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encoding/json: Unmarshal and special character tag #10677

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cdeadlock opened this issue May 3, 2015 · 3 comments
Closed

encoding/json: Unmarshal and special character tag #10677

cdeadlock opened this issue May 3, 2015 · 3 comments
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@cdeadlock
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The below json demarshalling code will not detect the @rid field.

I can not tell what I am doing wrong here, is the @ symbol some kind of utf problem?

type TargetsResult struct{
  Result Targets "json: 'result'" 
}
type Targets []struct{
  Rid string "json: '@rid'"
  Toclaim string "json: 'toClaim'"
}

func TestJsonTarget(t *testing.T){
  //t.Skip()
  input := "{\"result\": [  {\"@rid\": \"#5:0\", \"toClaim\": \"testcode\"},{\"@rid\": \"#5:2\", \"toClaim\": \"second\"},{\"@rid\": \"#5:1\"}]}"
  var results TargetsResult
  if err := json.Unmarshal([]byte(input), &results); err != nil{
    fmt.Print(err) 
  }
  fmt.Print(results.Result)
}

Output:
[{ testcode} { second} { }]

If I unmarshal the same sample into the ugly

type TargetsResult map[string][]map[string]interface{}

I can access it with

results["result"][0]["@rid"].(string)

Besides this test where the input is a go string (a rune?) I also tested the actual result coming from an http REST response where the header specifically says utf8.
@mdempsky
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mdempsky commented May 3, 2015

If you use json:"@rid" instead, it works: http://play.golang.org/p/TcmPNuwFsd

I can't explain why "json: 'toClaim'" works though. It seems like that's actually a bug.

@mdempsky mdempsky changed the title encoding json Unmarshal and special character tag encoding/json: Unmarshal and special character tag May 3, 2015
@mdempsky
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mdempsky commented May 3, 2015

Oh, right, the other tags weren't actually working. It's just that your struct fields were already named "Result" and "Toclaim".

Closing since it seems to be working as intended.

@mdempsky mdempsky closed this as completed May 3, 2015
@cdeadlock
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Yes it appears I was confused by the super specific requirements for the struct tags:

You can not use single quote to make strings (' same key as double quote), only back-quote (` same key as tilde) this gives compilations errors

You can not have a space between the json: and the double quoted tag "@Rid" (no compilation errors, it just does not use it during demarshalling)
go version go1.2.1 linux/amd64

Thanks for the help

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@mdempsky @cdeadlock @gopherbot