Question

我正在尝试保存具有OneToMany关系的模型。当我在Cascade.All()映射中添加HasMany时，如果父级有子级，则在保存父级时遇到错误。我的错误： Batch update returned unexpected row count from update; actual row count: 0; expected: 1;

我的模型：

public class BaseModel
{
    public virtual Guid Id { get; set; }
}

public class NamedModel : BaseModel
{
    public virtual string Name { get; set; }
}

public class Ingredient : NamedModel
{
    public virtual int Amount { get; set; }
    public virtual Recipe Recipe { get; set; }
}

public class Recipe : NamedModel
{
    public virtual IList<Ingredient> Ingredients { get; set; }
}

我的映射：

public BaseMapping<TModel> : ClassMap<TModel> where TModel : BaseModel
{
    public BaseMapping()
    {
        Id(x => x.Id).GeneratedBy.Guid();
    }
}

public IngredientMapping : BaseMapping<Ingredient>
{
    public IngredientMapping()
    {
        Map(x => x.Name);
        Map(x => x.Amount);
        References(x => x.Recipe).Column("Recipe");
    }
}
public RecipeMapping : BaseMapping<Recipe>
{
    public RecipeMapping()
    {
        Map(x => x.Name);
        HasMany(x => x.Ingredients).KeyColumn("Recipe").Inverse().Cascade.All();
    }
}

我的代码：

public static void Main(string[] args)
{
    var recipe = new Recipe {
        Name = "Recipe"
    };

    var ingredient = new Ingredient {
        Name = "Ingredient",
        Amount = 1,
        Recipe = recipe
    };

    recipe.Ingredients = new List<Ingredient> { ingredient };

    ...

    session.Save(recipe);
    transaction.Commit(); // Error in this line
}

我的映射可能与某件事有关，因为当我保存不含任何成分的配方时，一切正常。我认为问题在于，nhibernate在保存父项之前会尝试保存成分，这会导致错误，因为Recipe与有效的食谱ID不匹配。但是我真的不知道如何解决它。

NHibernate无法插入有很多孩子的父母

0 个答案: