Django的ModelForm中带有DB关系的多选字段

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这是我第一次在Stackoverflow上发帖，所以请忽略错误。在发帖之前，我已经尝试了十几种解决方案，但都没有成功。我在模型中为用户建立了表关系。我需要创建一个ModelForm，让客户从前端为任何项目选择多个用户。我很难在代码中实现它。另外，对于另一个字段，我需要将选择限制在一个用户。以下是代码。

Models:

class Project(models.Model):
   project_name = models.CharField(max_length=100)
   assigned_to = models.ManyToManyField(User)
   project_url = models.URLField()
def __init__(self):
    return str(self.project_name)
Form.
class ProjectForm(forms.ModelForm)
     class Meta:
       fields = ['project_name', 'assigned_to ', 'project_url']
View: 
def projects(request):
   template = 'projects/projects.html'
   if request.method == 'POST':
       form = ProjectForm(request.POST)
       if form.is_valid():
         form.save()
   else:
     form = ProjectForm()
   return render(request, template, {'form': form})
HTML:
<form action='' method='post'>
 {% csrf_token %}
 {{ form }}
 <button type='submit' class='btn btn-primary'>Submit</button>
 </form>
非常感谢您的帮助。


           
            
             
              
               Damini Ganesh
              
              ：


           
            
             
              
               当我遇到这样的情况时，我有一个带复选框的用户列表。在提交时，我有一个post请求，发送用户列表，在views.py中，我从request.POST中获取列表，同时覆盖post方法，然后循环浏览列表，添加用户pk ...类似于```for pk in selected: try: user = User.objects.get(pk=pk) project.project_users.add(user) except User.DoesNotExist: continue ```不知道这是否是你要的方法


           
            
             
              
               Zameer Ahmed
              
              ：


           
            
             
              
               很好的解决方案，但我有一个确切的目标，就是在添加问题时在StackOverFlow选择 "标签"。但对于初学者来说，列表已经足够了，我以后会自己添加自动完成功能。


        
         
          
           
            
            
             Zameer Ahmed
            
           
           
            发布于
            
            2019-07-31


          
           
            
             
              
              
               Mudassar Hashmi
              
             
             
              发布于
              
              2019-08-01


          
           
            
             
              forms.py:
             
             from django import forms
from .models import Project
class ProjectForm(forms.ModelForm):
    def __init__(self, *args, **kwargs):
        assigned_users = kwargs.pop('assigned_to', [])
        super(ProjectForm, self).__init__(*args, **kwargs)
        for field in self.fields.values():
            field.widget.attrs = {"class": "form-control"}
        self.fields['project_name'].required = True
        self.fields['project_url'].required = True
        if assigned_users:
            self.fields['assigned_to'].queryset = assigned_users
        self.fields['assigned_to'].required = True
        self.fields['project_name'].widget.attrs.update({
            'placeholder': 'Project Name'})
        self.fields['project_url'].widget.attrs.update({
            'placeholder': 'Project URL'})
    class Meta:
        model = Project
        fields = ('project_name', 'project_url', 'assigned_to')
views.py
def create_project(request):
    template_name = "create.html"
    users = []
    form = ProjectForm(assigned_to=users)
    if request.method == 'POST':
        form = ProjectForm(request.POST, request.FILES, assigned_to=users)
        if form.is_valid():
            proj_obj = form.save(commit=False)
            proj_obj.created_by = request.user
            proj_obj.save()
            if request.POST.getlist('assigned_to', []):
                proj_obj.assigned_to.add(*request.POST.getlist('assigned_to'))
                assigned_to_list = request.POST.getlist('assigned_to')
            success_url = reverse('projects:list')
            if request.POST.get("savenewform"):
                success_url = reverse("leads:add_lead")
            return JsonResponse({'error': False, 'success_url': success_url})
        return JsonResponse({'error': True, 'errors': form.errors})
    context = {}
    context["proj_form"] = form
    context["users"] = users
    context["assignedto_list"] = [
        int(i) for i in request.POST.getlist('assigned_to', []) if i]
    return render(request, template_name, context)
创建.html。
<div class="form-control">
    {{ proj_form.project_name }}