从 mongoose 实体解析 JSON

Posted 2023-03-11

【中文标题】从 mongoose 实体解析 JSON

【英文标题】：parse JSON from the mongoose entity

【发布时间】：2015-04-18 22:32:57

【问题描述】：

我有以下条目：

var mongoose = require('mongoose'),
    Schema = mongoose.Schema;

var ProjectTemplateSchema = new Schema(

    title: 
        type: String
    ,

    connectionsString: 
        type: String
    ,

    creator: 
        type: Schema.ObjectId,
        ref: 'User'
    

)

mongoose.model('ProjectTemplate', ProjectTemplateSchema)

当用户请求项目模板列表时，我会渲染一个 ejs 页面：

exports.renderTemplate = function(req, res) 
    ProjectTemplate.find().sort('creator').populate('creator', 'firstName lastName fullName').exec(function(err, projectTemplates) 
        if (err) 
            return res.status(400).send(
                message: getErrorMessage(err)
            )
        
        else 

            //TODO: NOT WORKING
            res.render('projectTemplate', 
                title: 'project template page',
                user: JSON.stringify(req.user),
                projectTemplates: JSON.stringify(projectTemplates)
            )
        
    )

然后在 ejs 文件中，我简单地创建一个变量来存储 json 字符串

<% include common/header %>

<% include common/canvas %>

<script type="text/javascript" src="/public/projectTemplate/projectTemplate.client.module.js"></script>
<script type="text/javascript" src="/public/projectTemplate/projectTemplate.client.controller.js"></script>


