Taking Ike's delete-student-state-for-problem code and putting it in a separate…

Taking Ike's delete-student-state-for-problem code and putting it in a separate PR so it's not bundled with more debated features.

lms/djangoapps/instructor/views.py

@@ -195,7 +195,7 @@ def instructor_dashboard(request, course_id):
         track.views.server_track(request, 'dump-answer-dist-csv', {}, page='idashboard')
         return return_csv('answer_dist_{0}.csv'.format(course_id), get_answers_distribution(request, course_id))
 
-    elif "Reset student's attempts" in action:
+    elif "Reset student's attempts" in action or "Delete student state for problem" in action:
         # get the form data
         unique_student_identifier = request.POST.get('unique_student_identifier', '')
         problem_to_reset = request.POST.get('problem_to_reset', '')
@@ -226,6 +226,14 @@ def instructor_dashboard(request, course_id):
             except Exception as e:
                 msg += "<font color='red'>Couldn't find module with that urlname.  </font>"
 
+        if "Delete student state for problem" in action:
+            # delete the state
+            try:
+                module_to_reset.delete()
+                msg += "<font color='red'>Deleted student module state for %s!</font>" % module_state_key
+            except:
+                msg += "Failed to delete module state for %s/%s" % (unique_student_identifier, problem_to_reset)
+        else:
             # modify the problem's state
             try:
                 # load the state json

lms/templates/courseware/instructor_dashboard.html

@@ -149,6 +149,12 @@ function goto( mode)
     <p><input type="text" name="unique_student_identifier">  <input type="submit" name="action" value="Get link to student's progress page"></p>
     <p>and, if you want to reset the number of attempts for a problem, the urlname of that problem</p>
     <p> <input type="text" name="problem_to_reset"> <input type="submit" name="action" value="Reset student's attempts">  </p>
+
+    %if instructor_access:
+    <p> You may also delete the entire state of a student for a problem:
+    <input type="submit" name="action" value="Delete student state for problem">  </p>
+    %endif
+
  %endif
 
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