How to define multiple name tags in a struct?

Question

I need to get an item from a mongo database, so I defined a struct like this
type Page struct {
    PageId string                 `bson:"pageId"`
    Meta   map[string]interface{} `bson:"meta"`
}

Now I also need to encode it to JSON, but it encodes the fields as uppercase (i get PageId instead of pageId) so i also need to define field tags for JSON. I tried something like this but it didn't work:
type Page struct {
    PageId string                 `bson:"pageId",json:"pageId"`
    Meta   map[string]interface{} `bson:"meta",json:"pageId"`
}

So how can this be done, define multiple name tags in a struct?

Gopher · Accepted Answer

It says in the documentation of the reflect packagee By convention, tag strings are a concatenation of optionally space-separated key:"value" pairs. Each key is a non-empty string consisting of non-control characters other than space (U+0020 ' '), quote (U+0022 '"'), and colon (U+003A ':'). Each value is quoted using U+0022 '"' characters and Go string literal syntax. What you need to do is to use space instead of comma as tag string separator. type Page struct { PageId string `bson:"pageId" json:"pageId"` Meta map[string]interface{} `bson:"meta" json:"meta"` }

Go Language

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