使用查询集生成Django中IntegerField上的选择小部件的选项 [英] using a queryset to generate options for select widget on IntegerField in Django

问题描述

我正在尝试建立一个用户可以在其中拥有多个化身的网站，并选择他们要在进入房间时使用的化身。 （这将是一个掷骰子的应用程序。）我被困了三天，试图弄清楚如何将查询集传递到表单中，以用作IntegerField上选择小部件的选项。现在，我想我已经成功地将信息传递到了表单中，但是小部件中没有呈现任何内容。 （我什至有一份书面声明，向我自己证明信息已经进入。）

model.py

  class EnterSWroom（models.Model）：
 room_number = models.IntegerField（blank = False）
 passcode = models.CharField（ max_length = 100，blank = True，null = True）
 default_avatar = models.IntegerField（默认= 0）
  

forms.py

  class Enter_SW_Room（forms.ModelForm）：
类Meta：
模型= EnterSWroom 
小部件= {'default_avatar'：forms.Select（choices = []）} 
字段=（'room_number'，'passcode'，'default_avatar'）
 
 def __init __（自身，* args，** kwargs）：
 import_list = kwargs.pop（'avatar_list'）
 super（）.__ init __（* args，** kwargs）
 self.fields ['default_avatar']。choices = imported_list 
 print（self.fields ['default_avatar']。choices）＃这仅用于调试；请参见下面的示例
  

views.py

  class DockingBay（FormMixin，TemplateView）：
 form_class = Enter_SW_Room 
 
 def get_form_kwargs（self）：
 kwargs = super（）。get_form_kwargs（ ）
＃获取化身选择的元组
＃获取用户名（如果存在），如果self.request.user.userprofile.user_first_name则使用用户名
：
 user_name = self .request.user.userprofile.user_first_name 
其他：
 user_name = self.request.user.username 
＃实例化头像列表，从用户名
开始my_avatars = Avatar.objects。 filter（user_id = self.request.user.id）
 my_avatars_choices = [（0，user_name）] 
 for my_avatars中的头像：
如果avatar.deleted！= 1：
 my_avatars_choices.append（（avatar.id，avatar.avatar_name））
 kwargs ['avatar_list'] = my_avatars_choices 
 return kwargs 
 
 def get（self，request，* args，** kwargs）：
 kwargs = self.get_form_kwargs（）
＃为简洁而削减
 form = Enter_SW_Room（** kwargs）
 args = {'form'：form，＃从该示例中删除的其他args} 
 
返回render（request，self.template_name，args）
 ... 
  

打印示例： [（0，' Eric']]
但是，即使打印显示我已成功将查询集获取到表单，选择小部件也不显示任何内容。

预先感谢！

编辑以添加html模板的代码段：

 < form method = post> 
 {％csrf_token％} 
< table> 
< col width = 240> 
< col width = 120> 
< tr> 
< td>< strong>房间ID：< / strong> 
< br>这将是一个数字。 
< td> {{form.room_number}}< br> 
< strong> {{form.room_number.errors}}< / strong> 
< / td> 
< / tr> 
< tr> 
< td>< strong>密码：< / strong> 
< br>如果房间是空的，或者您曾经去过房间，请将此空白留空。< / td> 
< td> {{form.passcode}}< br> 
< strong> {{form.passcode.errors}}< / strong> 
< / td> 
< / tr> 
< tr> 
< td>< strong>头像：< / strong> 
< br>选择您的头像。< / td> 
< td> {{form.default_avatar}}< br> 
< strong> {{form.default_avatar.errors}}< / strong> 
< / td> 
< / tr> 
< / table> 
< button type = submit>进入房间< / button> 
< / form> 
  

解决方案

哦，我是个白痴。忘记定义表单中的字段。

已添加：

  default_avatar = form.ChoiceField（）
  

到表单。现在可以了。

I'm trying to make a site where users can have multiple avatars and pick the one they want to use when entering a room. (It will be a dice-rolling app.) I've been stuck for three days trying to figure out how to pass a queryset into a form to use as the options for a select widget that's on an IntegerField. Right now, I think I have successfully passed the information into the form, but nothing is rendering in the widget. (I've even got a print statement in the form to prove to myself that the information has made its way in.)

model.py

class EnterSWroom(models.Model):
    room_number = models.IntegerField(blank=False)
    passcode = models.CharField(max_length=100, blank=True, null=True)
    default_avatar = models.IntegerField(default=0)

forms.py

class Enter_SW_Room(forms.ModelForm):
    class Meta:
        model = EnterSWroom
        widgets = {'default_avatar': forms.Select(choices=[])}
        fields = ('room_number', 'passcode', 'default_avatar')

    def __init__(self, *args, **kwargs):
        imported_list = kwargs.pop('avatar_list')
        super().__init__(*args, **kwargs)
        self.fields['default_avatar'].choices = imported_list
        print(self.fields['default_avatar'].choices)  #this is just for debugging; see example below

views.py

class DockingBay(FormMixin, TemplateView):
    form_class = Enter_SW_Room

    def get_form_kwargs(self):
        kwargs = super().get_form_kwargs()
        # get tuples for avatar choices
        # get user first name (if exists), else use username
        if self.request.user.userprofile.user_first_name:
            user_name = self.request.user.userprofile.user_first_name
        else:
            user_name = self.request.user.username
        # instantiate avatars list, start with user name
        my_avatars = Avatar.objects.filter(user_id=self.request.user.id)
        my_avatars_choices = [(0, user_name)]
        for avatar in my_avatars:
            if avatar.deleted != 1:
                my_avatars_choices.append((avatar.id, avatar.avatar_name))
        kwargs['avatar_list'] = my_avatars_choices
        return kwargs

    def get(self, request, *args, **kwargs):
        kwargs = self.get_form_kwargs()
        # cut for brevity
        form = Enter_SW_Room(**kwargs)
        args = {'form': form, # other args that were cut from this example}

        return render(request, self.template_name, args)
...

Example of a print: [(0, 'Eric')] But, even though the print suggests that I've successfully gotten the queryset to the form, the selection widget displays nothing.

Thanks in advance!

edit to add snippet of html template:

<form method="post">
    {% csrf_token %}
    <table>
        <col width="240">
        <col width="120">
        <tr>
            <td><strong>Room ID:</strong>
            <br>This will be a number.</td>
            <td>{{form.room_number}} <br>
                <strong>{{ form.room_number.errors }}</strong>
            </td>
        </tr>
        <tr>
            <td><strong>Passcode:</strong>
            <br>If the room is open, or you've been in it before, leave this  blank.</td>
            <td>{{form.passcode}} <br>
                <strong>{{ form.passcode.errors }}</strong>
            </td>
        </tr>
        <tr>
            <td><strong>Avatar:</strong>
            <br>Select your avatar.</td>
            <td>{{form.default_avatar}} <br>
                <strong>{{ form.default_avatar.errors }}</strong>
            </td>
        </tr>
    </table>
    <button type="submit">Enter Room</button>
</form>

解决方案

Oh, I'm an idiot. Forgot to define the field in the form.

added:

default_avatar = forms.ChoiceField()

to the form. Now it works. Arrrrrgh!

这篇关于使用查询集生成Django中IntegerField上的选择小部件的选项的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！