在给定JSON结构的情况下表示Golang结构

Question

type requestNodeType struct {
// edited: added the last part
    urls    []string  `json:"urls"` 
}

... some more code ... then a part where I set the gin router context ... c ->>> *gin.Context

and then ...

x, _ := ioutil.ReadAll(c.Request.Body)
fmt.Printf("crb2 = %s
", string(x))
uList := requestNodeType{}
json.Unmarshal(x, &uList)
// edited: updated prints for clarity 
fmt.Printf("json1 = %+v, %T - %p
", uList, uList, uList )
fmt.Printf("json2 = %+v, %T - %p
", uList.urls, uList.urls, uList.urls )
fmt.Printf("json3 = %+v, %T - %p
", uList.urls[0], uList.urls[0], uList.urls[0] )

gives me an output of:

crb2 = {"urls":["http://www.indeed.com/viewjob?jk=9388f66529358f6a", "http://www.indeed.com/viewjob?jk=53e937ef73c0c808"]}
json1 = {urls:[]}, main.requestNodeType - %!p(main.requestNodeType={[]})
json2 = [], []string - 0x0
2016/02/20 09:10:39 Panic recovery -> runtime error: index out of range

How can I represent this structure properly or fix my code?

Or even better, an idea to get c.BindJSON(&uList) to work for Gin ...?

Answer 1

Your JSON is invalid if it is really equal to

{["http://www.jobs.com/job?jk=9388f66529358f6a","http://www.job.com/job?jk=53e937ef73c0c808"]}

So your uList.URIs is empty. You could check for parsing error json.Unmarshal result.

Proper JSON for your model should look like

["http://www.jobs.com/job?jk=9388f66529358f6a","http://www.job.com/job?jk=53e937ef73c0c808"]

with struct like

type URLs []string

or

{"URLs": ["http://www.jobs.com/job?jk=9388f66529358f6a","http://www.job.com/job?jk=53e937ef73c0c808"]}

with struct like

type requestNodeType struct {
    URLs []string `json:"URLs"`
}

Also you can replace json.Unmarshal([]byte(string(x)), &uList) with json.Unmarshal(x, &uList) as x is already []byte.