<script>
    var projectTemplates = "<%- projectTemplates %>"
</script>

<% include common/footer %>

在客户端，我得到了这个结果：

var projectTemplates = "["_id":"54dc83fc5c2c43bcf371580c","connectionsString":"[]","creator":"_id":"54dc1771d87343b3fe78e279","fullName":"undefined undefined","id":"54dc1771d87343b3fe78e279","title":"farhser","__v":0,"_id":"54e14ad2ec168f7c724d7c94","connectionsString":"[]","creator":"_id":"54dc1771d87343b3fe78e279","fullName":"undefined undefined","id":"54dc1771d87343b3fe78e279","title":"asdfqwe","__v":0,"_id":"54dc186b4db5b64654ed20b3","connectionsString":"[\"sourceTaskIndex\":0,\"targetTaskIndex\":1,\"sourceTaskIndex\":0,\"targetTaskIndex\":2,\"sourceTaskIndex\":2,\"targetTaskIndex\":3]","creator":"_id":"54dc1771d87343b3fe78e279","fullName":"undefined undefined","id":"54dc1771d87343b3fe78e279","title":"project b","__v":0,"_id":"54dc3a995cb1efb17729ba14","connectionsString":"[\"sourceTaskIndex\":0,\"targetTaskIndex\":1,\"sourceTaskIndex\":0,\"targetTaskIndex\":2,\"sourceTaskIndex\":0,\"targetTaskIndex\":1]","creator":"_id":"54dc1771d87343b3fe78e279","fullName":"undefined undefined","id":"54dc1771d87343b3fe78e279","title":"dfiweoif3","__v":0,"_id":"54dc1780d87343b3fe78e27a","connectionsString":"[\"sourceTaskIndex\":0,\"targetTaskIndex\":2,\"sourceTaskIndex\":0,\"targetTaskIndex\":2,\"sourceTaskIndex\":2,\"targetTaskIndex\":3,\"sourceTaskIndex\":0,\"targetTaskIndex\":2,\"sourceTaskIndex\":0,\"targetTaskIndex\":2,\"sourceTaskIndex\":2,\"targetTaskIndex\":3,\"sourceTaskIndex\":0,\"targetTaskIndex\":2,\"sourceTaskIndex\":0,\"targetTaskIndex\":2,\"sourceTaskIndex\":2,\"targetTaskIndex\":3,\"sourceTaskIndex\":0,\"targetTaskIndex\":1]","creator":"_id":"54dc1771d87343b3fe78e279","fullName":"undefined undefined","id":"54dc1771d87343b3fe78e279","title":"project a","__v":0,"_id":"54dc2dbc8ea46d216bf5b19e","connectionsString":"[\"sourceTaskIndex\":0,\"targetTaskIndex\":1,\"sourceTaskIndex\":0,\"targetTaskIndex\":2,\"sourceTaskIndex\":2,\"targetTaskIndex\":3,\"sourceTaskIndex\":1,\"targetTaskIndex\":3,\"sourceTaskIndex\":0,\"targetTaskIndex\":1,\"sourceTaskIndex\":0,\"targetTaskIndex\":2,\"sourceTaskIndex\":2,\"targetTaskIndex\":3,\"sourceTaskIndex\":1,\"targetTaskIndex\":3]","creator":"_id":"54dc1771d87343b3fe78e279","fullName":"undefined undefined","id":"54dc1771d87343b3fe78e279","title":"project c","__v":0,"_id":"54dc3d74577fa3167bc7962f","connectionsString":"[\"sourceTaskIndex\":0,\"targetTaskIndex\":1,\"sourceTaskIndex\":0,\"targetTaskIndex\":2]","creator":"_id":"54dc1771d87343b3fe78e279","fullName":"undefined undefined","id":"54dc1771d87343b3fe78e279","title":"projd","__v":0,"_id":"54dc3f88993a2a3b7d48515f","connectionsString":"[\"sourceTaskIndex\":0,\"targetTaskIndex\":1,\"sourceTaskIndex\":0,\"targetTaskIndex\":2]","creator":"_id":"54dc1771d87343b3fe78e279","fullName":"undefined undefined","id":"54dc1771d87343b3fe78e279","title":"project f","__v":0,"_id":"54dc4021e3c1fd0a7ef51de3","connectionsString":"[\"sourceTaskIndex\":0,\"targetTaskIndex\":2,\"sourceTaskIndex\":0,\"targetTaskIndex\":1]","creator":"_id":"54dc1771d87343b3fe78e279","fullName":"undefined undefined","id":"54dc1771d87343b3fe78e279","title":"project g","__v":0,"_id":"54dc48d68eec924986764c16","connectionsString":"[\"sourceTaskIndex\":0,\"targetTaskIndex\":1,\"sourceTaskIndex\":0,\"targetTaskIndex\":2]","creator":"_id":"54dc1771d87343b3fe78e279","fullName":"undefined undefined","id":"54dc1771d87343b3fe78e279","title":"proj h","__v":0,"_id":"54dc586ab68a07d89ab4a395","connectionsString":"[\"sourceTaskIndex\":0,\"targetTaskIndex\":1,\"sourceTaskIndex\":0,\"targetTaskIndex\":2,\"sourceTaskIndex\":2,\"targetTaskIndex\":3]","creator":"_id":"54dc1771d87343b3fe78e279","fullName":"undefined undefined","id":"54dc1771d87343b3fe78e279","title":"project