Django 多个字段关联同一外键

# -*- coding: utf-8 -*-
"""
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Copyright (C) 2017 THL A29 Limited, a Tencent company. All rights reserved.
Licensed under the MIT License (the "License"); you may not use this file except in compliance with the License.
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Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on
an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and limitations under the License.
"""

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"