[英]Django RelatedManager converts tuple to Unicode string?
To help myself learn Python, I'm writing a simple issue tracker using Django. 为了帮助自己学习Python,我使用Django编写了一个简单的问题跟踪器。
I have two simple classes (left some code out for brevity), Issue
and Version
我有两个简单的类(为简洁起见,省略了一些代码):
Issue
和Version
There is an ISSUE_STATE
tuple that is used to maintain an Issue
's state: 有一个
ISSUE_STATE
元组,用于维护Issue
的状态:
ISSUE_STATE = (
('p', 'In Progress'),
('o', 'Open'),
('r', 'Resolved'),
('c', 'Closed'),
)
It's maintained in the Issue
like so: 它在
Issue
的维护方式如下:
class Issue(models.Model):
state = models.CharField(max_length=1, choices=ISSUE_STATE)
fix_version = models.ForeignKey(Version, related_name='issuesAsFix', null=True, blank=True, default=None)
(As you can also see, a Version
maintains a list of Issue
objects.) (如您所见,
Version
维护一个Issue
对象的列表。)
The problem: 问题:
When I access the state of an individual Issue
instance, it's returned as a tuple. 当我访问单个
Issue
实例的状态时,它将作为元组返回。 When I access the state of an Issue
as provided by a Version
object, it's returned as a Unicode string: 当我访问
Version
对象提供的Issue
的状态时,它以Unicode字符串形式返回:
>>> v = Version()
>>> v.save()
>>> i = Issue()
>>> i.fix_version = v
>>> i.state = ISSUE_STATE[1]
>>> i.save()
>>> i.state
('o', 'Open')
>>> v.issuesAsFix.all()[0].state
u"('o', 'Open')"
>>> i == v.issuesAsFix.all()[0]
True
>>> i is v.issuesAsFix.all()[0]
False
Why is the state
variable of the Issue
a string when accessed as a child property of the Version
? 当作为
Version
的子属性访问时,为什么Issue
的state
变量是字符串?
Thanks in advance! 提前致谢!
>>> i.state = ISSUE_STATE[1]
This line is incorrect. 这行是不正确的。 It should be:
它应该是:
>>> i.state = ISSUE_STATE[1][0]
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