英文:
Marshalling pointers using mgo.Marshal()
问题
我想要对指针和数值进行不同的编码。目前，如果我们有一个结构体：
type Order struct {
Item Tool
AssociatedItem *Tool
}
在编组时，它们都会被内联到一个名为Order的文档中。
在处理*Tool的情况下，我需要能够执行自己的序列化操作。例如，在这种情况下，我只想存储Tool的Id而不是整个内容。不幸的是，mgo中的覆盖机制是为Tool定义SetBSON()和GetBSON()，但它不能区分指针和非指针。
处理这个问题的最佳方法是什么？
英文:
I want to encode pointers differently than from values. Currently, if we have a struct:
type Order struct {
Item Tool
AssociatedItem *Tool
}
both get inlined into a Order document inside mongo when marshalling.
I need to be able to perform my own serialization in the case of a *Tool. For instance, I could in this case only store the Id for the Too instead of the whole content. Unfortunately the overriding mechanism in mgo is to define a SetBSON() GetBSON for the Tool but it doesn't differentiate between pointers and non pointers.
What would be the best way to handle this?
答案1
得分: 2
使用不同类型的“指针”，例如：
type SelectiveTool Tool
func (st *SelectiveTool) SetBSON(raw bson.Raw) error {
return raw.Unmarshal(s)
}
type Order struct {
Item Tool
AssociatedItem *SelectiveTool
}
英文:
Use a different type for "pointers", for example:
type SelectiveTool Tool
func (st *SelectiveTool) SetBSON(raw bson.Raw) error {
return raw.Unmarshal(s)
}
type Order struct {
Item Tool
AssociatedItem *SelectiveTool
}
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