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[英]Using queryset to 'filter' within form to display results from DB depending on option selected
[英]Show different QuerySet in a ModelMultipleChoice depending in previously selected option in another ModelMultipleChoice
我正在嘗試構建一個簡單的Django webApp,該服務器將文檔存儲在服務器中,並在文檔和項目之間建立關系。
這是我的模型:
class Project(models.Model):
owner = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete='models.CASCADE', related_name='project_members')
project_members = models.ManyToManyField(settings.AUTH_USER_MODEL)
name = models.CharField(max_length=20, blank=False, null=False, unique=True)
def __str__(self):
return str(self.name)
class Document(models.Model):
owner = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.CASCADE)
path = models.FileField(upload_to='documents/')
name = models.CharField(max_length=50)
folders = models.ManyToManyField(Folder)
projects = models.ManyToManyField(Project)
def __str__(self):
return str(self.name)
這是表格的代碼:
class RemoveFileProject(forms.Form):
project_name = forms.ModelMultipleChoiceField(queryset=Project.objects.none())
document_name = forms.ModelMultipleChoiceField(queryset=Document.objects.none(), widget=FilteredSelectMultiple("Documentos", is_stacked=False))
def __init__(self, *args, **kwargs):
user = kwargs.pop('user', None)
super(RemoveFileProject, self).__init__(*args, **kwargs)
if user:
proyectos = Project.objects.filter(project_members=user)
print(proyectos)
self.fields['project_name'] = forms.ModelMultipleChoiceField(queryset=proyectos)
docs = Document.objects.filter(projects=proyectos).select_related()
self.fields['document_name'] = forms.ModelMultipleChoiceField(queryset=docs, widget=FilteredSelectMultiple("Documentos", is_stacked=False))
現在我有兩個問題:
我收到“ ValueError:用於精確查找的QuerySet值必須限制為使用切片的一個結果”。 我知道這是因為proyectos是QuerySet,它們的行為方式獨特,但是我很難掌握如何在Django中進行“ join”。
我只想顯示屬於每個項目的文檔,因此,如果選擇項目“ proyect 1”,則第二個ModelMultipleChoiceFied應該只顯示與“項目1”相關的文檔。
提前致謝
我建議您查看Django Autocomplete Light(DAL)庫,尤其是小部件的forward
屬性( https://django-autocomplete-light.readthedocs.io/en/master/tutorial.html?highlight=forward#filtering-基於表單中其他字段的值的結果 )。 非常適合您的要求!
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