在django中如何设置ManyToMany字段的初始值？ [英] How do you set the initial value for a ManyToMany field in django?

问题描述

我正在使用一个ModelForm来创建一个表单，并且我已经获得了窗体中除了一个ManyToMany字段之外的每个字段设置的初始值。

我明白，我需要给它一个列表，但我不能让它工作。我现在的代码是：

  userProfile = request.user.get_profile（）
雇主= userProfile。雇主
 bar_memberships = userProfile.barmembership.all（）
 profileForm = ProfileForm（
 initial = {'雇主'：雇主，'barmembership'：bar_memberships}）
  

但这不行。我在这里缺少一些东西吗？

每个请求在评论中，以下是我的模型的相关部分：

 ＃一个持有和处理酒吧会员资格的课程。 
 class BarMembership（models.Model）：
 barMembershipUUID = models.AutoField（每个条形成员的唯一ID，
 primary_key = True）
 barMembership = USStateField（ 
 
 def __unicode __（self）：
 return self.get_barMembership_display（）
 
 class Meta：
 verbose_name =bar membership
 db_table =BarMembership
 ordering = [barMembership] 
  

正在扩展的用户个人资料：

 ＃使用我们需要的字段扩展User类的类。 
 class UserProfile（models.Model）：
 userProfileUUID = models.AutoField（每个用户配置文件的唯一ID，
 primary_key = True）
 user = models.ForeignKey用户
 verbose_name =该模型扩展的用户，
 unique = True）
雇主= models.CharField（用户的雇主，
 max_length = 100，
 blank = True）
 barmembership = models.ManyToManyField（BarMembership，
 verbose_name =用户持有的酒吧会员资格，
 blank = True，
 null = True） 
  

希望这有帮助。

解决方案

好的，我终于明白了。好主，有时解决方案太容易了。

我需要做：

  profileForm = ProfileForm = userProfile）
  

我做了这个改变，现在一切正常。

I am using a ModelForm to create a form, and I have gotten the initial values set for every field in the form except for the one that is a ManyToMany field.

I understand that I need to give it a list, but I can't get it to work. My code in my view right now is:

        userProfile = request.user.get_profile()
        employer = userProfile.employer
        bar_memberships = userProfile.barmembership.all()
        profileForm = ProfileForm(
            initial = {'employer': employer, 'barmembership' : bar_memberships})

But that doesn't work. Am I missing something here?

Per request in the comments, here's the relevant parts of my model:

# a class where bar memberships are held and handled.
class BarMembership(models.Model):
    barMembershipUUID = models.AutoField("a unique ID for each bar membership",
        primary_key=True)
    barMembership = USStateField("the two letter state abbreviation of a bar membership")

    def __unicode__(self):
        return self.get_barMembership_display()

    class Meta:
        verbose_name = "bar membership"
        db_table = "BarMembership"
        ordering = ["barMembership"]

And the user profile that's being extended:

# a class to extend the User class with the fields we need.
class UserProfile(models.Model):
    userProfileUUID = models.AutoField("a unique ID for each user profile",
        primary_key=True)
    user = models.ForeignKey(User,
        verbose_name="the user this model extends",
        unique=True)
    employer = models.CharField("the user's employer",
        max_length=100,
        blank=True)
    barmembership = models.ManyToManyField(BarMembership,
        verbose_name="the bar memberships held by the user",
        blank=True,
        null=True)

Hope this helps.

解决方案

OK, I finally figured this out. Good lord, sometimes the solutions are way too easy.

I need to be doing:

profileForm = ProfileForm(instance = userProfile)

I made that change, and now everything works.

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