One dimensional array of strings being parsed to 2d by angular resource

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The following JSON response from the server

[
    \"hello\",
    \"world\"
]

is being parsed into a 2d array by this ngResource service

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2条回答

盖世英雄少女心

2020-11-29 00:35

I have been struggling with this as well. Here is my solution by adjusting the service slighly by using query

var app = angular.module('testApp', ['ngResource']);

app.factory('Name', function($resource, $sce) {
  var path = "test.json";

  return $resource(path, {}, {
    query: {
      method: 'GET',
      isArray: false
    }
  })
});

app.controller('testController', function($scope, Name) {
  $scope.result;

  $scope.getResult = function() {
    Name.query(function(data) {
      $scope.result = data;
    });
  };

  $scope.getResult();
});

HTML:

<!DOCTYPE html>
<html ng-app="testApp">

<head>

  <link href="style.css" rel="stylesheet" />
  <script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.3.14/angular.min.js"></script>
  <script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.3.14/angular-resource.min.js"></script>

  <script src="script.js"></script>
</head>

<body ng-controller="testController">
  <h1>{{result.surname}}</h1>

</body>

</html>

and the JSON file:

{
    "name": "Homer",
    "surname":  "Simpson",
    "Town": "Springfield"
}

and also working Plunker if interested: http://plnkr.co/edit/SwqlZyqZ4zfcpaLxaf39

Hope this help someone ...

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旧时难觅i

2020-11-29 00:36
TLDR; ngResource expects an object or an array of objects in your response.

When isArray is set to true in the list of actions, the ngResource module iterates over each item received in the response and it creates a new instance of a Resource. To do this Angular performs a deep copy between the item received and the Resource class, which gives us an object with special methods ($save, $delete and so on)

Check the source here.

Internally angular uses angular.copy to perform the deep copy and this function only operates with objects and arrays, when we pass a string, it will treat it like an object.

Strings in JS can behave as arrays by providing sequential access to each character. angular.copy will produce the following when passed a string
```
angular.copy('hi',{})   => {0:'h', 1:'i'}
```
Each character becomes a value in an object, with its index set as the key. ngResource will provide a resource with properties 0 and 1.

Your choices are:

Use the lower level $http service
```
$http.get('/res').success(function(data){
  $scope.test = data;
});
```
Return an array of objects in your json response
```
[{'data': "hello"}, {'data': "world"}] 
```
Intercept the response and change your data

If you cannot modify the data the server sends back and want to use ngResource you will need to transform the response. Read how to do it here
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One dimensional array of strings being parsed to 2d by angular resource

Use the lower level $http service

Return an array of objects in your json response

Intercept the response and change your data