EntityFramework 5 - 已经检测到与关系“x”的角色“x”的冲突变化 [英] EntityFramework 5 - Conflicting changes to the role 'x' of the relationship 'x' have been detected

问题描述

我有这个模型（动物模型）：

I have this model (Animal Model):

    public int Id { get; set; }
    public int AnimalSpecieId { get; set; }
    public int AnimalBreedId { get; set; }
    public Nullable<int> ProtectorId { get; set; }
    public Nullable<int> OwnerId { get; set; }
    public string Name { get; set; }
    public virtual Owner Owner { get; set; }
    public virtual Protector Protector { get; set; }

保护者模型：

    public int Id { get; set; }
    public string Name { get; set; }
    public string Address { get; set; }
    public string Phone { get; set; }
    public string CellPhone { get; set; }
    public string Email { get; set; }
    public virtual ICollection<Animal> Animals { get; set; }

所有者型号：

    public int Id { get; set; }
    public string Name { get; set; }
    public string Address { get; set; }
    public string Phone { get; set; }
    public string CellPhone { get; set; }
    public string Email { get; set; }
    public virtual ICollection<Animal> Animals { get; set; }

当我第一次插入这个模型时，如果

When I insert this model at the first time, if

ProtectorID = 1

ProtectorID = 1

和

OwnerID = null

OwnerID = null

没关系，但是，我尝试更新此模型，更改为：

it's ok, but, and I try to update this model, changing to:

OwnerID = 1

OwnerID = 1

和

ProtectorID = null

ProtectorID = null

我得到标题错误，有人可以帮助我吗？

I get the error in title, someone can help me with that ?

推荐答案

我发现问题，读了这个 msdn post ，我在想，发现发生了什么，在我的存储库中，当我更新我的实体时，我忘了设置null l相关实体。

I found the problem, after read this msdn post, I was thinking and found out what was happening, in my repository when I will update my entity, I was forgeting to set null all the related entities.

旧代码：

var oldAnimal = context.Animals.Find(animal.Id);

if (oldAnimal != null)
{
    oldAnimal.AnimalBreed = context.AnimalBreeds.Find(animal.AnimalBreed.Id);
    oldAnimal.AnimalSpecie = context.AnimalSpecies.Find(animal.AnimalSpecie.Id);

    oldAnimal.OwnerId = animal.OwnerId;
    oldAnimal.ProtectorId = animal.ProtectorId;
    oldAnimal.Castrated = animal.Castrated;
    oldAnimal.DateBirth = animal.DateBirth;
    oldAnimal.Gender = animal.Gender;
    oldAnimal.Name = animal.Name;
    oldAnimal.UpdateDate = DateTime.Now;
    oldAnimal.Vaccinated = animal.Vaccinated;
    oldAnimal.Weight = animal.Weight;
}

context.SaveChanges();

return animal;

新代码：

var oldAnimal = context.Animals.Find(animal.Id);

if (oldAnimal != null)
{
    oldAnimal.AnimalBreed = context.AnimalBreeds.Find(animal.AnimalBreed.Id);
    oldAnimal.AnimalSpecie = context.AnimalSpecies.Find(animal.AnimalSpecie.Id);
    oldAnimal.Owner = null;
    oldAnimal.Protector = null;

    oldAnimal.OwnerId = animal.OwnerId;
    oldAnimal.ProtectorId = animal.ProtectorId;
    oldAnimal.Castrated = animal.Castrated;
    oldAnimal.DateBirth = animal.DateBirth;
    oldAnimal.Gender = animal.Gender;
    oldAnimal.Name = animal.Name;
    oldAnimal.UpdateDate = DateTime.Now;
    oldAnimal.Vaccinated = animal.Vaccinated;
    oldAnimal.Weight = animal.Weight;
}

context.SaveChanges();

return animal;

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