如果数据是新的就添加，如果数据是不同的就更新

我试图更新数据，而不是添加(创建)一个新的数据时，图像被改变(图像是在base64)

我也跟着:http://jsfiddle.net/4Zeuk/12/就像我下面想做的，但我已经尽力了，但它更新不起作用。没有错误。

只是为了你的信息，我使用的是ngCropper。https://github.com/koorgoo/ngCropper

EDIT:更新控制器代码

角代码

      app.controller("ProductAddCtrl", function($scope, $timeout, $resource, Product, Products, $location, Cropper) {
        $scope.product = {item_name: '', price: '', category: ''}
        var file, data;
        $scope.saveImage = function(dataUrl) {
          if (!file || !data) return;
           if ($scope.product.currentImage){
              Cropper.crop(file, data).then(Cropper.encode).then(function(dataUrl) {
                ($scope.preview || ($scope.preview = {})).dataUrl = dataUrl;
                  Product.update({id: $scope.product.id }, {product: { item_name: $scope.product.item_name, category: $scope.product.category, price: $scope.product.price, item_image: dataUrl, filename: file.name}},function(){
            //  $location.path('/');
                console.log($scope.product)
                }, function(error) {
                  console.log(error)
                });
              });
            } else {
              Cropper.crop(file, data).then(Cropper.encode).then(function(dataUrl) {
                ($scope.preview || ($scope.preview = {})).dataUrl = dataUrl;
                  Products.create({ product: { item_name: $scope.product.item_name, price: $scope.product.price, item_image: dataUrl, filename: file.name }}, function(){
                  // $location.path('/');
                  }, function(error){
                    console.log(error)
                  });
              })
            }
          }
          $scope.onChange = function() {
            if ($scope.product.currentImage) {
              $scope.product.item_image = $scope.product.currentImage.item_image;
              $scope.product.filename = $scope.product.currentImage.filename;
            } else {
              $scope.product = {};
            }
          }
  });

Angular模板文件

<div class="content-push">
  <input type="file" onchange="angular.element(this).scope().onFile(this.files[0])" ng-class="{'has-error' : productForm.item_image.$invalid}" ng-model="product.currentImage" ng-change="onChange" required>
    <br />
    <div ng-if="dataUrl" class="img-container">
      <img ng-if="dataUrl" ng-src="{{dataUrl}}" width="300" height="300"
          ng-cropper
          ng-cropper-proxy="cropperProxy"
          ng-cropper-show="showEvent"
          ng-cropper-hide="hideEvent"
          ng-cropper-options="options">
    </div>
    <br />
      <button ng-click="preview()" class="btn btn-success">Show preview</button>
      <button ng-click="zoomin()" class="btn btn-default">Zoom In</button>
      <button ng-click="zoomout()" class="btn btn-default">Zoom Out</button>
      <!-- <button ng-click="saveImage()" class="btn btn-default">Save</button> -->
      <input type="submit" value="{{ product.currentImage.item_image ? 'Update' : 'Save' }}", class="btn btn-default" ng-click="saveImage()">
      <div class="preview-container">
        <img ng-if="preview.dataUrl" ng-src="{{preview.dataUrl}}" width="100" height: "100">
      </div>
      <select name="sellCategory" class="form-control" id="sellCategory" ng-model="product.category" required>
        <option ng-repeat="option in categories.availableCategories" value="{{option.category}}">{{option.name}}</option>
      </select>
      <input type="text" ng-model="product.item_name" class="form-control" placeholder="Item Name" required>
      <input type="text" ng-model="product.price" class="form-control" placeholder="Item Price" required>
</div>