from django.db import models
from django.db.models import PROTECT


class Subject(models.Model):
    no = models.AutoField(primary_key=True, db_column='sno', verbose_name='编号')
    name = models.CharField(max_length=50, db_column='sname', verbose_name='学科名称')
    intro = models.CharField(max_length=511, db_column='sintro', verbose_name='学科介绍')

    def __str__(self):
        return self.name

    class Meta(object):
        db_table = 'tb_subject'
        verbose_name = '学科'
        verbose_name_plural = '学科'


class Teacher(models.Model):
    no = models.AutoField(primary_key=True, db_column='tno', verbose_name='编号')
    name = models.CharField(max_length=20, db_column='tname', verbose_name='姓名')
    intro = models.CharField(max_length=1023, db_column='tintro', verbose_name='简介')
    motto = models.CharField(max_length=255, db_column='tmotto', verbose_name='教学理念')
    photo = models.CharField(max_length=511, db_column='tphoto', verbose_name='照片', null=True, blank=True)
    subject = models.ForeignKey(Subject, db_column='sno', on_delete=PROTECT, related_name='+', verbose_name='所属学科')
    manager = models.BooleanField(default=False, db_column='tmanager', verbose_name='是否主管')
    good_count = models.IntegerField(default=0, db_column='tgcount', verbose_name='好评数')
    bad_count = models.IntegerField(default=0, db_column='tbcount', verbose_name='差评数')

    class Meta(object):
        db_table = 'tb_teacher'
        verbose_name = '讲师'
        verbose_name_plural = '讲师'
        ordering = ('name', )