Question

我有挑战删除和更新多对多表，下面是模型和代码

class Job(Model):
    """docstring for Jobs"""
    url = CharField(max_length=200, unique=True)
    title = TextField()
    description = TextField()
    sponsor = CharField(max_length=100)
    location = CharField(max_length=100)
    uuid = CharField(max_length=150)
    timestamp = DateTimeField(default=datetime.datetime.now)

    class Meta:
        database = DATABASE
        order_by = ('-timestamp',)

class Category(Model):
    """docstring for JobCategory"""
    category = CharField(max_length=100, unique=True)
    cat_slug = TextField()
    jobs = ManyToManyField(Job, related_name='categories')
    class Meta:
        database = DATABASE
JobsCategory = Category.jobs.get_through_model()

以下是删除查询的方法，实际上它有效，但只删除一行，如何删除多行

def updateEntries(self):
      try:
            query = models.Job.select().where(models.Job.timestamp < datetime.date.today()-datetime.timedelta(days=2)):
            return jobs.execute()  # Returns the number of rows deleted. delete_instance()
        except models.DoesNotExist:
            pass

Answer 1

那么，http://docs.peewee-orm.com/en/latest/peewee/playhouse.html#ManyToManyField.remove

但你也可以这样做：

JobsCategory.delete().where(
    (JobsCategory.job == job_obj) &
    (JobsCategory.category == category_obj)).execute()

删除/更新多对多表

1 个答案: