ng-repeat and nested array in json - arrays

Question

i have some problems accessing some values stored in a json with the directive ng-repeat.
the json is formatted properly (checked it with a json checker) and it's called via $http service. unfortunately i can't change the format of json, retrieved through the wordpress-json-api plugin.
the json (with some cuts):
{
"status": "ok",
"count": 10,
"count_total": 24,
"pages": 3,
"posts": [
{
"id": 108,
"type": "sensor",
"slug": "ert",
"custom_fields": {
"sensor_id": [
"er"
],
"coords": [
"{\"address\":\"\",\"lat\":55.39979700000003,\"lng\":10.430533275390644,\"zoom\":12}"
]
}
}
//etc other posts following, json correct
Now i have a problem accessing the single values inside coords. i complained too about serializing data in db, but i'd like anyway to get lng and lat out of that array
<ul>
<li ng-repeat="post in sensor.posts">
<h4>name : {{post.id}}</h4> //ok
<h4>all custom fields : {{post.custom_fields}}</h4> //good-this-too
<h4>custom field lat : {{post.custom_fields.prova_coords[0]}}</h4> //works but can't go on
</li>
</ul>
the ouput of last line is:
custom field lat : {"address":"","lat":55.39979700000003,"lng":10.430533275390644,"zoom":12}
but now i'm stuck..can't retrieve single lat and long values

Answer 1

You need to use $scope.$eval(coordsString)
Here's a test: http://jsfiddle.net/mikeeconroy/Rnc7R/
var objString = "{\"address\":\"\",\"lat\":55.39979700000003,\"lng\":10.430533275390644,\"zoom\":12}";
$scope.coords = $scope.$eval(objString);
Then you can refer to coords.lat or coords.lng in your template like so:
<div ng-controller="myCoordsCtrl">
Lattitude: {{coords.lat}}<br>
Longitude: {{coords.lng}}
</div>
Since this is happening within an ngRepeat you may need to use an Angular filter to rectify the string on the fly
<li ng-repeat="post in sensor.posts | myRectifyCoordsFilter">
EDIT:
Don't use the filter like in the above example, using filters to modify $scope is not a good situation. You'll need to modify your $scope prior to using it in the ng-repeat
$http.get().success(function(data){
angular.forEach(data,function(val,key){
this.coords = $scope.$eval(val.coords[0]);
},data);
$scope.sensor = data;
});