Databases
StackOverflow2013
Postsdbo
POGo's json decoder isn't working on the simplest possible input. Why?
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POGo's json decoder isn't working on the simplest possible input. Why?
    primarykey
    data
    text
    <p>I'm preparing to write an AJAX type app in Go and this is a sample app to get familiar with how it would work. But it doesn't. The InputRec (irec) fields just have zeroes after the decode. First the source:</p> <pre><code>package main import ( "net/http" "encoding/json" "fmt" // "io/ioutil" ) type InputRec struct { a, b float64 } type RetRec struct { sum float64 } func addHandler(w http.ResponseWriter, r *http.Request) { var outJson []byte var irec InputRec var orec RetRec /* inJson, err := ioutil.ReadAll(r.Body) num := len(inJson) if err != nil { panic("Error on reading body") } r.Body.Close() err = json.Unmarshal(inJson, &amp;irec) fmt.Println("Input ", num, " bytes: ", string(inJson)) */ decoder := json.NewDecoder(r.Body) err := decoder.Decode(&amp;irec) if err != nil { panic("Error on JSON decode") } orec.sum = irec.a + irec.b fmt.Println("a: ", irec.a, " b: ", irec.b, " Sum: ", orec.sum) outJson, err = json.Marshal(orec) if err != nil { panic("Error on JSON encode") } w.Header().Set("Content-Type", "application/json") _, err = w.Write(outJson) if err != nil { panic("Error writing response") } } func main() { http.HandleFunc("/", addHandler) http.ListenAndServe(":1234", nil) } </code></pre> <p>Now the test:</p> <pre><code>curl -X POST -i -d '{"a":5.4,"b":8.7}' http://localhost:1234/ HTTP/1.1 200 OK Content-Type: application/json Content-Length: 2 Date: Sun, 23 Jun 2013 17:01:08 GMT {} </code></pre> <p>Note that I know the request body is making it to the function, because I have tried it with the commented out code instead of shorter json.Decoder lines, and it printed the request body as expected.</p> <p>When making said curl request, this appears as the output from the Println command:</p> <p>a: 0 b: 0 Sum: 0</p> <p>Seems pretty clear that the json fields line up to InputRec (just a and b) so what is wrong here?</p> <p>Thanks much!</p>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. This table or related slice is empty.
    1. USMicah Yoder
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. COand similar with the output. I would have exptected {sum:0} if not the correct answer. Why is it blank?
      singulars
      1. POGo's json decoder isn't working on the simplest possible input. Why?
      1. USMicah Yoder
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload