Adding source code files for Chapter 10

Chapter10/restapi/api_app.py

@@ -0,0 +1,80 @@
+#api_app: REST API for student resource
+from flask_sqlalchemy import SQLAlchemy
+from flask import Flask
+from flask_restful import Resource, Api, reqparse
+
+app = Flask(__name__)
+api = Api(app)
+
+app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:///student.db'
+app.config['SQLALCHEMY_TRACK_MODIFICATIONS'] = False
+db = SQLAlchemy(app)
+
+parser = reqparse.RequestParser()
+parser.add_argument('name', type=str)
+parser.add_argument('grade', type=str)
+
+class Student(db.Model):
+    id = db.Column(db.Integer, primary_key=True)
+    name = db.Column(db.String(80), nullable=False)
+    grade = db.Column(db.String(20), nullable=True)
+
+    def __repr__(self):
+        return f"{'id':{self.id}, 'name':{self.name},'grade':{self.grade}}"
+
+    def serialize(self):
+        return {
+            'id': self.id,
+            'name': self.name,
+            'grade': self.grade
+        }
+
+class StudentDao(Resource):
+    def get(self, student_id):
+        student = Student.query.filter_by(id=student_id).\
+            first_or_404(description='Record with id={} is not available'.format(student_id))
+        return student.serialize()
+
+    def delete(self, student_id):
+        student = Student.query.filter_by(id=student_id).\
+            first_or_404(description='Record with id={} is not available'.format(student_id))
+        db.session.delete(student)
+        db.session.commit()
+        return '', 204
+
+    def put(self, student_id):
+        student = Student.query.filter_by(id=student_id).first_or_404\
+            (description='Record with id={} is not available'.format(student_id))
+        args = parser.parse_args()
+        name = args['name']
+        grade = args['grade']
+        if (name):
+            student.name = name
+        if (grade):
+            student.grade = grade
+        db.session.commit()
+        return student.serialize(), 200
+
+class StudentListDao(Resource):
+    def get(self):
+        students = Student.query.all()
+        return [Student.serialize(student) for student in students]
+
+    def post(self):
+        args = parser.parse_args()
+        name = args['name']
+        grade = args['grade']
+        student = Student(name=name, grade=grade)
+        db.session.add(student)
+        db.session.commit()
+        return student.serialize(), 200
+
+api.add_resource(StudentDao, '/students/<student_id>')
+api.add_resource(StudentListDao, '/students')
+
+
+if __name__ == '__main__':
+    #app.run(debug=True)
+    app.run(debug=True, host='0.0.0.0', port=8080)
+
+