added a resolver for fetching a specific node

Author: Ronak-23

backend/family_tree/student/schema.py

@@ -28,6 +28,10 @@ class Query(graphene.ObjectType):
     student_sibling= graphene.List(StudentType, roll=graphene.String())
     student_search= graphene.List(StudentType, search_query=graphene.String())
     student_batch= graphene.List(graphene.List(StudentType), roll=graphene.String())
+    student_node= graphene.Field(StudentType, roll=graphene.String())
+
+    def resolve_student_node(root,info,roll):
+        return Student.objects.get(roll_no=roll)
 
     def resolve_students(root,info):
         return Student.objects.all()

backend/family_tree/student/tests.py

@@ -120,4 +120,17 @@ def test_student_search(self):
         self.assertDictEqual(content['data']['studentSearch'][4], {'id': str(self.student5.id), 'name': self.student5.name})
         self.assertDictEqual(content['data']['studentSearch'][5], {'id': str(self.student6.id), 'name': self.student6.name})
         self.assertDictEqual(content['data']['studentSearch'][6], {'id': str(self.student7.id), 'name': self.student7.name})
-        self.assertDictEqual(content['data']['studentSearch'][7], {'id': str(self.student8.id), 'name': self.student8.name})
+        self.assertDictEqual(content['data']['studentSearch'][7], {'id': str(self.student8.id), 'name': self.student8.name})
+
+    def test_student_node(self):
+        response = self.query('''
+            query {
+                studentNode(roll: "1") {
+                    id
+                    name
+                  }
+                }
+              ''')
+        content= json.loads(response.content)
+        self.assertResponseNoErrors(response)
+        self.assertDictEqual(content['data']['studentNode'], {'id': str(self.student1.id), 'name': self.student1.name})