Re: [go-nuts] how to check if url.Values contain some attributes or not ?

[Scott Lawrence]

On Thu, 28 Mar 2013, suhas kodgire wrote:

>
> I have written a web service in which I send parameters as query string .
> In the program I convert those parameters to url.Values by Query method .
>
> I get all the parameters there when I print them on console , I get
> following result
>
> map[page_number:[1] per_page:[24] filters[min_price]:[0] filters[dogs]:[0]
> filters[cats]:[0]]
>
>
> Now I need to check if parameter contains any fiilters .
>
> One way to do it check for params["filters[min_price]"] ,
> params["filters[dog]"] , params["filters[cat]"] etc with empty (nil)
> condition .
> Is there any way to check this effectively ?

The actual type of url.Values is "map[string][]string". So you can loop over
the keys,

for key, val := range myUrl.Query() {
if strings.IsPrefix("filters", key) {
doFilter(key, val)
}
}

Or something along those lines.

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--
Scott Lawrence

go version go1.0.3
Linux baidar 3.8.3-2-ARCH #1 SMP PREEMPT Sun Mar 17 13:04:22 CET 2013 x86_64 GNU/Linux

[Kyle Lemons]

Are you looking for something like

if _, ok := r.Form[key]; ok {

  // key exists as a param

}

On Thu, Mar 28, 2013 at 8:27 AM, suhas kodgire <kodgir...@gmail.com> wrote:

I have written a web service in which I send parameters as query string . In the program I convert those parameters to url.Values by Query method .

I get all the parameters there when I print them on console , I get following result

map[page_number:[1]  per_page:[24] filters[min_price]:[0] filters[dogs]:[0] filters[cats]:[0]]


Now I  need to check if parameter contains any fiilters .

One way to do it check  for params["filters[min_price]"] , params["filters[dog]"] , params["filters[cat]"] etc with empty (nil) condition .
Is there any way to check this effectively  ?

--

[suhas kodgire]

Thanks for the quick reply , I was looking for he similar thing .
I used HasPrefix to achieve that

   for key, val := range title {
      if strings.HasPrefix(key,"filters") {
          fmt.Println(key,":",val)