当我在 .NET Core 应用程序中使用 Seeding 时，仅 DB Schema 会迁移，而无需我之前添加的虚拟数据

Question

我希望在 SQL 数据库中看到输入的数据，仅应用迁移而无需输入数据用于测试目的

这是一个数据播种的例子，我添加了类别的真实ID，以保持产品和类别之间的关系可靠

我在

IEntityTypeConfiguration<T>

 中使用 

OnModelCreating

 而不是 

DbContext

    public class CategoryConfiguration : IEntityTypeConfiguration<Category>
    {
        public void Configure(EntityTypeBuilder<Category> builder)
        {
            builder.HasKey(p => p.Id);

            builder.Property(p => p.Name)
                   .IsRequired();

            builder.HasMany(p => p.Products)
                   .WithOne(p => p.Category)
                   .HasForeignKey(p => p.CategoryId)
                   .OnDelete(DeleteBehavior.SetNull);

            var categories = new List<Category> {

            new Category
            {
                Id = Guid.Parse("bdafc3c9-abe6-4ac5-bdb6-8361524ff999"),
                Name = "Mobile Phones",
                CreateTime = DateTime.Now
            },
            new Category
            {
                Id = Guid.Parse("f5a4eb59-26b3-4784-b427-65b5f7f57052"),
                Name = "Laptops",
                CreateTime = DateTime.Now
            }
            };
            builder.HasData(categories);
        }
    }

    public class ProductConfiguration : IEntityTypeConfiguration<Product>
    {
        public void Configure(EntityTypeBuilder<Product> builder)
        {
            builder.HasKey(p => p.Id);

            builder.Property(p => p.Name)
                   .IsRequired();

            builder.Property(p => p.Price)
                   .IsRequired();

            builder.HasMany(p => p.Images)
                   .WithOne(p => p.Product)
                   .HasForeignKey(p => p.ProductId)
                   .OnDelete(DeleteBehavior.Cascade);

            var products = new List<Product> {
             new Product
            {
                Id = Guid.Parse("2cc1ca42-7f05-48e9-b223-886c5c98a4af"),
                Name = "IPhone 15 Pro",
                Description = "Titanum - 1TB",
                Price = 59.99,
                CategoryId = Guid.Parse("bdafc3c9-abe6-4ac5-bdb6-8361524ff999")
            },
            new Product
            {
                Id = Guid.Parse("c8faaae7-fee5-450c-ac98-0baaa046077d"),
                Name = "IPhone 13",
                Description = "Moonlight - 128GB",
                Price = 29.99,
                CategoryId = Guid.Parse("bdafc3c9-abe6-4ac5-bdb6-8361524ff999")
            },
            new Product
            {
                Id = Guid.Parse("e4b56b1a-6372-4e5b-9f61-03ee2b5e6b64"),
                Name = "MacBook Pro 16-inch",
                Description = "256GB SSD Storage / 8-Core CPU 8-Core GPU 8GB Unified Memory",
                Price = 1500.99,
                CategoryId = Guid.Parse("f5a4eb59-26b3-4784-b427-65b5f7f57052")
            },
            new Product
            {
                Id = Guid.Parse("0d7957d2-2ca7-43eb-b9e0-6e300da1a6b4"),
                Name = "MacBook Air 13-inch",
                Description = "M3 Max / 1TB / 16-core CPU 40-core GPU 48GB Unified Memory",
                Price = 1350.99,
                CategoryId = Guid.Parse("f5a4eb59-26b3-4784-b427-65b5f7f57052")
            }
            };
            builder.HasData(products);
        }
    }

Answer 1

即使使用

IEntityTypeConfiguration<T>

，您仍然需要指示DbContext应用这些配置。这通常在 DbContext 类中通过调用

ApplyConfigurationsFromAssembly

方法来实现。

public class ApplicationDbContext : DbContext
{
    public ApplicationDbContext(DbContextOptions<ApplicationDbContext> options)
        : base(options)
    {
    }

    protected override void OnModelCreating(ModelBuilder modelBuilder)
    {
        // Automatically applies all IEntityTypeConfiguration classes in the assembly
        modelBuilder.ApplyConfigurationsFromAssembly(typeof(ApplicationDbContext).Assembly);

        base.OnModelCreating(modelBuilder);
    }
}

在 DbContext 中注册配置后，运行迁移以确保正确反映数据播种。