Question

我正在尝试迁移这两个模型：

public abstract class BaseModel : INotifyPropertyChanged
{

    public event PropertyChangedEventHandler PropertyChanged;

    public abstract ModelType ModelType { get; }

    public void OnPropertyChanged([CallerMemberName] string propertyName = "")
    {
        PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
    }
}

public class DisplayModel1 : BaseModel
{
    public string Name { get; set; }

    public override ModelType ModelType => ModelType.Model1;
}

public class DisplayModel2 : BaseModel
{
    public string Name { get; set; }

    public string ExtraText { get; set; }

    public override ModelType ModelType => ModelType.Model2;
}

public class TabModel
{
    private bool isSelected;

    public string Name { get; set; }

    public bool IsSelected
    {
        get { return isSelected; }
        set { isSelected = value; }
    }

    public BaseModel ViewModel { get; set; }
}

//MainViewModel
public class ViewModel
{
    public ObservableCollection<TabModel> TabItems { get; set; }

    public ViewModel()
    {
        TabItems = new ObservableCollection<TabModel>();
        TabItems.Add(new TabModel()
        {
            Name = "Tab1",
            ViewModel = new DisplayModel1() { Name = "ModelOne" },
            IsSelected = true
        });

        TabItems.Add(new TabModel()
        {
            Name = "Tab1",
            ViewModel = new DisplayModel2() { Name = "ModelTwo", ExtraText = "ExtraTwo" },
            IsSelected = false
        });
    }
}

//Decission, which View should be used
public enum ModelType
{
    Model1,
    Model2
}

但是我遇到了这个错误：

from django.db import models
from django.utils import timezone
from django.contrib.auth.models import User
# Create your models here.

# Groups Model
class Cluster(models.Model):

    grp_name = models.CharField(max_length=100)
    grp_status = models.CharField(max_length=100)
    grp_description = models.TextField()
    created_on = models.DateTimeField(default=timezone.now)
    created_by = models.ForeignKey(
        User,
        related_name='created',
        on_delete=models.CASCADE
    )
    updated_on = models.DateTimeField(auto_now=True)
    members = models.ManyToManyField(
        User, 
        through='UserGroup',
        through_fields=('user', 'group'),
        related_name='members'
    )

    def __str__(self):
        return self.grp_name

#user groups
class UserGroup(models.Model):
    user = models.ForeignKey(
        User,
        on_delete=models.CASCADE,
        related_name = 'user'
    )
    group = models.ForeignKey(
        Cluster,
        on_delete=models.CASCADE,
        related_name = 'group'
    )
    date_joined = models.DateTimeField(default=timezone.now)

我想在用户和组之间建立多对多关系。也就是说用户可以处于多个组中，并且组中将有许多用户。为什么我的代码错误？我该如何解决？请帮忙。

Answer 1

User related_name参数：

 created_by=models.ForeignKey(User, on_delete=models.CASCADE,related_name="created")

groups.Groups.created_by ：（字段E303）“ Groups.created_by”的反向查询名称与字段名称“ User.groups”冲突

1 个答案: