node.js 检查数组是否包含 angularjs 中的值
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Check if array contains value in angularjs
提问by vitalym
On client side I have $scope.loggedInUser, which refers to mongoose user schema. Another schema I'm using is a conversation schema. Every user can join conversation, in that case he will be added to conversation.participants array, which is defined like that:
在客户端，我有 $scope.loggedInUser，它指的是 mongoose 用户架构。我正在使用的另一个模式是对话模式。每个用户都可以加入对话，在这种情况下，他将被添加到conversation.participants 数组，其定义如下：
var conversationsSchema = new Schema({
participants: {type: Array, default: []}
});
I want to display only conversation with current user (i.e. loggedInUser) in participants array. I tried
我只想在参与者数组中显示与当前用户（即已登录用户）的对话。我试过
ng-repeat="conversation in conversations" ng-if="conversation.participants.indexOf(logged_in_user) > -1"
but I dodn't see any. How can I check if element exists in array in ng-if (or generally in angular) correctly?
但我没有看到。如何正确检查 ng-if（或通常为 angular）数组中是否存在元素？
采纳答案by Miniver Cheevy
You could use a filterlike
你可以使用像这样的过滤器
ng-repeat="conversation in conversations | filter:logged_in_user"
I'm not sure if the view side implementation will dig into the nested collection, you might have to filter it in the controller
我不确定视图端实现是否会深入到嵌套集合中，您可能需要在控制器中对其进行过滤
filteredConversations = $filter(this.conversations,
{name:logged_in_user},doFiltering);
where do filtering is a method to do the actual work, something like:
其中 do 过滤是一种进行实际工作的方法，例如：
function (actual, expected) {
return actual.participants.indexOf(expected) > -1;
}
be sure to inject $filter into your controller if you do it controller side.
如果您在控制器端执行此操作，请务必将 $filter 注入您的控制器。