z","__v":0,"_id":"54dc595987802b4b9c07a9dd","connectionsString":"[\"sourceTaskIndex\":0,\"targetTaskIndex\":1,\"sourceTaskIndex\":0,\"targetTaskIndex\":2]","creator":"_id":"54dc1771d87343b3fe78e279","fullName":"undefined undefined","id":"54dc1771d87343b3fe78e279","title":"bsdf","__v":0,"_id":"54dc5ad7f8735d119ffb05b5","connectionsString":"[\"sourceTaskIndex\":0,\"targetTaskIndex\":1]","creator":"_id":"54dc1771d87343b3fe78e279","fullName":"undefined undefined","id":"54dc1771d87343b3fe78e279","title":"bfgfn","__v":0,"_id":"54dc5b784fca6552a17e3ff5","connectionsString":"[\"sourceTaskIndex\":0,\"targetTaskIndex\":1]","creator":"_id":"54dc1771d87343b3fe78e279","fullName":"undefined undefined","id":"54dc1771d87343b3fe78e279","title":"nfdgh","__v":0,"_id":"54dc651a95f19d97be10f32e","connectionsString":"[\"sourceTaskIndex\":0,\"targetTaskIndex\":1]","creator":"_id":"54dc1771d87343b3fe78e279","fullName":"undefined undefined","id":"54dc1771d87343b3fe78e279","title":"bafd","__v":0,"_id":"54dc80185c2c43bcf3715804","connectionsString":"[\"sourceTaskIndex\":0,\"targetTaskIndex\":1,\"sourceTaskIndex\":0,\"targetTaskIndex\":2]","creator":"_id":"54dc1771d87343b3fe78e279","fullName":"undefined undefined","id":"54dc1771d87343b3fe78e279","title":"project 2","__v":0,"_id":"54dc845b016dfd41f868c4a2","connectionsString":"[\"sourceTaskIndex\":0,\"targetTaskIndex\":1,\"sourceTaskIndex\":2,\"targetTaskIndex\":3,\"sourceTaskIndex\":0,\"targetTaskIndex\":2]","creator":"_id":"54dc1771d87343b3fe78e279","fullName":"undefined undefined","id":"54dc1771d87343b3fe78e279","title":"sgjsthe","__v":0,"_id":"54e192b70c8c3565b19fcacb","connectionsString":"","creator":"_id":"54dc1771d87343b3fe78e279","fullName":"undefined undefined","id":"54dc1771d87343b3fe78e279","title":"qherwe","__v":0,"_id":"54e14ae0ec168f7c724d7c96","connectionsString":"[\"sourceTaskIndex\":0,\"targetTaskIndex\":1]","creator":"_id":"54dc1771d87343b3fe78e279","fullName":"undefined undefined","id":"54dc1771d87343b3fe78e279","title":"fawe","__v":0,"_id":"54e14ed9726d809b767fa011","connectionsString":"[\"sourceTaskIndex\":0,\"targetTaskIndex\":1]","creator":"_id":"54dc1771d87343b3fe78e279","fullName":"undefined undefined","id":"54dc1771d87343b3fe78e279","title":"safaew","__v":0,"_id":"54e1bb1903d30d63d54790e6","connectionsString":"","creator":"_id":"54dc1771d87343b3fe78e279","fullName":"undefined undefined","id":"54dc1771d87343b3fe78e279","title":"fahwrewe","__v":0,"_id":"54e1bb8670c551ddd5239389","connectionsString":"","creator":"_id":"54dc1771d87343b3fe78e279","fullName":"undefined undefined","id":"54dc1771d87343b3fe78e279","title":"hjfyjt","__v":0,"_id":"54e1c1a29ada1c7bd914121b","connectionsString":"[\"sourceTaskIndex\":1,\"targetTaskIndex\":0]","creator":"_id":"54dc1771d87343b3fe78e279","fullName":"undefined undefined","id":"54dc1771d87343b3fe78e279","title":"hfgtjdr","__v":0,"_id":"54e1c5e6a3c63bbee0a21ce7","connectionsString":"[\"sourceTaskIndex\":0,\"targetTaskIndex\":1]","creator":"_id":"54dc1771d87343b3fe78e279","fullName":"undefined undefined","id":"54dc1771d87343b3fe78e279","title":"fjdtj","__v":0,"_id":"54e1c62799377201e1b87850","connectionsString":"[\"sourceTaskIndex\":0,\"targetTaskIndex\":1]","creator":"_id":"54dc1771d87343b3fe78e279","fullName":"undefined undefined","id":"54dc1771d87343b3fe78e279","title":"arhsrt","__v":0,"_id":"54e1c7f5f03fdbb9e26ced04","connectionsString":"[\"sourceTaskIndex\":0,\"targetTaskIndex\":1]","creator":"_id":"54dc1771d87343b3fe78e279","fullName":"undefined undefined","id":"54dc1771d87343b3fe78e279","title":"dhehert","__v":0,"_id":"54e1cbf4e041fb00e7da2b1f","connectionsString":"[\"sourceTaskIndex\":0,\"targetTaskIndex\":1]","creator":"_id":"54dc1771d87343b3fe78e279","fullName":"undefined undefined","id":"54dc1771d87343b3fe78e279","title":"proja","__v":0]"

