DB关系的Django中的Modelform中的Multichoicefield

Question

这是我在Stackoverflow上的第一篇文章，因此请忽略错误。在发布之前，我尝试了十几个解决方案，无效。我在用于用户的模型中有表关系。我需要创建一个Modelform，以让客户从前端选择任何项目的多个用户。我很难用代码实现它。同样对于另一个字段，我需要将选择限制在一个用户中。以下是代码。

模型：

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)

形式。

class ProjectForm(forms.ModelForm)
     class Meta:
       fields = ['project_name', 'assigned_to ', 'project_url']

查看：

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>

一些帮助得到高度赞赏。

Answer 1

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)

create.html：

<div class="form-control">
    {{ proj_form.project_name }}
    {{ proj_form.assigned_to }}
    {{ proj_form.project_url }}
</div>