使用代码优先实体框架播种数据库 - 外键语法

Question

我试图找到正确的语法来种植具有测试数据的数据库.我的产品表有一个外键.这是类别.我已经在数据库中播放了类别的值,但仍坚持如何将该关系添加到产品中.我试过这种方式无济于事.

context.Categories.AddOrUpdate(x => x.Name,
    new Category
    {
        Name = "Fruit"
    });

context.Products.AddOrUpdate(x => x.Name,
    new Product
    { 
       Name = "Cherries",
       Description = "Bing Cherries",
       Measure = "Quart Box",
       Price = 1.11M,
       Category = context.Categories.FirstOrDefault(x => x.Name == "Fruit")
    }
});

谁能指出我正确的方向？

Answer 1

我发现,为了从Category中完成外键,就是对上下文进行保存更改.然后我能够查询categoryId的上下文并将其保存到产品的CategoryId中.

context.Categories.AddOrUpdate(x => x.Name,
    new Category
    {
        Name = "Fruit"
    });

context.SaveChanges();

context.Product.AddOrUpdate(x => x.Name,
    new Product 
    { 
        Name = "Cherries",
        Description = "Bing Cherries",
        Measure = "Quart Box",
        Price = 1.11M,
        CategoryId = context.Categories.FirstOrDefault(x => x.Name == "Fruit").Id
    });