如果我尝试<%= %>，我有这个：

var projectTemplates = "["_id":"54dc83fc5c2c43bcf371580c","connectionsString":"[]","creator":"_id":"54dc1771d87343b3fe78e279","fullName":"undefined undefined","id":"54dc1771d87343b3fe78e279","title":"farhser","__v":0,"_id":"54e14ad2ec168f7c724d7c94","connectionsString":"[]","creator":"_id":"54dc1771d87343b3fe78e279","fullName":"undefined undefined","id":"54dc1771d87343b3fe78e279","title":"asdfqwe","__v":0,"_id":"54dc186b4db5b64654ed20b3","connectionsString":"[\"sourceTaskIndex\":0,\"targetTaskIndex\":1,\"sourceTaskIndex\":0,\"targetTaskIndex\":2,\"sourceTaskIndex\":2,\"targetTaskIndex\":3]","creator":"_id":"54dc1771d87343b3fe78e279","fullName":"undefined undefined","id":"54dc1771d87343b3fe78e279","title":"project b","__v":0,"_id":"54dc3a995cb1efb17729ba14","connectionsString":"[\"sourceTaskIndex\":0,\"targetTaskIndex\":1,\"sourceTaskIndex\":0,\"targetTaskIndex\":2,\"sourceTaskIndex\":0,\"targetTaskIndex\":1]","creator":"_id":"54dc1771d87343b3fe78e279","fullName":"undefined undefined","id":"54dc1771d87343b3fe78e279","title":"dfiweoif3","__v":0,"_id":"54dc1780d87343b3fe78e27a","connectionsString":"[\"sourceTaskIndex\":0,\"targetTaskIndex\":2,\"sourceTaskIndex\":0,\"targetTaskIndex\":2,\"sourceTaskIndex\":2,\"targetTaskIndex\":3,\"sourceTaskIndex\":0,\"targetTaskIndex\":2,\"sourceTaskIndex\":0,\"targetTaskIndex\":2,\"sourceTaskIndex\":2,\"targetTaskIndex\":3,\"sourceTaskIndex\":0,\"targetTaskIndex\":2,\"sourceTaskIndex\":0,\"targetTaskIndex\":2,\"sourceTaskIndex\":2,\"targetTaskIndex\":3,\"sourceTaskIndex\":0,\"targetTaskIndex\":1]","creator":"_id":"54dc1771d87343b3fe78e279","fullName":"undefined undefined","id":"54dc1771d87343b3fe78e279","title":"project a","__v":0,"_id":"54dc2dbc8ea46d216bf5b19e","connectionsString":"[\"sourceTaskIndex\":0,\"targetTaskIndex\":1,\"sourceTaskIndex\":0,\"targetTaskIndex\":2,\"sourceTaskIndex\":2,\"targetTaskIndex\":3,\"sourceTaskIndex\":1,\"targetTaskIndex\":3,\"sourceTaskIndex\":0,\"targetTaskIndex\":1,\"sourceTaskIndex\":0,\"targetTaskIndex\":2,\"sourceTaskIndex\":2,\"targetTaskIndex\":3,\"sourceTaskIndex\":1,\"targetTaskIndex\":3]","creator":"_id":"54dc1771d87343b3fe78e279","fullName":"undefined undefined","id":"54dc1771d87343b3fe78e279","title":"project c","__v":0,"_id":"54dc3d74577fa3167bc7962f","connectionsString":"[\"sourceTaskIndex\":0,\"targetTaskIndex\":1,\"sourceTaskIndex\":0,\"targetTaskIndex\":2]","creator":"_id":"54dc1771d87343b3fe78e279","fullName":"undefined undefined","id":"54dc1771d87343b3fe78e279","title":"projd","__v":0,"_id":"54dc3f88993a2a3b7d48515f","connectionsString":"[\"sourceTaskIndex\":0,\"targetTaskIndex\":1,\"sourceTaskIndex\":0,\"targetTaskIndex\":2]","creator":"_id":"54dc1771d87343b3fe78e279","fullName":"undefined undefined","id":"54dc1771d87343b3fe78e279","title":"project f","__v":0,"_id":"54dc4021e3c1fd0a7ef51de3","connectionsString":"[\"sourceTaskIndex\":0,\"targetTaskIndex\":2,\"sourceTaskIndex\":0,\"targetTaskIndex\":1]","creator":"_id":"54dc1771d87343b3fe78e279","fullName":"undefined undefined","id":"54dc1771d87343b3fe78e279","title":"project g","__v":0,"_id":"54dc48d68eec924986764c16","connectionsString":"[\"sourceTaskIndex\":0,\"targetTaskIndex\":1,\"sourceTaskIndex\":0,\"targetTaskIndex\":2]","creator":"_id":"54dc1771d87343b3fe78e279","fullName":"undefined undefined","id":"54dc1771d87343b3fe78e279","title":"proj h","__v":0,"_id":"54dc586ab68a07d89ab4a395","connectionsString":"[\"sourceTaskIndex\":0,\"targetTaskIndex\":1,\"sourceTaskIndex\":0,\"targetTaskIndex\":2,\"sourceTaskIndex\":2,\"targetTaskIndex\":3]","creator":"_id":"54dc1771d87343b3fe78e279","fullName":"undefined undefined","id":"54dc1771d87343b3fe78e279","title":"project