Added a start date to courses. Created a decorator to retrieve the course and check that it is open.

common/lib/xmodule/xmodule/course_module.py

@@ -1,3 +1,5 @@
+from datetime import datetime
+import dateutil.parser
 from fs.errors import ResourceNotFoundError
 import logging
 from path import path
@@ -13,6 +15,14 @@ log = logging.getLogger(__name__)
 class CourseDescriptor(SequenceDescriptor):
     module_class = SequenceModule
 
+    def __init__(self, system, definition=None, **kwargs):
+        super(CourseDescriptor, self).__init__(system, definition, **kwargs)
+        
+        self.start = dateutil.parser.parse(self.metadata["start"])
+    
+    def has_started(self):
+        return datetime.now() > self.start
+    
     @classmethod
     def id_to_location(cls, course_id):
         org, course, name = course_id.split('/')
@@ -24,7 +34,7 @@ class CourseDescriptor(SequenceDescriptor):
 
     @property
     def title(self):
-        self.metadata['display_name']
+        return self.metadata['display_name']
 
     @property
     def instructors(self):
@@ -69,6 +79,7 @@ class CourseDescriptor(SequenceDescriptor):
         elif section_key == "title":
             return self.metadata.get('display_name', self.name)
         elif section_key == "university":
+            return self.metadata.get('start')
             return self.location.org
         elif section_key == "number":
             return self.number

common/lib/xmodule/xmodule/x_module.py

@@ -214,7 +214,7 @@ class XModuleDescriptor(Plugin):
 
     # A list of metadata that this module can inherit from its parent module
     inheritable_metadata = (
-        'graded', 'due', 'graceperiod', 'showanswer', 'rerandomize',
+        'graded', 'start', 'due', 'graceperiod', 'showanswer', 'rerandomize',
 
         # This is used by the XMLModuleStore to provide for locations for static files,
         # and will need to be removed when that code is removed
@@ -251,6 +251,7 @@ class XModuleDescriptor(Plugin):
                 display_name: The name to use for displaying this module to the user
                 format: The format of this module ('Homework', 'Lab', etc)
                 graded (bool): Whether this module is should be graded or not
+                start (string): The date for which this module will be available
                 due (string): The due date for this module
                 graceperiod (string): The amount of grace period to allow when enforcing the due date
                 showanswer (string): When to show answers for this module

common/lib/xmodule/xmodule/xml_module.py

@@ -88,7 +88,7 @@ class XmlDescriptor(XModuleDescriptor):
     # The attributes will be removed from the definition xml passed
     # to definition_from_xml, and from the xml returned by definition_to_xml
     metadata_attributes = ('format', 'graceperiod', 'showanswer', 'rerandomize',
-        'due', 'graded', 'name', 'slug')
+        'start', 'due', 'graded', 'name', 'slug')
 
     # A dictionary mapping xml attribute names to functions of the value
     # that return the metadata key and value