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我有表从django模型中的manytomany字段获取值?
class Book(models.Model):
title = models.CharField(max_length=200)
authors = models.ManyToManyField(Individual, related_name="author_for", blank=True, null=True)
illustrators = models.ManyToManyField(Individual, related_name="illustrator_for", blank=True, null=True)
class Unitary_Sale(models.Model):
book = models.ForeignKey(Book)
quantity = models.IntegerField()
unit_price = models.DecimalField(max_digits=15, decimal_places=3)
sale = models.ForeignKey(Sale)
如何报告书已被作者或插画出售?
by_author = {}
for unit_sale in Unitary_sale.objects.all():
author = unit_sale.book.authors
by_authors[author] = (unit_sale.quantity, unit_sale.quantity *unit_sale.unit_price)
Author Qty Amount($)
A 2 20
A&B 3 30
***一本书有许多作者
那么,你到目前为止有什么,它怎么不工作? – 2010-01-17 06:31:59