AngularJS ng-table 无法将属性"$data"设置为 null

Question

我刚刚开始使用 ng-table，我正在尝试通过 jasmine 单元测试来测试它（不确定这是否是测试我的控制器的最佳方式），但我不断遇到此错误;

TypeError: Cannot set property '$data' of null
    at project/vendor/assets/javascripts/ng-table-0.3.1/ng-table.src.js:396:55
    at C (project/vendor/assets/javascripts/angular-min.js:92:375)
    at project/vendor/assets/javascripts/angular-min.js:94:28
    at h.$eval (project/vendor/assets/javascripts/angular-min.js:102:308)
    at h.$digest (project/vendor/assets/javascripts/angular-min.js:100:50)
    at h.$apply (project/vendor/assets/javascripts/angular-min.js:103:100)
    at f (project/vendor/assets/javascripts/angular-min.js:67:98)
    at handleResponse (project/vendor/assets/javascripts/angular-mocks.js:1160:9)
    at Function.$httpBackend.flush (project/vendor/assets/javascripts/angular-mocks.js:1491:26)
    at null.<anonymous> (project/spec/javascripts/unit/debtors_controller_spec.js.js:50:24)

这是我在控制器中设置 ngTableParams 的地方

  # Setup ng-table with defaults and data
  $scope.tableParams = new ngTableParams({
    page: 1,
    count: 10,
    sorting: { code: 'asc'}
  }, {
    # data is created by ngTableParams
    total: 0,
    # ng-table will ask for updated data, this is where it gets it from.
    getData: ($defer, params) ->
      # Go get a list of debtors
      Debtor.query {}, (data) ->
        # Once successfully returned from the server with my data process it.
        params.total(data.length)
        # Filter
        filteredData = (if params.filter then $filter('filter')(data, params.filter()) else data)
        # Sort
        orderedData = (if params.sorting then $filter('orderBy')(filteredData, params.orderBy()) else data)
        # Paginate
        $defer.resolve(orderedData.slice((params.page() - 1) * params.count(), params.page() * params.count()))
  })

这是茉莉花测试

  # ================================================================================
  # Delete tests
  # ================================================================================
  describe "destroy", ->
    beforeEach(inject ( ($controller, $rootScope, $location, $state, $httpBackend) ->
      ctrl = $controller('DebtorsController', {
        $scope: @scope,
        $location: $location
      })
    ))
    it "gets new listing", ->
      @scope.debtors = [{id: 1, name: "Good guys"}, {id: 2, name: "John"}]
      @httpBackend.whenDELETE('/clients/1').respond(200)
      @httpBackend.whenGET('/debtors').respond(200,  [{name: "John"}])
      @scope.destroy(1)
      @httpBackend.flush()
      expect(@scope.debtors[0].name).toEqual('John')

这是我删除的代码（有效）

  # --------------------------------------------------------------------------------
  # Delete
  # --------------------------------------------------------------------------------
  $scope.destroy = (id) ->
    Client.delete
      id: id
    , (response) ->             # Success
      flash("notice", "Client deleted", 2000)
      $scope.tableParams.reload() # Reload ng-table data, which will get a new listing from the server.
    , (response) ->             # Failure

Answer 1

你能在控制器中显示初始化ngTableParams的代码吗？

问题是ng-table使用ngTableController来设置ngTableParams的$scope。由于您正在进行单元测试，因此不会有ngTableController因此$scope ngTableParams将为空。您应该在单元测试中手动设置ngTableParams $scope。尝试类似于这个JS的东西（真的很不喜欢coffeescript，所以要根据你的需求转换）：

beforeEach(inject(function ($controller, $rootScope) {
            scope = $rootScope.$new();
            ctrl = $controller('DebtorsController', {
                $scope: scope,
                $location: $location
            });
            scope.tableParams.settings().$scope = scope;
        }));

假设您在初始化ngTableParams的控制器中有类似以下内容的内容：

$scope.tableParams = new ngTableParams({
    page: 1,            // show first page
    count: 10           // count per page
}, {
    total: data.length, // length of data
    getData: function($defer, params) {
        $defer.resolve(data.slice((params.page() - 1) * params.count(), params.page() * params.count()));
    }
});