Properly convert complex return types.

Attached tests.

lib/route-helper.js

@@ -124,7 +124,9 @@ var routeHelper = module.exports = {
 
     var apiDoc = {
       path: routeHelper.convertPathFragments(route.path),
-      operations: [{
+      // Create the operation doc. Use `extendWithType` to add the necessary
+      // `items` and `format` fields.
+      operations: [routeHelper.extendWithType({
         method: routeHelper.convertVerb(route.verb),
         // [rfeng] Swagger UI doesn't escape '.' for jQuery selector
         nickname: route.method.replace(/\./g, '_'), 
@@ -137,10 +139,10 @@ var routeHelper = module.exports = {
         responseMessages: [], 
         summary: route.description, // TODO(schoon) - Excerpt?
         notes: '' // TODO(schoon) - `description` metadata?
-      }]
+      })]
     };
-    // Convert types and return.
-    return routeHelper.extendWithType(apiDoc);
+
+    return apiDoc;
   },
 
   convertPathFragments: function convertPathFragments(path) {

test/route-helper.test.js

@@ -53,6 +53,28 @@ describe('route-helper', function() {
     expect(paramDoc.format).to.equal('byte');
   });
 
+  it('correctly converts return types (arrays)', function() {
+    var doc = createAPIDoc({
+      returns: [
+        {arg: 'data', type: ['customType']}
+      ]
+    });
+    var opDoc = doc.operations[0];
+    expect(opDoc.type).to.equal('array');
+    expect(opDoc.items).to.eql({type: 'customType'});
+  });
+
+  it('correctly converts return types (format)', function() {
+    var doc = createAPIDoc({
+      returns: [
+        {arg: 'data', type: 'buffer'}
+      ]
+    });
+    var opDoc = doc.operations[0];
+    expect(opDoc.type).to.equal('string');
+    expect(opDoc.format).to.equal('byte');
+  });
+
 });
 
 // Easy wrapper around createRoute