Apply attr_map translation to metadata loaded from policy file as well as from xml.

common/lib/xmodule/xmodule/tests/test_import.py

@@ -236,6 +236,10 @@ class ImportTestCase(unittest.TestCase):
         # Also check that the grading policy loaded
         self.assertEqual(two_toys.grade_cutoffs['C'], 0.5999)
 
+        # Also check that keys from policy are run through the
+        # appropriate attribute maps -- 'graded' should be True, not 'true'
+        self.assertEqual(toy.metadata['graded'], True)
+
 
     def test_definition_loading(self):
         """When two courses share the same org and course name and

common/lib/xmodule/xmodule/xml_module.py

@@ -96,10 +96,13 @@ class XmlDescriptor(XModuleDescriptor):
 
     # A dictionary mapping xml attribute names AttrMaps that describe how
     # to import and export them
+    # Allow json to specify either the string "true", or the bool True.  The string is preferred.
+    to_bool = lambda val: val == 'true' or val == True
+    from_bool = lambda val: str(val).lower()
+    bool_map = AttrMap(to_bool, from_bool)
     xml_attribute_map = {
         # type conversion: want True/False in python, "true"/"false" in xml
-        'graded': AttrMap(lambda val: val == 'true',
-                          lambda val: str(val).lower()),
+        'graded': bool_map,
     }
 
 
@@ -232,6 +235,16 @@ class XmlDescriptor(XModuleDescriptor):
 
 
     @classmethod
+    def apply_policy(cls, metadata, policy):
+        """
+        Add the keys in policy to metadata, after processing them
+        through the attrmap.  Updates the metadata dict in place.
+        """
+        for attr in policy:
+            attr_map = cls.xml_attribute_map.get(attr, AttrMap())
+            metadata[attr] = attr_map.from_xml(policy[attr])
+
+    @classmethod
     def from_xml(cls, xml_data, system, org=None, course=None):
         """
         Creates an instance of this descriptor from the supplied xml_data.
@@ -279,7 +292,7 @@ class XmlDescriptor(XModuleDescriptor):
         # Set/override any metadata specified by policy
         k = policy_key(location)
         if k in system.policy:
-            metadata.update(system.policy[k])
+            cls.apply_policy(metadata, system.policy[k])
 
         return cls(
             system,

common/test/data/toy/policies/2012_Fall.json

@@ -2,7 +2,8 @@
     "course/2012_Fall": {
         "graceperiod": "2 days 5 hours 59 minutes 59 seconds",
         "start": "2015-07-17T12:00",
-        "display_name": "Toy Course"
+        "display_name": "Toy Course",
+        "graded": "true"
     },
     "chapter/Overview": {
         "display_name": "Overview"