extend conditional module to add require_attempted

common/lib/xmodule/xmodule/capa_module.py

@@ -403,6 +403,10 @@ class CapaModule(XModule):
         # return self.answer_available()
         return self.lcp.done
 
+    def is_attempted(self):
+        # used by conditional module
+        return self.attempts > 0
+
     def answer_available(self):
         ''' Is the user allowed to see an answer?
         '''

common/lib/xmodule/xmodule/conditional_module.py

@@ -19,6 +19,10 @@ class ConditionalModule(XModule):
             <video url_name="secret_video" />
         </conditional>
 
+        <conditional condition="require_attempted" required="tag/url_name1&tag/url_name2">
+            <video url_name="secret_video" />
+        </conditional>
+
     '''
 
     js = {'coffee': [resource_string(__name__, 'js/src/conditional/display.coffee'),
@@ -67,6 +71,18 @@ class ConditionalModule(XModule):
                 else:
                     log.debug('conditional module: %s IS completed' % module)
             return True
+        elif self.condition=='require_attempted':
+            # all required modules must be attempted, as determined by
+            # the modules .is_attempted() method
+            for module in self.required_modules:
+                if not hasattr(module, 'is_attempted'):
+                    raise Exception('Error in conditional module: required module %s has no .is_attempted() method' % module)
+                if not module.is_attempted():
+                    log.debug('conditional module: %s not completed' % module)
+                    return False
+                else:
+                    log.debug('conditional module: %s IS completed' % module)
+            return True
         else:
             raise Exception('Error in conditional module: unknown condition "%s"' % self.condition)
 
@@ -128,4 +144,4 @@ class ConditionalDescriptor(SequenceDescriptor):
         """Returns a list of XModuleDescritpor instances upon which this module depends, but are
         not children of this module"""
         return [self.system.load_item(loc) for loc in self.required_module_locations]
-    
\ No newline at end of file
+