merged

ARFA/ARFA_app/migrations/0004_auto_20181125_1807.py

+# -*- coding: utf-8 -*-
+# Generated by Django 1.11.16 on 2018-11-25 18:07
+from __future__ import unicode_literals
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('ARFA_app', '0003_auto_20181125_1102'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='question',
+            name='num_appeared',
+            field=models.IntegerField(default=0),
+        ),
+        migrations.AddField(
+            model_name='question',
+            name='num_correct',
+            field=models.IntegerField(default=0),
+        ),
+        migrations.AlterField(
+            model_name='test',
+            name='max_marks',
+            field=models.IntegerField(null=True),
+        ),
+    ]

ARFA/ARFA_app/models.py

@@ -86,7 +86,7 @@ class Question(models.Model):
 	difficulty_observed = models.CharField(max_length=20)
 	question_text = models.CharField(max_length=1000)
 	image_link = models.CharField(max_length=200)
-	num_appeared = models.IntegerField(default = 0)
+	num_appeared = models.IntegerField(default=0)	
 	num_correct = models.IntegerField(default=0)
 	visibility = models.CharField(max_length=20)
 	ownership = models.CharField(max_length=20)

ARFA/ARFA_app/utilities.py

@@ -9,6 +9,7 @@ from .models import Question
 from .models import Options
 from .models import Student
 from .models import Evaluation
+from .models import Takes
 
 from django.contrib.auth.decorators import login_required
 from django.http import HttpResponse
@@ -16,25 +17,45 @@ from django.views.decorators.cache import cache_control
 import json
 from django.db import connection
 from django.db import IntegrityError
+from django.db.models import F
+from pprint import pprint
+import datetime
 
 def evaluate(responses, otherData):
+    """responses contains a list of dicts of the form {q_ID: [option1, option2 ..]}
+    other data contains any other data necessary for evaluation such as testID and studentID"""
+
     #create evaluation object
     evalObj = Evaluation()
     if len(responses) == 0:
         return
 
-    # attemptObj = Attempt()
-    # attempt.student = Student.objects.get(username=request.session['username'])
-    # attemptObj.test = responses[0].test_ID
-    # attemptObj.save()
-    evalObj.student_id = otherData['username']
-    evalObj.test_ID_id = int(otherData['testID'])
+    #debugging:
+    print "responses:"
+    print responses
 
+    #marks for each question:
+    #list of question ids
+    print "QList"
+    QList = [int(question) for [(question, _)] in [response.items() for response in responses]]
+    print QList
 
-    # evalObj.attempt = attemptObj
-    evalObj.q_ID = None
+    #select contains objects for which test_ID=tetsID, q_ID belongs to list QList
+    contains = models.Contains.objects.filter(test_ID=otherData['testID'], q_ID__in=QList)
+
+    #put these in a dictionary {q_ID:[marks_pos, marks_neg]}
+    marksDict = {}
+    for c in contains:
+        marksDict[c.q_ID_id] = [c.marks_pos, c.marks_neg]
+
+    totalMarks = 0
+    correctQList = [] #list of correctly attempted questions
     correctAnswer = None
     for response in responses:
+        evalObj = Evaluation()
+        evalObj.student_id = otherData['username']
+        evalObj.test_ID_id = int(otherData['testID'])
+        evalObj.q_ID = None
         (question, options), = response.items()
         question = int(question)
         # options = responses[question]
@@ -49,24 +70,42 @@ def evaluate(responses, otherData):
         #     evalObj.marks = 1
 
         responseList = options
-        # print "correctanswer"
-        # print correctAnswer
-        # print correctAnswer.values('pk')
-        # correctAnswer = list(correctAnswer.values('pk'))
-        # correctAnswer = list(map(lambda x: x['pk'], correctAnswer))
         print correctAnswer
+        
         if len(responseList) == len(correctAnswer) and sorted(responseList) == sorted(correctAnswer):
-            evalObj.marks = 1
-        # print "responses"
-        # print responseList
-        # print correctAnswer
-        # print evalObj
+            evalObj.marks = marksDict[question][0] #0 - first in the list, marks_pos
+            totalMarks = totalMarks + evalObj.marks
+            correctQList.append(question) #add to list of correctly attempted questions
+        #else, it is a wrong answer since no attempt results in no response
+        else:
+            evalObj.marks = marksDict[question][1] #1 - second in the list, marks_neg
+            totalMarks = totalMarks + evalObj.marks
+        
         try:
             evalObj.save()
         except IntegrityError as e:
             print "Integrity error - evaluation not recorded"
             pass
 
+    #update questions' data
+    #https://docs.djangoproject.com/en/2.1/topics/db/queries/#updating-multiple-objects-at-once
+    models.Question.objects.filter(q_ID__in=QList).update(
+        num_appeared = F('num_appeared')+1)
+    models.Question.objects.filter(q_ID__in=correctQList).update(
+        num_correct = F('num_correct')+1)
+
+    #write takesObj
+    takesObj = Takes()
+    takesObj.student_id = otherData['username']
+    takesObj.test_ID_id = otherData['testID']
+    takesObj.time_stamp = datetime.datetime.now()
+    takesObj.total_marks = totalMarks
+    try:
+        takesObj.save()
+    except IntegrityError as e:
+        print "Integrity error in Takes - not recorded"
+        pass
+
 def getOptions(question):   #returns queryset
     return models.Options.objects.get(q_ID = question)