如何使用附加数据更新现有对象
该项目是使用 nodejs 和 mongoose 创建的。我要做的是使用附加数据更新现有模型（在这种情况下是注释）。
这是模型及其方法：
const bugSchema = new Schema({
title: {
type: String,
required: true
},
description: {
type: String,
required: true
},
date: {
type: String,
required: true
},
time: {
type: String,
required: true
},
assignedTo: {
type: String,
required: true
},
assignedBy: {
type: String,
required: true
},
status: {
type: String,
required: true
},
priority: {
type: String,
required: true
},
comments: {
comment:[
{
user:{
type: String,
required: true
},
content: {
type: String,
required: true
}
}
]
}
});
bugSchema.methods.addComment = function(comment){
const username = comment.user;
const content = comment.content;
console.log(comment);
const updatedComments = [...this.comments];
updatedComments.push({
user : username,
content: content
});
this.comments = updatedComments;
return this.save();
};
控制器，它从表单传递信息：
exports.postComment = (req,res,next) =>{
const bugId = req.body.bugID;
const name = req.session.user.fullName;
const content = req.body.content;
const prod = {name, content};
Bug.findById(bugId).then(bug =>{
return bug.addComment(prod);
})
.then(result =>{
console.log(result);
});
};
我收到以下错误：
(node:3508) UnhandledPromiseRejectionWarning: TypeError: this.comments is not iterable
慕神84474893回答
-
桃花长相依
(node:3508) UnhandledPromiseRejectionWarning: TypeError: this.comments is not iterable该错误表明您正在尝试迭代一种不具有该功能的数据。您可以检查打印类型：console.log(typeof this.comments)甚至，打印整个对象：console.log(this.comments)如您所见，在这两种情况下，您都得到一个对象，而不是列表（您如何看待）所以你可以做两件事：1-可迭代列表this.comments是一个对象，但在该对象中你有你想要的列表，所以只需使用列表。bugSchema.methods.addComment = function(comment){ const username = comment.user; const content = comment.content; console.log(comment); //const updatedComments = [...this.comments]; const updatedComments = [...this.comments.comment]; updatedComments.push({ user : username, content: content }); this.comments = updatedComments; return this.save();};或者您可以修改架构，使评论成为列表而不是对象2-注释作为架构中的列表将评论属性定义为列表const bugSchema = new Schema({ title: { type: String, required: true }, description: { type: String, required: true }, ... ..., comments:[ { user:{ type: String, required: true }, content: { type: String, required: true } } ]});然后，尝试按照您的方式对其进行迭代bugSchema.methods.addComment = function(comment){ const username = comment.user; const content = comment.content; console.log(comment); const updatedComments = [...this.comments]; updatedComments.push({ user : username, content: content }); this.comments = updatedComments; return this.save();}; -
Smart猫小萌
从您的架构注释中，它不是一个数组。您正在尝试将对象传播到数组中。const updatedComments = [...this.comments];还推动阵列上的工作。尝试通过在 bugSchema 之外声明 commentSchema 来修改您的模式定义。const commentSchema = new Schema({ user:{ type: String, required: true }, content: { type: String, required: true }})const bugSchema = new Schema({ comments: { type: [commentSchema] }})Bug.findByIdAndUpdate(bugId, {$push: {comments: newComment}}) -
婷婷同学_
我不确定，但评论是一个对象而不是数组，所以你不能使用 [...this.comments] 推送，我认为这是你想要推送的评论？const updatedComments = [...this.comment];updatedComments.push({ user : username, content: content});this.comment = updatedComments;
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相关分类
JavaScript