An alternative is to use a bidirectional or many-to-one association and let DealCharge take care of the association.
另一种做法是使用双向或many - to - one关联，让DealCharge来管理关联。
You can make similar arguments for bidirectional one-to-many and many-to-one when you navigate from the one side (the children entities) to the many side (the parent entity).
one-to-many和many-to-one的双向关联也是类似的，当你从多端（子实体）定位到一端（父实体）。
Due to the many-to-many nature, loading from one side of a bidirectional association can trigger loading of the other side which can further trigger extra data loading of the original side, and so on.
由于many-to - many的特性，在双向关联的一端加载对象会触发另一端的加载，这会进一步触发原始端加载更多的数据，等等。
Due to the many-to-many nature, loading from one side of a bidirectional association can trigger loading of the other side which can further trigger extra data loading of the original side, and so on.
由于many-to - many的特性，在双向关联的一端加载对象会触发另一端的加载，这会进一步触发原始端加载更多的数据，等等。
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