Django plurality of fields associated with the same foreign key

Django plurality of fields associated with the same external key
fields.E302,303,304 error

 
from django.db import models
 
 
class ops(models.Model):
    name = models.CharField(max_length=30)
 
 
class shift(models.Model):
    shift_class = models.CharField(max_length=30)
 
 
class ops_shift(models.Model):

    多个字段对应同一个外键的情况下会报错
 
    原因是指向同一模型的三个外键反向关联名称产生了冲突，shift模型对Day1字段的反向关联名称为ops_shift_set()，
    对Day2的反向关联名称也是ops_shift_set()，对Day3的反向关联名称还是ops_shift_set()。
 
    解决方法：给models.ForeignKey()加入related_name参数，定义不同的关联名称。
 
    db_column属性是用来定义在数据库中此字段的名称
    """
    ops_name = models.ForeignKey(ops,db_column='ops_name')
 
    Day1  = models.ForeignKey(shift,related_name='ops_shift_Day1',default='',db_column='Day1')
    Day2  = models.ForeignKey(shift,related_name='ops_shift_Day2',default='',db_column='Day2')
    Day3  = models.ForeignKey(shift,related_name='ops_shift_Day3',default='',db_column='Day3')
    Day4  = models.ForeignKey(shift,related_name='ops_shift_Day4',default='',db_column='Day4')
    Day5  = models.ForeignKey(shift,related_name='ops_shift_Day5',default='',db_column='Day5')
    Day6  = models.ForeignKey(shift,related_name='ops_shift_Day6',default='',db_column='Day6')
    Day7  = models.ForeignKey(shift,related_name='ops_shift_Day7',default='',db_column='Day7')
    Day8  = models.ForeignKey(shift,related_name='ops_shift_Day8',default='',db_column='Day8')
    Day9  = models.ForeignKey(shift,related_name='ops_shift_Day9',default='',db_column='Day9')
    Day10 = models.ForeignKey(shift,related_name='ops_shift_Day10',default='',db_column='Day10')
    Day11 = models.ForeignKey(shift,related_name='ops_shift_Day11',default='',db_column='Day11')
    Day12 = models.ForeignKey(shift,related_name='ops_shift_Day12',default='',db_column='Day12')
    Day13 = models.ForeignKey(shift,related_name='ops_shift_Day13',default='',db_column='Day13')
    Day14 = models.ForeignKey(shift,related_name='ops_shift_Day14',default='',db_column='Day14')
    Day15 = models.ForeignKey(shift,related_name='ops_shift_Day15',default='',db_column='Day15')
    Day16 = models.ForeignKey(shift,related_name='ops_shift_Day16',default='',db_column='Day16')
    Day17 = models.ForeignKey(shift,related_name='ops_shift_Day17',default='',db_column='Day17')
    Day18 = models.ForeignKey(shift,related_name='ops_shift_Day18',default='',db_column='Day18')
    Day19 = models.ForeignKey(shift,related_name='ops_shift_Day19',default='',db_column='Day19')
    Day20 = models.ForeignKey(shift,related_name='ops_shift_Day20',default='',db_column='Day20')
    Day21 = models.ForeignKey(shift,related_name='ops_shift_Day21',default='',db_column='Day21')
    Day22 = models.ForeignKey(shift,related_name='ops_shift_Day22',default='',db_column='Day22')
    Day23 = models.ForeignKey(shift,related_name='ops_shift_Day23',default='',db_column='Day23')
    Day24 = models.ForeignKey(shift,related_name='ops_shift_Day24',default='',db_column='Day24')
    Day25 = models.ForeignKey(shift,related_name='ops_shift_Day25',default='',db_column='Day25')
    Day26 = models.ForeignKey(shift,related_name='ops_shift_Day26',default='',db_column='Day26')
    Day27 = models.ForeignKey(shift,related_name='ops_shift_Day27',default='',db_column='Day27')
    Day28 = models.ForeignKey(shift,related_name='ops_shift_Day28',default='',db_column='Day28')
    Day29 = models.ForeignKey(shift,related_name='ops_shift_Day29',default='',db_column='Day29')
    Day30 = models.ForeignKey(shift,related_name='ops_shift_Day30',default='',db_column='Day30')
    Day31 = models.ForeignKey(shift,related_name='ops_shift_Day31',default='',db_column='Day31')
 
    class Meta:
        """
        在Django的后台可以显示此处定义的中文名称
        """
        verbose_name=u'排班表'
        verbose_name_plural = u"排班表"