fix(test): method builder examples work now

It was easier than expected, but in the end needs quite some custom
code and handling. Good to have mako (and python !!!)

gen/youtube3/README.md

@@ -97,6 +97,8 @@ let mut hub = YouTube::new(hyper::Client::new(), auth);
 
 ## About Customization/Callbacks
 
+## About Optionals in parts (needed for Json, otherwise I'd happily drop them)
+
 [builder-pattern]: http://en.wikipedia.org/wiki/Builder_pattern
 [google-go-api]: https://github.com/google/google-api-go-client
 

src/mako/lib/lib.mako

@@ -68,6 +68,8 @@ ${'##'} About error handling
 
 ${'##'} About Customization/Callbacks
 
+${'##'} About Optionals in parts (needed for Json, otherwise I'd happily drop them)
+
 [builder-pattern]: http://en.wikipedia.org/wiki/Builder_pattern
 [google-go-api]: https://github.com/google/google-api-go-client
 </%def>

src/mako/lib/mbuild.mako

@@ -63,9 +63,13 @@ ${capture(lib.test_hub, hub_type_name, comments=False) | hide_rust_doc_test}
 let mut ${rb_name}: ${request_value.id} = Default::default();
 % for spn, sp in request_value.get('properties', dict()).iteritems():
 <%
-    assignment = rvfrt(spn, sp)
+    assignment = rvfrt(spn, sp, request_value.id)
     if is_string_value(assignment):
         assignment = assignment + '.to_string()'
+    if assignment.endswith('default()'):
+        assignment = assignment[1:] # cut & - it's not ok in this case :)!
+    else:
+        assignment = 'Some(%s)' % assignment
 %>\
 ## ${to_rust_type(request_value.id, spn, sp, allow_optionals=False)}
 ${rb_name}.${mangle_ident(spn)} = ${assignment};

src/mako/lib/util.py

@@ -489,6 +489,4 @@ def rnd_arg_val_for_type(tn):
     try:
         return str(RUST_TYPE_RND_MAP[tn]())
     except KeyError:
-        # be verbose to show actual type ! It's for documentation, after all, people should see what's going on
-        # right away without another lookup
-        return '&<%s as Default>::default()' % tn
+        return '&Default::default()'