我一直在asp.net core 2.0项目中使用value对象,该项目在该项目上正常运行。
我将项目更新为2.1,它给了我一个错误
Invalid object name 'EntityAdress'.
实体:
public class Company : AuditableEntity<long>
{
public int SalesRepId { get; set; }
public string Name { get; set; }
public int StatusId { get; set; }
public EntityAdress Addresses { get; set; }
public string BillingAddress { get; set; }
}
public class EntityAdress : ValueObject
{
private EntityAdress() { }
public string Address { get; set; }
public string City { get; set; }
public string State { get; set; }
public int Zip { get; set; }
protected override IEnumerable<object> GetAtomicValues()
{
yield return Address;
yield return City;
yield return State;
yield return Zip;
}
}
ValueObject的实现与Link for the eshopContainer examples of value objects完全相同
我用于包含DbContext
的项目的包
<Project Sdk="Microsoft.NET.Sdk">
<PropertyGroup>
<TargetFramework>netcoreapp2.1</TargetFramework>
<RuntimeFrameworkVersion>2.1.6</RuntimeFrameworkVersion>
</PropertyGroup>
<ItemGroup>
<PackageReference Include="IdentityServer4.AspNetIdentity" Version="1.0.1" />
<PackageReference Include="IdentityServer4.EntityFramework" Version="2.1.1" />
<PackageReference Include="Microsoft.EntityFrameworkCore.Design" Version="2.1.0" />
<PackageReference Include="Microsoft.EntityFrameworkCore.SqlServer" Version="2.1.0" />
<PackageReference Include="Microsoft.Extensions.Logging" Version="2.1.0" />
<PackageReference Include="Microsoft.Extensions.Configuration.FileExtensions" Version="2.1.0" />
<PackageReference Include="Microsoft.Extensions.Configuration.Json" Version="2.1.0" />
</ItemGroup>
</Project>
语境:
protected override void OnModelCreating(ModelBuilder modelBuilder)
{
modelBuilder.RemovePluralizingTableNameConvention();
modelBuilder.OnDeleteCascading();
modelBuilder.ApplyConfiguration(new CompanyEntityTypeConfiguraton());
base.OnModelCreating(modelBuilder);
}
公司实体类型配置:
public class CompanyEntityTypeConfiguraton : IEntityTypeConfiguration<Company>
{
public void Configure(EntityTypeBuilder<Company> orderConfiguration)
{
orderConfiguration.OwnsOne(p => p.Addresses, cb =>
{
cb.Property(p => p.City).HasColumnName("City");
cb.Property(p => p.Address).HasColumnName("Address");
cb.Property(p => p.State).HasColumnName("State");
cb.Property(p => p.Zip).HasColumnName("Zip");
});
}
}
在删除级联和删除PluralizingTableNameConvention:
public static class ModelBuilderExtensions
{
public static void RemovePluralizingTableNameConvention(this ModelBuilder modelBuilder)
{
foreach (IMutableEntityType entity in modelBuilder.Model.GetEntityTypes())
{
entity.Relational().TableName = entity.DisplayName();
}
}
public static void OnDeleteCascading(this ModelBuilder modelBuilder)
{
foreach (var relationship in modelBuilder.Model.GetEntityTypes().SelectMany(e => e.GetForeignKeys()))
{
relationship.DeleteBehavior = DeleteBehavior.Restrict;
}
}
}
可能是问题的原因是什么?是实体框架版本的问题还是实现中缺少的东西?
EF Core版本之间的实现总会有一些变化。有些可能是错误修复,这可能导致旧代码以不同方式运行。
问题是这段代码:
public static void RemovePluralizingTableNameConvention(this ModelBuilder modelBuilder)
{
foreach (IMutableEntityType entity in modelBuilder.Model.GetEntityTypes())
{
entity.Relational().TableName = entity.DisplayName();
}
}
首先,您应该排除拥有的类型(记住拥有的类型仍然是EF Core中的实体,因此包含在GetEntityTypes()
中):
modelBuilder.Model.GetEntityTypes().Where(t => !t.IsOwned())
否则,您正在更改EF Core默认行为,即不为所拥有的实体创建单独的表(所谓的表拆分)以实际创建单独的表,因此当EF Core构建SQL查询连接到表时,您将获得该异常不存在。
其次,你应该在所有流畅的配置之后调用该代码,因为在开始时所拥有的实体(如果没有用[Owned]
属性标记)还没有被识别出来 - 它只在OwnsOne
调用之后才会发生。
protected override void OnModelCreating(ModelBuilder modelBuilder)
{
modelBuilder.ApplyConfiguration(new CompanyEntityTypeConfiguraton());
base.OnModelCreating(modelBuilder);
modelBuilder.RemovePluralizingTableNameConvention();
modelBuilder.OnDeleteCascading();
}