Docs的最后一次更改是在02/26/2018,但是我需要修复一些重大更改。
我有MyProcessContext
类型,用于许多实体:
public class RequestData
{
public Guid CorrelationId { get; set; }
public DateTime Updated { get; set; }
public MyProcessContext ProcessContext { get; set; }
}
public class MyProcessContext
{
public int ClientId { get; set; }
}
public class EntityConfiguration : IEntityTypeConfiguration<RequestData>
{
public void Configure(EntityTypeBuilder<RequestData> builder)
{
// all mapped by convention
builder.OwnsOne(x => x.ProcessContext);
builder.Property(x => x.Updated).IsRowVersion();
builder.HasKey(x => x.CorrelationId);
builder.Property(x => x.CorrelationId).ValueGeneratedNever();
}
}
它可以与EF Core 2.0一起正常工作。在调试视图中,对于每种拥有类型(RequestData.ProcessContext#MyProcessContext
),我都有不同的实体类型:
EntityType: RequestData
Properties:
CorrelationId (Guid) Required PK AfterSave:Throw 0 0 0 -1 -1
Annotations:
Relational:ColumnName: correlation_id
Updated (DateTime) Required Concurrency BeforeSave:Ignore AfterSave:Ignore ValueGenerated.OnAddOrUpdate 11 11 -1 -1 0
Annotations:
Relational:ColumnName: updated
Navigations:
ProcessContext (<ProcessContext>k__BackingField, MyProcessContext) ToDependent RequestData.ProcessContext#MyProcessContext 0 -1 1 -1 -1
Keys:
CorrelationId PK
Annotations:
Relational:TableName: process_request
RelationshipDiscoveryConvention:NavigationCandidates: System.Collections.Immutable.ImmutableSortedDictionary`2[System.Reflection.PropertyInfo,System.Type]
EntityType: RequestData.ProcessContext#MyProcessContext
Properties:
RequestDataCorrelationId (no field, Nullable<Guid>) Shadow Required PK FK AfterSave:Throw 0 0 0 0 -1
ClientId (int) Required 1 1 -1 -1 -1
Keys:
RequestDataCorrelationId PK
Foreign keys:
RequestData.ProcessContext#MyProcessContext {'RequestDataCorrelationId'} -> RequestData {'CorrelationId'} Unique ToDependent: ProcessContext
Annotations:
Relational:TableName: process_request
RelationshipDiscoveryConvention:NavigationCandidates: System.Collections.Immutable.ImmutableSortedDictionary`2[System.Reflection.PropertyInfo,System.Type]
升级后调试视图包含
EntityType: RequestData
...
ProcessContext (<ProcessContext>k__BackingField, MyProcessContext) ToDependent MyProcessContext 0 -1 1 -1 -1
...
EntityType: MyProcessContext
Properties:
RequestDataCorrelationId (no field, Guid) Shadow Required PK FK AfterSave:Throw 0 0 0 0 -1
ClientId (int) Required 1 1 -1 -1 -1
Keys:
RequestDataCorrelationId PK
Foreign keys:
MyProcessContext {'RequestDataCorrelationId'} -> RequestData {'CorrelationId'} Unique Ownership ToDependent: ProcessContext
Annotations:
Relational:TableName: process_request
RelationshipDiscoveryConvention:NavigationCandidates: System.Collections.Immutable.ImmutableSortedDictionary`2[System.Reflection.PropertyInfo,System.Type]
像MyProcessContext
这样构建的模型是通常的实体。在类似
foreach (var entity in modelBuilder.Model.GetEntityTypes())
{
var entityIsOwned = entity.IsOwned();
entityIsOwned
是正确的,但entity.DefiningNavigationName
现在为null。
我需要custom name convention的名字。
答案 0 :(得分:1)
到目前为止,唯一的正式更改(EF Core 2.1)是添加了[Owned] Attribute。
然而,显然实现中发生了重大变化,因此DefiningEntityType
和DefiningNavigationName
属性不再可靠(无论如何都没有记录-只是“标准”生成的无用”定义实体类型。” 和“获取定义导航的名称。” )。
通过实验,我发现只有在多个实体中使用拥有的类型时,才会填充它们。不知道为什么要这样做,但主要要点是我们不应该使用它们,而且EF Core代码本身似乎也不再使用它们。
根据我的发现,IsOwned
,DefiningEntityType
和DefiningNavigationName
项由具有IsOwnership
属性等于true
的外键确定。
换句话说:
var ownershipFk = entityType.GetForeignKeys().FirstOrDefault(fk => fk.IsOwnership);
var isOwned = ownershipFk != null;
var definingEntityType = ownershipFk?.PrincipalEntityType;
var definingNavigationName = ownershipFk?.PrincipalToDependent.Name;