 'delete 204, with empty array has return value (no explicit body)' do
+      it 'responds to /example delete method' do
+        subject.send(:delete, '/example', anchor: false) do
+          ''
+        end
+        send(:delete, '/example/')
+        expect(last_response.status).to eql 204
+        expect(last_response.body).to be_empty
+      end
+    end
+
     describe 'all other' do
       %w(post get head put options patch).each do |verb|
         it "allows for the anchoring option with a #{verb.upcase} method" do