unmarshal map of slices to struct

[Sergey Gavruk]

Hello.

I have an object 

params map[string][]string

Is there any quick way to convert this object to any struct type, like json unmarshal?

[Sergey Gavruk]

My usecase:

I want to parse request.Form (which is map[string][]string) to any struct. I can use reflection, but its very complicated. I hope there is any way to do it more simple.

[Tamás Gulácsi]

If you know the target struct beforehand, then you can write code for it. If not, then only reflection can help. Encoding/json.Marshal can marshal such datatype, then you can Unmarshal it to a properly tagged struct, but this is a very lazy solution.

[Athiwat Chunlakhan]

Take a look at http://www.gorillatoolkit.org/pkg/schema

It's use to convert http stuff (which is a normal map)

[Sergey Gavruk]

Wow, that exactly what I need. Thank you!

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Best regards,
Sergey Gavruk

[Kevin Gillette]

schema is fairly useful in practice, though it has a few limitations, such as a rather non-idiomatic style for registering custom unmarshalers (the idiomatic style would be to not register anything at all, but to define methods akin to json.Unmarshaler).

[Derek Perkins]

On Monday, October 7, 2013 5:52:57 AM UTC-6, Tamás Gulácsi wrote:

If you know the target struct beforehand, then you can write code for it. If not, then only reflection can help. Encoding/json.Marshal can marshal such datatype, then you can Unmarshal it to a properly tagged struct, but this is a very lazy solution.

Tamás - Assuming I had a very simple struct like below, how would I write my UnmarshalJSON function to not use reflection?

type Mytest struct {

Field1 int32

Field2 string

}

[Tamás Gulácsi]

For such small structs you can write a json parser by hand, but using a generator (such as https://github.com/benbjohnson/megajson/blob/master/README.md) is less error prone, imho.