z","__v":0,"_id":"54dc595987802b4b9c07a9dd","connectionsString":"[\"sourceTaskIndex\":0,\"targetTaskIndex\":1,\"sourceTaskIndex\":0,\"targetTaskIndex\":2]","creator":"_id":"54dc1771d87343b3fe78e279","fullName":"undefined undefined","id":"54dc1771d87343b3fe78e279","title":"bsdf","__v":0,"_id":"54dc5ad7f8735d119ffb05b5","connectionsString":"[\"sourceTaskIndex\":0,\"targetTaskIndex\":1]","creator":"_id":"54dc1771d87343b3fe78e279","fullName":"undefined undefined","id":"54dc1771d87343b3fe78e279","title":"bfgfn","__v":0,"_id":"54dc5b784fca6552a17e3ff5","connectionsString":"[\"sourceTaskIndex\":0,\"targetTaskIndex\":1]","creator":"_id":"54dc1771d87343b3fe78e279","fullName":"undefined undefined","id":"54dc1771d87343b3fe78e279","title":"nfdgh","__v":0,"_id":"54dc651a95f19d97be10f32e","connectionsString":"[\"sourceTaskIndex\":0,\"targetTaskIndex\":1]","creator":"_id":"54dc1771d87343b3fe78e279","fullName":"undefined undefined","id":"54dc1771d87343b3fe78e279","title":"bafd","__v":0,"_id":"54dc80185c2c43bcf3715804","connectionsString":"[\"sourceTaskIndex\":0,\"targetTaskIndex\":1,\"sourceTaskIndex\":0,\"targetTaskIndex\":2]","creator":"_id":"54dc1771d87343b3fe78e279","fullName":"undefined undefined","id":"54dc1771d87343b3fe78e279","title":"project 2","__v":0,"_id":"54dc845b016dfd41f868c4a2","connectionsString":"[\"sourceTaskIndex\":0,\"targetTaskIndex\":1,\"sourceTaskIndex\":2,\"targetTaskIndex\":3,\"sourceTaskIndex\":0,\"targetTaskIndex\":2]","creator":"_id":"54dc1771d87343b3fe78e279","fullName":"undefined undefined","id":"54dc1771d87343b3fe78e279","title":"sgjsthe","__v":0,"_id":"54e192b70c8c3565b19fcacb","connectionsString":"","creator":"_id":"54dc1771d87343b3fe78e279","fullName":"undefined undefined","id":"54dc1771d87343b3fe78e279","title":"qherwe","__v":0,"_id":"54e14ae0ec168f7c724d7c96","connectionsString":"[\"sourceTaskIndex\":0,\"targetTaskIndex\":1]","creator":"_id":"54dc1771d87343b3fe78e279","fullName":"undefined undefined","id":"54dc1771d87343b3fe78e279","title":"fawe","__v":0,"_id":"54e14ed9726d809b767fa011","connectionsString":"[\"sourceTaskIndex\":0,\"targetTaskIndex\":1]","creator":"_id":"54dc1771d87343b3fe78e279","fullName":"undefined undefined","id":"54dc1771d87343b3fe78e279","title":"safaew","__v":0,"_id":"54e1bb1903d30d63d54790e6","connectionsString":"","creator":"_id":"54dc1771d87343b3fe78e279","fullName":"undefined undefined","id":"54dc1771d87343b3fe78e279","title":"fahwrewe","__v":0,"_id":"54e1bb8670c551ddd5239389","connectionsString":"","creator":"_id":"54dc1771d87343b3fe78e279","fullName":"undefined undefined","id":"54dc1771d87343b3fe78e279","title":"hjfyjt","__v":0,"_id":"54e1c1a29ada1c7bd914121b","connectionsString":"[\"sourceTaskIndex\":1,\"targetTaskIndex\":0]","creator":"_id":"54dc1771d87343b3fe78e279","fullName":"undefined undefined","id":"54dc1771d87343b3fe78e279","title":"hfgtjdr","__v":0,"_id":"54e1c5e6a3c63bbee0a21ce7","connectionsString":"[\"sourceTaskIndex\":0,\"targetTaskIndex\":1]","creator":"_id":"54dc1771d87343b3fe78e279","fullName":"undefined undefined","id":"54dc1771d87343b3fe78e279","title":"fjdtj","__v":0,"_id":"54e1c62799377201e1b87850","connectionsString":"[\"sourceTaskIndex\":0,\"targetTaskIndex\":1]","creator":"_id":"54dc1771d87343b3fe78e279","fullName":"undefined undefined","id":"54dc1771d87343b3fe78e279","title":"arhsrt","__v":0,"_id":"54e1c7f5f03fdbb9e26ced04","connectionsString":"[\"sourceTaskIndex\":0,\"targetTaskIndex\":1]","creator":"_id":"54dc1771d87343b3fe78e279","fullName":"undefined undefined","id":"54dc1771d87343b3fe78e279","title":"dhehert","__v":0,"_id":"54e1cbf4e041fb00e7da2b1f","connectionsString":"[\"sourceTaskIndex\":0,\"targetTaskIndex\":1]","creator":"_id":"54dc1771d87343b3fe78e279","fullName":"undefined undefined","id":"54dc1771d87343b3fe78e279","title":"proja","__v":0]"

