class Teacher(db.Model):
id = db.Column(db.Integer, primary_key=True)
first_name = db.Column(db.String(32))
last_name = db.Column(db.String(32))
courses = db.relationship('Course', backref='teacher', lazy=True)
def __repr__(self):
return f'<Teacher {self.id}: {self.first_name} {self.last_name}>'
class Student(db.Model):
id = db.Column(db.Integer, primary_key=True)
first_name = db.Column(db.String(80))
last_name = db.Column(db.String(80))
activity = db.relationship('StudentsActivity', backref='stud', lazy=True)
courses = db.relationship('Course',
secondary=students_courses,
lazy='subquery',
backref=db.backref('students', lazy=True))
def __repr__(self):
return f'<Student {self.id}: {self.first_name} {self.last_name}>'
class Lesson(db.Model):
id = db.Column(db.Integer, primary_key=True)
name = db.Column(db.String(80), nullable=False)
course_id = db.Column(db.Integer, db.ForeignKey('course.id'))
begin_date = db.Column(db.String(16))
end_date = db.Column(db.String(16))
html = db.Column(db.Text)
students_activity = db.relationship('StudentsActivity',
backref='lesson',
lazy=True)
def __repr__(self):
return f'<Lesson {self.id}: {self.name}>'
class Course(db.Model):
id = db.Column(db.Integer, primary_key=True)
name = db.Column(db.String(80), nullable=False)
teacher_id = db.Column(db.Integer, db.ForeignKey('teacher.id'))
lessons = db.relationship('Lesson', backref='course', lazy=True)
def __repr__(self):
return f'<Course {self.id}: {self.name}>'
class StudentsActivity(db.Model):
id = db.Column(db.Integer, primary_key=True)
lesson_id = db.Column(db.Integer, db.ForeignKey('lesson.id'))
last_edited = db.Column(db.String(19))
student = db.Column(db.Integer, db.ForeignKey('student.id'))
data = db.Column(db.Text)
def __repr__(self):
return f'<StudentsActivity {self.id}: student {self.student}, lesson {self.student}>'