Trecho do Modelo de Domínio do módulo Escola que trata da Grade curricular do Curso

models-grade.py

class Area(models.Model):
    nomecurso = models.CharField(max_length=255)
    instituicao = models.CharField(max_length=255)
    # __unicode__ on Python 2
	def __str__(self):
		return self.nome
		
class Disciplina(models.Model):
    nome = models.CharField(max_length=255)
    cargahoraria = models.IntegerField()
    serie = models.ForeignKey(Serie, on_delete=models.CASCADE)
    # __unicode__ on Python 2
	def __str__(self):
		return self.nome +" - Carga Horária:"+ self.cargahoraria +"h " + str(self.serie)


class Professor(Funcionario):
    area = models.ForeignKey(Area, on_delete=models.CASCADE)
    # __unicode__ on Python 2
    def __str__(self):
        return self.serie.nome
    class Meta(Funcionario.Meta):
        pass

class ProfessorTurma(models.Model):
    professor = models.ForeignKey(Professor, on_delete=models.CASCADE)
    turma = models.ForeignKey(Turma, on_delete=models.CASCADE)
    disciplina = models.ForeignKey(Disciplina, on_delete=models.CASCADE)
    # __unicode__ on Python 2
	def __str__(self):
		return str(self.turma) + str(self.disciplina) + str(self.professor)