两个json都坏了。当我尝试解析 JSON 时应用程序崩溃

angular.module('projectTemplate').controller('ProjectTemplateController', ['$scope', '$routeParams', '$location', 'Authentication', 'ProjectTemplate',
    function($scope, $routeParams, $location, Authentication, ProjectTemplate) 

        $scope.authentication = Authentication;

        //TODO: NOT WORKING!!!
        $scope.projectTemplates = JSON.parse(projectTemplates)

【问题讨论】：

检查$query.populate(..)的语法，我觉得有问题。

你通常可以解析出 "但问题在于您的连接字符串已经是 JSON 字符串化字符串，因此当您再次对其进行字符串化时，您会得到：\&quote;哪个javascript不喜欢。

【参考方案1】：

由于您使用的是 Angular，您可以尝试通过 ngResource 传递变量

ProjectTemplate.find().sort('creator').populate('creator', 'firstName lastName fullName').exec(function(err, projectTemplates) 
    if (err) 
        return res.status(400).send(
            message: getErrorMessage(err)
        )
    
    else 
        projectTemplates = projectTemplates.map(function(projectTemplate) 
            return projectTemplate.toObject();
        )
        res.json(projectTemplates)
    
)

在你的角度控制器的开头，这样做

    $scope.projectTemplates = ProjectTemplate.query()

别忘了添加 ProjectTemplate 资源/服务

projectTemplate.factory('ProjectTemplate', ['$resource', function($resource) 
    return $resource('/projectTemplate/api/:projectTemplateId', 
        projectTemplateId: '@_id'
    , 
        update: 
            method: 'PUT'
        
    )
])

稍微扭曲一下你的服务器路由，将 projectTemplate 数据与视图模板的渲染分开请求（这是一个更好的设计）

【讨论】：

它有效。我认为问题在于猫鼬模型的 toObject() 而不是 toJSON()