Use django Q objects instead of raw SQL query

circle.yml

@@ -11,7 +11,7 @@ dependencies:
     - "pip install -r requirements.txt"
     - "pip install -r $VIRTUAL_ENV/src/xblock-sdk/requirements/base.txt"
     - "pip install -r $VIRTUAL_ENV/src/xblock-sdk/requirements/test.txt"
-    - "pip uninstall -y xblock-problem-builder && python setup.py sdist && pip install dist/xblock-problem-builder-2.6.4.tar.gz"
+    - "pip uninstall -y xblock-problem-builder && python setup.py sdist && pip install dist/xblock-problem-builder-2.6.5.tar.gz"
     - "pip install -r test_requirements.txt"
     - "mkdir var"
 test:

problem_builder/answer.py

@@ -25,6 +25,7 @@
 
 from django.core.exceptions import ValidationError
 from django.db import IntegrityError
+from django.db.models import Q
 from django.utils.crypto import get_random_string
 
 from .models import Answer
@@ -70,16 +71,11 @@ def _get_student_id(self):
 
     @staticmethod
     def _fetch_model_object(name, student_id, course_id):
-        sql_query = '''SELECT * FROM problem_builder_answer
-                         WHERE name = %s
-                           AND student_id = %s
-                           AND (course_key = %s
-                                OR course_id = %s)'''
-        params = [name, student_id, course_id, course_id]
-        try:
-            answer = Answer.objects.raw(sql_query, params)[0]
-        except IndexError:
-            raise Answer.DoesNotExist()
+        answer = Answer.objects.get(
+            Q(name=name),
+            Q(student_id=student_id),
+            Q(course_key=course_id) | Q(course_id=course_id)
+        )
         if not answer.course_key:
             answer.course_key = answer.course_id
         return answer

setup.py

@@ -71,7 +71,7 @@ def package_data(pkg, root_list):
 
 setup(
     name='xblock-problem-builder',
-    version='2.6.4',
+    version='2.6.5',
     description='XBlock - Problem Builder',
     packages=['problem_builder', 'problem_builder.v1'],
     install_requires=[