Django管理界面：对带有中间表的ManyToMany字段使用horizo​​ntal_filter

Django管理界面：对带有中间表的ManyToMany字段使用horizo​​ntal_filter

我可以找到解决此问题的方法。这个想法是：

1. 当且仅当它们是新的时，才在Membership表中创建新条目（否则将删除Membership表中其他字段的现有数据）
2. 删除从“成员资格”表中取消选择的条目

为此，我替换了：

if project.pk:    project.userprofile_set = self.cleaned_data['userprofiles']    self.save_m2m()

通过：

if project.pk:    # Get the existing relationships    current_project_selections = Membership.objects.filter(project=project)    current_selections = [o.userprofile for o in current_project_selections]    # Get the submitted relationships    submitted_selections = self.cleaned_data['userprofiles']    # Create new relation in Membership table if they do not exist    for userprofile in submitted_selections :        if userprofile not in current_selections: Membership(project=project,userprofile=userprofile).save()    # Remove the relations that were deselected from the Membership table    for project_userprofile in current_project_selections:        if project_userprofile.userprofile not in submitted_selections : project_userprofile.delete()