在.Net中将嵌套对象保存到领域数据库 [英] Saving Nested Objects to Realm Database in .Net
问题描述
我是新手,但是在保存嵌套对象方面遇到很多麻烦.我可以保存父代,但是会得到Realms.Exceptions.RealmObjectManagedByAnotherRealmException
并说Cannot start to manage an object with a realm when it's already managed by another realm
.我只有一个领域,正在创建一个新对象!
I'm new to realm and I'm having a lot of trouble getting a nested object to save. I can save the parent, but I get a Realms.Exceptions.RealmObjectManagedByAnotherRealmException
saying Cannot start to manage an object with a realm when it's already managed by another realm
. I only have one realm and I'm creating a new object!
这是父类的样子:
public class Transaction : RealmObject
{
[PrimaryKey]
public string ID { get; set; } = Guid.NewGuid().ToString();
...
public IList<TransactionDetails> Rows { get; }
}
这是孩子:
public class TransactionDetails : RealmObject
{
[PrimaryKey]
public string ID { get; set; } = Guid.NewGuid().ToString();
public Account Account { get; set; } = new Account();
public double Amount { get; set; }
...
}
在我要保存对象的类的构造函数中,我有realm = Realm.GetInstance( config );
.
In the constructor for the class where I'm trying to save the object I have realm = Realm.GetInstance( config );
.
这是我最近的尝试,其中我尝试在单独的写事务中写详细信息,但没有用.
This is my latest attempt in which I tried to write the details in a separate write transaction but it didn't work.
var transaction = new Models.Transaction();
...
realm.Write( () => realm.Add( transaction, update: true ) );
foreach ( var details in Trans.Rows )
{
var row = new TransactionDetails();
...
//realm.Add( details );
//realm.Write( () => realm.Add( details ) );
realm.Write( () => transaction.Rows.Add( details ) ); // Error here every time
}
文档根本没有帮助.
推荐答案
您只需编写一次即可.
var transaction = new Models.Transaction();
...
foreach ( var details in Trans.Rows )
{
var row = new TransactionDetails();
...
transaction.Rows.Add( details ); // Error here every time
}
realm.Write( () => realm.Add( transaction, update: true ) );
最好将其包装在交易中.
You would be better off wrapping this in a transaction.
using (Transaction _transaction = realm.BeginWrite())
{
var trans = new Models.Transaction();
...
realm.Add(trans);
foreach ( var details in Trans.Rows )
{
var row = new TransactionDetails();
...
trans.Rows.Add( details ); // Error here every time
}
_transaction.Commit();
}
我已经使用Realm和Xamarin Forms编写了一个应用程序.代码在GitHub上发布, https://github.com/rsatter/PRO-PD/tree/master/PRO-PD .
I have written an app using Realm and Xamarin Forms. Code is released on GitHub, https://github.com/rsatter/PRO-PD/tree/master/PRO-PD.
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