blocks|key|1349970|text|尝试映射接口IProduct而不是具体的类Product。(注意，我不是在讨论映射类Order的Product字段。)|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1349971|entityMap^0|6|8|L|7|16|5|1C|7|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]|$9|K|A|L|B|C]|$9|M|A|N|B|C]|$9|O|A|P|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|Q|8|@]|D|@]|E|$]]]|G|$]]

Try mapping the interface <code>IProduct</code> instead of the concrete class <code>Product</code>. (Note, I'm not talking about mapping the <code>Product</code> field of class <code>Order</code>.)

blocks|key|49673|text|您可以使用适当的继承模型将interface->实现关系映射为继承关系。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|49674|这将意味着映射IProduct，然后在IProduct映射中创建Product的子类映射，例如使用每个层次结构的表。|49675|这还允许您映射不属于IProduct接口的产品类中的其他数据，还允许您以相同的方式映射其他IProduct实现。|49676|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|H|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|I|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|J|8|@]|9|@]|A|$]]|$1|F|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|G|$]]

You could map the interface->implementation relationship as an inheritance relationship, using an appropriate inheritance model.

That would mean mapping IProduct and then creating a subclass map of Product in the IProduct mapping, for example using table-per-hierarchy.

That would also let you map additional data in the product class that is not part of the IProduct interface, and also let you map additional IProduct implementations in the same way if you wish to.

blocks|key|1351622|text|我一直致力于改进Fluent对代理接口的支持。有几个有用的补丁附加到问题256和257，但他们真的需要手动指定所有内容。我更进一步，添加了对设置代理和更改基础映射类的引用类型(可能是代理)的支持，并添加了一个新的约定(ProxyConvention)来自动设置所有这些-只需使用一个从映射类派生代理接口的函数来实例化它，它应该负责其余的工作。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1351623|目前的一个漏洞是它不能提取在.hbm.xml文件中显式指定的任何定义。|1351624|该修补程序已附加到issue+256|offset|length|1351625|entityMap|0|LINK|mutability|MUTABLE|url|http://code.google.com/p/fluent-nhibernate/issues/detail?id=256^0|0|0|9|9|0|0^^$0|@$1|2|3|4|5|6|7|P|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|Q|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|R|8|@]|9|@$F|S|G|T|1|U]]|A|$]]|$1|H|3|-4|5|6|7|V|8|@]|9|@]|A|$]]]|I|$J|$5|K|L|M|A|$N|O]]]]

I've been working on improving the support for proxy interfaces in Fluent. There were a couple of useful patches attached to issues 256 and 257, but they really needed everything specified manually. I've taken these a step further and added support for setting proxies and changing the types of references from the inferred (which would be the proxy) to the underlying mapped class, and added a new convention (ProxyConvention) to set it all up automatically - just instantiate it with a function to derive the proxy interface from a mapped class, and it should take care of the rest. 

The one loophole at the moment is that it can't pick up any definitions specified explicitly in .hbm.xml files.

The patch is attached to <a href="http://code.google.com/p/fluent-nhibernate/issues/detail?id=256" rel="nofollow noreferrer">issue 256</a>

blocks|key|1350015|text|我想你要找的是.References<Product>(x=>x.Product,+"ProductId");|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1350016|顺便说一句，.HasMany<>也是如此。|1350017|这似乎与xml中的<...+class="Product"++/>做同样的事情。|1350018|我不建议映射到接口，因为它打破了使用一个接口的全部要点-一旦开始实现IStorable，您就会遇到问题，而NH无法处理多重继承。|1350019|entityMap^0|7|1C|0|6|A|0|9|O|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@$9|O|A|P|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|Q|8|@$9|R|A|S|B|C]]|D|@]|E|$]]|$1|H|3|I|5|6|7|T|8|@$9|U|A|V|B|C]]|D|@]|E|$]]|$1|J|3|K|5|6|7|W|8|@]|D|@]|E|$]]|$1|L|3|-4|5|6|7|X|8|@]|D|@]|E|$]]]|M|$]]

I think what you're looking for is <code>.References&lt;Product&gt;(x=&gt;x.Product, "ProductId");</code>

Incidentally the same is true for <code>.HasMany&lt;&gt;</code>

This seems to do the same as <code>&lt;... class="Product" /&gt;</code> in xml

I wouldn't recommend mapping to the interface as it breaks the whole point of using one - you run into problems as soon as it starts implementing IStorable and NH can't cope with the multiple inheritance.

given the following class definition:

<pre><code>public class Order {
 public IProduct Product {get;set;}
}
</code></pre>

I have this (fluent) mapping

<pre><code>References(x=&gt;x.Product, "ProductId");
</code></pre>

And get this exception: An association from the table Orders refers to an unmapped class, which makes sense because it doesn't know what implementation I will pass to it.

I understand why I have to define the type in the mapping (IProduct could be anything) but I'm not sure how to do it.

Thanks,

Kyle

How do you map an entity -> interface relationship using Fluent NHibernate?

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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给定以下类定义：public class Order {  public IProduct Product {get;set;}}我有这个(流畅的)映射References(x=>x.Product, "ProductId");还有一个例外:表Orders中的一个关联引用了一个未映射的类，这是有意义的，因为它不知道我将...

问如何使用Fluent NHibernate映射实体->接口关系？
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问如何使用Fluent NHibernate映射实体->接口关系？EN