问题描述
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我有一个帐户表,用于存储主帐户和子帐户。主帐户与子帐户基本相同,区别在于主帐户可以具有关联公司。帐户是一个抽象类,Masteraccount和SubAccount都从该类派生。
Masteraccount是任何具有空ParentAccountId的帐户条目。如果帐户记录具有ParentAccountId,则它是一个SubAccount,并且ParentAccountId引用Masteraccount的AccountId字段。
我正在尝试为他们获取FluentNhibernate映射。
这些类如下所示
public class Account : EntityBase
{
public Account() { }
public virtual string AccountNumber { get; set; }
public virtual string AccountName { get; set; }
public virtual string ContactRole { get; set; }
public virtual bool EmailBillDataFile { get; set; }
public virtual bool EmailBill { get; set; }
public virtual bool PostBill { get; set; }
public virtual BillingMethod BillingMethod { get; set; }
public virtual BillingAddresstype BillingAddresstype { get; set; }
public virtual Contact Contact { get; set; }
public virtual bool IsInvoiceRoot { get; set; }
public virtual string Password { get; set; }
public virtual bool HasRequestedInvoicing { get; set; }
public virtual bool IsInternational { get; set; }
public virtual decimal AmountPaid { get; set; }
public virtual decimal PrevIoUsBill { get; set; }
public virtual void MakePayment(decimal amount)
{
MakePayment(amount,null);
}
public virtual void MakePayment(decimal amount,string invoiceNumber)
{
AmountPaid += amount;
if (string.IsNullOrEmpty(invoiceNumber))
LogActivity(string.Format(\"Made payment of {0:c}\",amount));
else {
LogActivity(string.Format(\"Made payment of {0:c} on Invoice \'{1}\'\",amount,invoiceNumber));
}
}
public virtual Invoice CreateInvoice()
{
Invoice invoice;
invoice = IsInternational ? new NoGstInvoice() : new Invoice();
// Can update invoice properties that rely on account data here.
return invoice;
}
#region Business Rules
public override IEnumerable<RuleViolation> GetRuleViolations()
{
if (string.IsNullOrEmpty(AccountName))
yield return new RuleViolation(\"Account Name required\",\"AccountName\");
if (string.IsNullOrEmpty(AccountNumber))
yield return new RuleViolation(\"Acocunt Number required\",\"AccountNumber\");
if (string.IsNullOrEmpty(Password))
yield return new RuleViolation(\"Password required\",\"Password\");
yield break;
}
#endregion
}
public class Masteraccount : Account
{
private Company _company;
private IList<SubAccount> _subAccounts;
public Masteraccount() : this(null) { }
public Masteraccount(Company company)
{
_company = company;
_subAccounts = new List<SubAccount>();
}
public virtual Company Company
{
get { return _company; }
}
public virtual IEnumerable<SubAccount> SubAccounts
{
get { return _subAccounts; }
}
public virtual SubAccount CreateSubAccount(string accountNumber,string accountName)
{
var subAccount = new SubAccount(this)
{
AccountName = accountName,AccountNumber = accountNumber,Contact = this.Contact,ContactRole = this.ContactRole,PrevIoUsBill = 0,AmountPaid = 0,BillingAddresstype = this.BillingAddresstype,BillingMethod = this.BillingMethod,IsInternational = this.IsInternational,IsInvoiceRoot = false,EmailBill = this.EmailBill,EmailBillDataFile = this.EmailBillDataFile,Password = this.Password,PostBill = this.PostBill
};
return subAccount;
}
}
public class SubAccount : Account
{
private Masteraccount _masteraccount;
public SubAccount() { }
public SubAccount(Masteraccount master)
{
_masteraccount = master;
}
public virtual Masteraccount Masteraccount
{
get { return _masteraccount; }
}
}
我的映射是:
public class AccountMap : ClassMap<Account>
{
public AccountMap()
{
Table(\"Account\");
Id(x => x.Id).Column(\"AccountId\").GeneratedBy.Identity();
Map(x => x.AccountName).Length(50).Not.Nullable();
Map(x => x.AccountNumber).Length(10).Not.Nullable();
Map(x => x.ContactRole).Length(50);
Map(x => x.BillingMethod).Not.Nullable();
Map(x => x.EmailBill).Not.Nullable();
Map(x => x.PostBill).Not.Nullable();
Map(x => x.EmailBillDataFile).Not.Nullable();
Map(x => x.BillingAddresstype).Not.Nullable();
Map(x => x.IsInvoiceRoot).Not.Nullable();
Map(x => x.HasRequestedInvoicing).Not.Nullable();
Map(x => x.IsInternational).Not.Nullable();
Map(x => x.PrevIoUsBill).Not.Nullable();
Map(x => x.AmountPaid).Not.Nullable();
Map(x => x.Password).Length(20).Not.Nullable();
References(x => x.Contact).Column(\"ContactId\").Not.Nullable();
discriminateSubClassesOnColumn(\"ParentAccountId\");
}
}
public class MasteraccountMap : SubclassMap<Masteraccount>
{
public MasteraccountMap()
{
References(x => x.Company).Column(\"CompanyId\");
HasMany(x => x.SubAccounts).KeyColumn(\"ParentAccountId\").Inverse().Cascade.All();
}
}
public class SubAccountMap : SubclassMap<SubAccount>
{
public SubAccountMap()
{
References(x => x.Masteraccount).Column(\"ParentAccountId\").Not.Nullable();
}
}
但是,当我执行以下测试时:
[Test]
public void Can_add_subAccount_to_database()
{
var master = Session.Get<Masteraccount>(1);
var subAccount = master.CreateSubAccount(\"TST123\",\"Test Account\");
Session.Save(subAccount);
Session.Flush();
Session.Clear();
var fromDb = Session.Get<SubAccount>(subAccount.Id);
Assert.AreNotSame(subAccount,fromDb);
}
我在Session.Save(subAccount);上遇到异常线。
System.ArgumentOutOfRangeException : Index was out of range. Must be non-negative and less than the size of the collection.
Parameter name: index
如果我注释掉SubAccountMap中的References映射,则不会出现异常。
任何帮助正确映射此关系表示赞赏。
解决方法
似乎我需要在DiscriminateSubClassesOnColumn上使用Formula方法
DiscriminateSubClassesOnColumn(\"\").Formula(\"case when parentaccountid is null then \'0\' else \'1\' end\");
然后在每个子类中使用以下内容
DiscriminatorValue(\"0\"); // In MasterAccountMap
DiscriminatorValue(\"1\"); // in SubAccountMap
参见http://wiki.fluentnhibernate.org/Fluent_mapping