Shivam Fixing Backend Issues

README.md

@@ -30,6 +30,7 @@ You will hear back within 48 hours from us via email.
 
 ### Install requirements
 
+virtualenv env --python=python3.8
 ```
 virtualenv env --python=python3.8
 source env/bin/activate

core/apis/assignments/__init__.py

@@ -1,2 +1,3 @@
 from .student import student_assignments_resources
 from .teacher import teacher_assignments_resources
+from .principal import principal_assignments_resources

core/apis/assignments/principal.py

@@ -0,0 +1,41 @@
+from flask import Blueprint, jsonify, request
+from core import db
+from core.apis import decorators
+from core.apis.responses import APIResponse
+from core.models.assignments import Assignment, AssignmentStateEnum, GradeEnum
+from .schema import AssignmentSchema, AssignmentGradeSchema  # Import your schema
+from core.libs import assertions
+
+principal_assignments_resources = Blueprint('principal_assignments_resources', __name__)
+
+@principal_assignments_resources.route('/assignments', methods=['GET'], strict_slashes=False)
+@decorators.authenticate_principal
+def list_assignments(p):
+    """Returns a list of all submitted and graded assignments."""
+    assignments = Assignment.get_assignments_by_principal()
+    assignments_dump = AssignmentSchema().dump(assignments, many=True)
+    return APIResponse.respond(data=assignments_dump)
+
+@principal_assignments_resources.route('/assignments/grade', methods=['POST'], strict_slashes=False)
+@decorators.accept_payload
+@decorators.authenticate_principal
+def grade_assignment(p, incoming_payload):
+    """Grade an assignment"""
+    grade_assignment_payload = AssignmentGradeSchema().load(incoming_payload)
+
+    assignment = Assignment.get_by_id(grade_assignment_payload.id)
+    assertions.assert_found(assignment, 'No assignment with this id was found')
+
+    if assignment.state == AssignmentStateEnum.DRAFT:
+        return APIResponse.respond(
+            message='Assignment in draft state cannot be graded',
+            status_code=400
+        )
+
+    assignment.grade = GradeEnum(grade_assignment_payload.grade)
+    assignment.state = AssignmentStateEnum.GRADED
+    db.session.commit()
+
+    assignment_dump = AssignmentSchema().dump(assignment)
+    return APIResponse.respond(data=assignment_dump)
+

core/apis/responses.py

@@ -3,5 +3,8 @@
 
 class APIResponse(Response):
     @classmethod
-    def respond(cls, data):
-        return make_response(jsonify(data=data))
+    def respond(cls, data=None, status_code=200, message=None):
+        response_data = {'data': data}
+        if message:
+            response_data['message'] = message
+        return make_response(jsonify(response_data), status_code)

core/models/assignments.py

@@ -5,6 +5,7 @@
 from core.models.teachers import Teacher
 from core.models.students import Student
 from sqlalchemy.types import Enum as BaseEnum
+from sqlalchemy import or_
 
 
 class GradeEnum(str, enum.Enum):
@@ -91,3 +92,12 @@ def get_assignments_by_student(cls, student_id):
     @classmethod
     def get_assignments_by_teacher(cls):
         return cls.query.all()
+
+    @classmethod
+    def get_assignments_by_principal(cls):
+        return cls.filter(
+            or_(
+                cls.state == AssignmentStateEnum.SUBMITTED,
+                cls.state == AssignmentStateEnum.GRADED
+            )
+        ).all()

core/server.py

@@ -1,7 +1,11 @@
 from flask import jsonify
 from marshmallow.exceptions import ValidationError
 from core import app
-from core.apis.assignments import student_assignments_resources, teacher_assignments_resources
+from core.apis.assignments import (
+    student_assignments_resources,
+    teacher_assignments_resources,
+    principal_assignments_resources
+)
 from core.libs import helpers
 from core.libs.exceptions import FyleError
 from werkzeug.exceptions import HTTPException
@@ -10,6 +14,7 @@
 
 app.register_blueprint(student_assignments_resources, url_prefix='/student')
 app.register_blueprint(teacher_assignments_resources, url_prefix='/teacher')
+app.register_blueprint(principal_assignments_resources, url_prefix='/principal')
 
 
 @app.route('/')

tests/SQL/count_grade_A_assignments_by_teacher_with_max_grading.sql

@@ -1 +1,26 @@
 -- Write query to find the number of grade A's given by the teacher who has graded the most assignments
+WITH TeacherGradingCount AS (
+    SELECT 
+        teacher_id, 
+        COUNT(*) AS total_assignments
+    FROM 
+        assignments
+    GROUP BY 
+        teacher_id
+),
+MaxGradingTeacher AS (
+    SELECT 
+        teacher_id
+    FROM 
+        TeacherGradingCount
+    ORDER BY 
+        total_assignments DESC
+    LIMIT 1
+)
+SELECT 
+    COUNT(*) AS grade_A_count
+FROM 
+    assignments
+WHERE 
+    grade = 'A'
+    AND teacher_id = (SELECT teacher_id FROM MaxGradingTeacher);