使选择形式动态 [英] Making CHOICES in forms dynamic

问题描述

我已经被卡住了一段时间，试图使用python 2.7在表单选择中设置动态CHIOCES。我需要选择来自我的 def update_file_choices 中的查询。以下是views.py中的代码：

I have been stuck for a while trying to set a dynamic CHIOCES in form selection using python 2.7. I need the CHOICES to come from the query in my def update_file_choices. Here is the code in views.py:

FILES_UPLOADED=[]           ##choices varible for template

def update_file_choices():  ##setup choices for RoomForm in launch page
    global FILES_UPLOADED
    uploads = FileUpload.objects.all()  
    for file in uploads:
        FILES_UPLOADED.append((file.title,file.title))
        print 'FILES IN UPLOADS:', file
    return(FILES_UPLOADED)

1。以下课程的表单工作，但不显示上传本课程的新文件的标题。

1. Forms from the following class work except they doesn't show titles of new files uploaded this session.

class RoomForm(forms.Form):    ##for launch template
    FILES_UPLOADED = update_file_choices()
    titles = forms.ChoiceField(choices=FILES_UPLOADED) 

2。所以我改为这个版本，调用基类，但现在表单设置没有任何变量数据。

2. So I changed to this version, calling the base class, but now the form sets up without any variable data.

class RoomForm(forms.Form):      
    def __init__(self, *args):
        forms.Form.__init__(self, RoomForm)
        FILES_UPLOADED = update_file_choices()
        titles = forms.ChoiceField(choices=FILES_UPLOADED) 

3。这有同样的问题：

3. This had the same problem:

class RoomForm(forms.Form):
    def __init__(self, *args, **kwargs):
        super(RoomForm, self).__init__(*args, **kwargs)
        FILES_UPLOADED = update_file_choices()
        titles = forms.ChoiceField(choices=FILES_UPLOADED) 

任何建议都将不胜感激。

Any suggestions would be much appreciated.

推荐答案

如果您的选择直接来自一个queryset（ FileUpload ）的查询，那么为什么不使用为此设计的表单字段： ModelChoiceField ？

If your choices are coming directly from a queryset (of FileUpload), why don't you use the form field that is designed for that: ModelChoiceField?

titles = forms.ModelChoiceField(queryset=FileUpload.objects.all())

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