fixed issue 1318, as_yaml, thanks Alan

VERSION

@@ -1 +1 @@
-Version 2.4.1-alpha.2+timestamp.2013.02.03.09.10.34
+Version 2.4.1-alpha.2+timestamp.2013.02.04.09.27.30

gluon/dal.py

@@ -7610,6 +7610,12 @@ def index():
         d = self.as_dict(flat=True, sanitize=sanitize)
         return serializers.json(d)
 
+    def as_yaml(self, sanitize=True):
+        if not have_serializers:
+            raise ImportError("No YAML serializers available")
+        d = self.as_dict(flat=True, sanitize=sanitize)
+        return serializers.yaml(d)
+
     def __contains__(self, tablename):
         try:
             return tablename in self.tables
@@ -8521,6 +8527,12 @@ class Table(object):
         d = self.as_dict(flat=True, sanitize=sanitize)
         return serializers.json(d)
 
+    def as_yaml(self, sanitize=True):
+        if not have_serializers:
+            raise ImportError("No YAML serializers available")
+        d = self.as_dict(flat=True, sanitize=sanitize)
+        return serializers.yaml(d)
+
     def with_alias(self, alias):
         return self._db._adapter.alias(self,alias)
 
@@ -9229,6 +9241,13 @@ class Field(Expression):
         d = self.as_dict(flat=True, sanitize=sanitize)
         return json(d)
 
+    def as_yaml(self, sanitize=True):
+        if have_serializers:
+            d = self.as_dict(flat=True, sanitize=sanitize)
+            return serializers.yaml(d)
+        else:
+            raise ImportError("No YAML serializers available")
+
     def __nonzero__(self):
         return True
 

gluon/serializers.py

@@ -19,6 +19,11 @@ except ImportError:
     except:
         import contrib.simplejson as json_parser    # fallback to pure-Python module
 
+have_yaml = True
+try:
+    import yaml
+except ImportError:
+    have_yaml = False
 
 def loads_json(o):
     # deserialize a json string
@@ -119,3 +124,14 @@ def rss(feed):
                            pubDate=entry.get('created_on', now)
                            ) for entry in feed.get('entries', [])])
     return rss.to_xml(encoding='utf-8')
+
+def yaml(data):
+    if have_yaml:
+        return yaml.dump(data)
+    else: raise ImportError("No YAML serializer available")
+
+def loads_yaml(data):
+    if have_yaml:
+        return yaml.load(data)
+    else: raise ImportError("No YAML serializer available")
+