[Dancer-users] to_json not JSON-ifying the entire variable
Naveed Massjouni
naveedm9 at gmail.com
Mon Oct 11 06:49:52 CEST 2010
On Sun, Oct 10, 2010 at 11:18 PM, P Kishor <punk.kish at gmail.com> wrote:
> On Thu, Oct 7, 2010 at 5:03 PM, P Kishor <punk.kish at gmail.com> wrote:
>> I have a data object in JavaScript that I am JSONifying, sending to
>> the server (using jQuery ajax) and storing in a SQLite table. In
>> SQLite, the values look like so (I have prettified it by adding
>> returns and tabs)
>>
>> [
>> {
>> "a":{"aa":0,"ab":448960000,"ac":"140075520.00"},
>> "b":1,
>> "c":"foo"
>> }
>> ]
>>
>> I retrieve it via ajax again, and use Dancer's to_json method to send
>> the result back. In Firebug, it shows up as
>>
>> [
>> {
>> "a":"{\"aa\":0,\"ab\":448960000,\"ac\":\"140075520.00\"}",
>> "b":1,
>> "c":"foo"
>> }
>> ]
>>
>> In other words, to_json seems to stringify all 2nd-level and deeper
>> values. As a result, while the entire value is returned as a JSON
>> object, its internal parts are recognized as strings. That doesn't
>> seem right, no? Its like drinking a cup of coffee, but three sips in
>> finding it to be hot chocolate.
>>
>> I can get around it by reparsing the strings as JSON, but it really
>> shouldn't be so. The data are stored in the SQLite table as a string,
>> so to_json should JSON-ify it all the way through, and send it back as
>> a fully-formed JSON object.
>>
>
>
> The above is really proving to be a bit of a headache for me. Because
> to_json is escaping the quotes in the variable, I am not able to
> reconstruct the JSON object back in my browser. I am using the json
> converter from http://www.json.org/json2.js to convert, but I am
> getting a "syntax error" when I try to use `JSON.parse(data)` where
> data has been retrieved by the browser.
>
> Any suggestions.
>
> --
> Puneet Kishor
> _______________________________________________
> Dancer-users mailing list
> Dancer-users at perldancer.org
> http://www.backup-manager.org/cgi-bin/listinfo/dancer-users
>
I have written this simple dancer app which works fine:
#!/usr/bin/env perl
use Dancer;
get '/' => sub {
return q[
<html>
<head>
<script>
function foo() {
var x = new XMLHttpRequest();
x.open("GET", "/foo", false);
x.send();
alert(x.responseText);
}
</script>
</head>
<body>
<input type="button" value="Go" onclick="foo()" />
</body>
</html>
];
};
get '/foo' => sub {
return q[
{
"a": {"aa":0,"ab":448960000,"ac":"140075520.00"},
"b": 1,
"c": "foo"
}
];
};
dance;
The problem I think you are having is that you are calling to_json on
a json string. You are serializing something that is already
serialized. Just return what is in your sqlite database without
calling to_json on it.
-Naveed
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