node.js - 从 Nodejs 和 Mongoose 中的关注者加载帖子
问题描述
我有一个类似下面的帖子架构,但在从我的关注者那里获取帖子时遇到问题。我也尝试过使用,但都无济于事。请帮助我有一个如下所示的帖子架构,但在从我的关注者那里获取帖子时遇到问题。我也尝试过使用,但都无济于事。请帮助我有一个如下所示的帖子架构,但在从我的关注者那里获取帖子时遇到问题。我也尝试过使用,但都无济于事。请帮忙
const mongoose = require('mongoose');
const Schema = mongoose.Schema;
const PostSchema =new Schema({
user: {
type: Schema.Types.ObjectId,
ref:'users'
},
text:{
type:String,
required: true
},
name:{
type:String
},
avatar:{
type:String
},
likes:[
{
user:{
type: Schema.Types.ObjectId,
ref: 'users'
}
}
],
comments:[
{
user:{
type: Schema.Types.ObjectId,
ref: 'users'
},
text:{
type:String,
required: true
},
name: {
type: String
},
avatar: {
type: String
},
date:{
type:Date,
default: Date.now
},
likes: [
{
user: {
type: Schema.Types.ObjectId,
ref: 'users'
}
}
],
}
],
reposter: [
{
user: { type: mongoose.Schema.Types.ObjectId, ref: "User" },
date: {
type: Date,
default: Date.now
}
}
],
numberOfRepost: { type: Number, default: 0 },
date: {
type: Date,
default: Date.now
}
});
module.exports = Post = mongoose.model('post', PostSchema);
解决方案
首先,你应该重新考虑一下 mongo-collection 的设计,这里有一些建议最好考虑一下。
- 使用Upper Camel case 来声明 mongoose 模型对象。(帖子,用户,...)
- 始终将_放在任何引用变量之前。(帖子模型中的 _user )
- 分离您的集合并尽可能避免冗余属性。
- 始终对集合使用复数名称。(帖子与帖子)
- 不要忘记将created和updated属性添加到每个集合。(这个 hack 可以帮助你记录和调查你的模型)
现在,让我们看看我们的新设计:
- name 和 avatar 是 Post 模型中的冗余数据。您可以稍后填充它们。
- 将 Like、Comment、RePoster 与 Post 模型分开。
这是改进的 Post 模型对象。
const mongoose = require('mongoose');
const Schema = mongoose.Schema;
const PostSchema = new Schema(
{
_user: { type: Schema.Types.ObjectId, ref: 'User' },
text:{ type:String, required: true },
rePostsNum: { type: Number, default: 0 },
// any other meta data which you need
creaetd: Date,
updated: Date
},
{
collection: 'posts',
strict: true,
autoIndex: true
}
);
PostSchema.pre('save', function (next) {
if( this.isNew )
this.created = new Date();
this.updated = new Date();
next();
});
module.exports = Post = mongoose.model('Post', PostSchema);
您也可以放入_comments: [{ type: Schema.Types.ObjectId, ref: 'Comment' }]
Post 模型,但请考虑一下!如果可以在_comments 数组中存储数千条评论引用键,则不推荐,这就像技术债务一样。
其他型号:
评论:
const mongoose = require('mongoose');
const Schema = mongoose.Schema;
const CommentSchema = new Schema(
{
_user: { type: Schema.Types.ObjectId, ref: 'User' },
_post: { type: Schema.Types.ObjectId, ref: 'Post' },
text:{ type:String, required: true },
likesNum: { type: Number, default: 0 },
creaetd: Date,
updated: Date
},
{
collection: 'posts',
strict: true,
autoIndex: true
}
);
CommentSchema.pre('save', function (next) {
if( this.isNew )
this.created = new Date();
this.updated = new Date();
next();
});
module.exports = Comment = mongoose.model('Comment', CommentSchema);
点赞帖子
const mongoose = require('mongoose');
const Schema = mongoose.Schema;
const LikePostSchema = new Schema(
{
_user: { type: Schema.Types.ObjectId, ref: 'User' },
_post: { type: Schema.Types.ObjectId, ref: 'Post' },
creaetd: Date,
updated: Date
},
{
collection: 'likePosts',
strict: true,
autoIndex: true
}
);
LikePostSchema.pre('save', function (next) {
if( this.isNew )
this.created = new Date();
this.updated = new Date();
next();
});
module.exports = LikePost = mongoose.model('LikePost', LikePostSchema);
喜欢评论
const mongoose = require('mongoose');
const Schema = mongoose.Schema;
const LikeCommentSchema = new Schema(
{
_user: { type: Schema.Types.ObjectId, ref: 'User' },
_comment: { type: Schema.Types.ObjectId, ref: 'Comment' },
creaetd: Date,
updated: Date
},
{
collection: 'likeComments',
strict: true,
autoIndex: true
}
);
LikeCommentSchema.pre('save', function (next) {
if( this.isNew )
this.created = new Date();
this.updated = new Date();
next();
});
module.exports = LikeComment = mongoose.model('LikeComment', LikeCommentSchema);
用户
const mongoose = require('mongoose');
const Schema = mongoose.Schema;
const UserSchema = new Schema(
{
name:{ type:String, required: true },
avatar:{ type:String, required: true },
// any other meta data which you need
creaetd: Date,
updated: Date
},
{
collection: 'users',
strict: true,
autoIndex: true
}
);
UserSchema.pre('save', function (next) {
if( this.isNew )
this.created = new Date();
this.updated = new Date();
next();
});
module.exports = User = mongoose.model('User', UserSchema);
重新发布
const mongoose = require('mongoose');
const Schema = mongoose.Schema;
const RePostSchema = new Schema(
{
_user: { type: Schema.Types.ObjectId, ref: 'User' },
_post: { type: Schema.Types.ObjectId, ref: 'Post' },
creaetd: Date,
updated: Date
},
{
collection: 'rePosts',
strict: true,
autoIndex: true
}
);
RePostSchema.pre('save', function (next) {
if( this.isNew )
this.created = new Date();
this.updated = new Date();
next();
});
module.exports = RePost = mongoose.model('RePost', RePostSchema);
欢迎回来!现在我们的新设计是完全可扩展的,并指导您编写干净和健壮的代码。最后,我们可以查询和填充数据,这是两个很酷的示例代码:
加载特定用户的帖子
var mongoose = require('mongoose');
var User = mongoose.model('User');
var Post = mongoose.model('Post');
var Comment = mongoose.model('Comment');
var LikePost = mongoose.model('LikePost');
var LikeComment = mongoose.model('LikeComment');
var RePost = mongoose.model('RePost');
Post
.find({ _user: userId })
.select('_id _user text ...')
.populate({
path: '_user',
select: '_id name avatar ...'
})
.exec(function (err, poats) {
加载特定帖子的评论
Comment
.find({ _post: postId })
.select('_id _post _user text ...')
.populate({
path: '_user',
select: '_id name avatar ...'
})
.exec(function (err, comments) {
推荐阅读
- arm-template - 使用 ARM 模板重新部署应用程序网关时,侦听器和 SSL 证书将被删除
- java - java中的静态数组和循环
- python - 从 datetime.now() 中减去 3 个月
- ios - iOS 布局在 Xcode 11 上的 iOS 13 上中断 - 未调用 traitCollectionDidChange
- php - 如何四舍五入
- c# - c# Sockets 编程错误
- ros - 如何在 rosnode 中将值从一个订阅者的回调函数传递给另一个订阅者
- python - 将列表拆分为最大元素数
- post - 通过 Saml2PostBinding 启动 SingleSignOn
- android - 是否应该再次确认订阅续订?