from django.db import models
# Модель Предметов
class Subject(models.Model):
  subject_name = models.CharField("Название предмета:", max_length=100)
  LEVEL_CHOICES = ( 
    ("1", "1"),
    ("2", "2"), 
    ("3", "3"), 
) 
  level = models.CharField( 
    "Уровень предмета:",
        max_length = 20, 
        choices = LEVEL_CHOICES, 
        default = '1'
        )
  def __str__(self):
    return self.subject_name
  class Meta:
    verbose_name = "Предмет"
    verbose_name_plural = "Предметы"
# Модель Вопросов
class Question(models.Model):
  subject_id = models.ForeignKey(Subject, verbose_name='Предмет', on_delete=models.CASCADE)
  question = models.TextField("Вопрос")
  def __str__(self):
    return self.question
  class Meta:
    verbose_name = "Вопрос"
    verbose_name_plural = "Вопросы"
# Модель Ответов
class Answer(models.Model):
  question_id = models.ForeignKey(Question, verbose_name='Вопрос', on_delete=models.CASCADE)
  answer = models.TextField("Ответ")
  correct_answer = ( 
    ("0", "Нет"),
    ("1", "Да"),
) 
  level = models.CharField( 
    "Правильный ответ:",
        max_length = 1, 
        choices = correct_answer, 
        default = '0'
        )
  def __str__(self):
    return self.answer
  class Meta:
    verbose_name = "Ответ"
    verbose_name_plural = "Ответы"

 from django.contrib import admin
from .models import Subject, Question, Answer
admin.site.register(Subject)
admin.site.register(Question)
admin.site.register(Answer)