MEAN堆栈：如何更新功能的结果数据库？ [英] MEAN Stack: How to update a function's result to the database?

问题描述

我有一个评论系统，我需要的upvotes存储在数据库中，只要点击该图标给予好评。我具备的功能数量的增加，但只要我刷新它，它又说0。我如何直接存储到数据库？
这里是code：

在 ang.js 在公共/ JavaScript的的目录：

  VAR应用= angular.module（'peopleComments'，['ui.router']）;
app.factory（'意见'，['$ HTTP'，函数（$ HTTP）{
变种C = {
注释：[]
};//装载与GETALL现有的所有评论（）
c.getAll =功能（）{
返回$ http.get（'/意见）。成功（功能（数据）{
    angular.copy（数据，c.comments）;
}）;
};//这对于更新数据库中创建新的评论功能
c.create =功能（评论）{
返回$ http.post（'/评论，评论）.success（功能（数据）{
c.comments.push（数据）;
}）;};
返回℃;
}]）;app.controller（'基地'，[
'$范围'，'意见'，函数（$范围，评论）{
  $ scope.comments = comments.comments;    $ scope.addComment =功能（）{
        如果（！$ scope.username || $ scope.username ==''）{$ scope.username ='无名氏';}
        如果{回报;}（$ scope.contents || $ scope.contents ==''！）
        comments.create（{
            用户名：$ scope.username，
            内容：$ scope.contents，
            }）;
        $ scope.username ='';
        $ scope.contents ='';
    }
$ scope.increaseUpvotes =功能（评论）{//功能，更新upvotes
  comment.upvotes + = 1;
}}]）;
 

解决方案

您需要创建您服务 c.update（评论）方法，它要评论更新，然后调用你的API更新给予好评按钮被点击时的注释在对应的 $ http.put（）方法。

更新：还有一个潜在的问题 - 如果你不是专门创建一个 comment.upvotes 属性，默认情况下那么你将其设置为0 comment.upvotes + = 1 可能会被加一空或未定义并没有真正增加一个。

I'm having a commenting system and I need to store the upvotes in the database whenever the upvote icon is clicked. The function I have increases the number but as soon as I refresh it, it says 0 again. How do I store it directly to the database? Here is the code:

In the ang.js in the public/javascripts directory:

var app=angular.module('peopleComments',['ui.router']);
app.factory('comments',['$http', function($http){
var c={
comments:[]
};

//loading all existing comments with getAll()
c.getAll=function(){
return $http.get('/comments').success(function(data){
    angular.copy(data, c.comments);
});
};

//function which creates the new comments for updating in the database
c.create = function(comment) {
return $http.post('/comments', comment).success(function(data){
c.comments.push(data);
});};
return c;
}]);

app.controller('Base',[
'$scope','comments',function($scope,comments){
  $scope.comments=comments.comments;

    $scope.addComment=function(){
        if(!$scope.username||$scope.username==''){$scope.username='Anonymous';}
        if(!$scope.contents||$scope.contents==''){return;}
        comments.create({
            username: $scope.username,
            contents: $scope.contents,
            });
        $scope.username='';
        $scope.contents='';
    }
$scope.increaseUpvotes=function(comment){   //function which updates the upvotes
  comment.upvotes+=1;
}

}]);

解决方案

You need to create a c.update(comment) method in your service that takes a comment to update and then calls a corresponding $http.put() method in your API to update the comment when the upvote button is clicked.

Update: One more potential issue - if you are not specifically creating a comment.upvotes property and setting it to 0 by default then your comment.upvotes += 1 might be adding one to null or undefined and not really adding one.

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