Question

我有一个MongoDB集合，其中包含以下格式的文档集合名称称为帖子

{
    "_id" : ObjectId("5c88b225fac24431d947abad"),
    "user_id" : "5c87ad6c623f1e2bd4d041d0",
    "post_likes" : [ 
        {
            "post_user_id" : "5c87ad6c623f1e2bd4d041d0",
            "like_status" : true
        }, 
        {
            "post_user_id" : "5c88b42b71611926c055508b",
            "like_status" : true
        }
    ],
    "post_comments" : [ 
        {
            "comment_user_id" : "5c87ad6c623f1e2bd4d041d0",
            "comment_like" : "",
            "comment_description" : ""
        }, 
        {
            "comment_user_id" : "5c88b42b71611926c055508b",
            "comment_like" : "",
            "comment_description" : "nice post"
        }
    ]
}

我还有一个名为user_ptofile_info的集合名称

{
    "_id" : ObjectId("5c923682c088564cf01056cb"),
    "user_id" : "5c87ad6c623f1e2bd4d041d0",
    "image_url" : "image/url",
    "user_name":"xxxxxxxx",
    "created_at" : "",
    "updated_at" : ""
}

要求的输出，如
注意：user_ptofile_info中的post_user_id和post中的user_id是查找对象，我也需要post_likes和发贴评论的总数

{
    "_id" : ObjectId("5c88b225fac24431d947abad"),
    "user_id" : "5c87ad6c623f1e2bd4d041d0",
    "post_likes" : [ 
        {
            "post_user_id" : "5c87ad6c623f1e2bd4d041d0",
            "like_status" : true,
            "image_url" : "image/url",
            "user_name":"xxxxxxxx",
        }, 
        {
            "post_user_id" : "5c88b42b71611926c055508b",
            "like_status" : true,
            "image_url" : "image/url",
            "user_name":"xxxxxxxx",
        }
    ],
    "post_comments" : [ 
        {
            "comment_user_id" : "5c87ad6c623f1e2bd4d041d0",
            "comment_like" : "",
            "comment_description" : ""
        }, 
        {
            "comment_user_id" : "5c88b42b71611926c055508b",
            "comment_like" : "",
            "comment_description" : "nice post"
        }
    ]
}

Answer 1

您可以使用以下汇总：

<?php

namespace App\Http\Middleware;

use Illuminate\Auth\Middleware\Authenticate as Middleware;

class Authenticate extends Middleware
{
    /**
     * Get the path the user should be redirected to when they are not authenticated.
     *
     * @param  \Illuminate\Http\Request  $request
     * @return string
     */
    protected function redirectTo($request)
    {
        if (! $request->expectsJson()) {
            return route('login');
        }
    }
}

$lookup with custom pipeline（MongoDB 3.6或更高版本）将允许您从question = open("questions.txt", "r") print(question.readlines()[0]) tanswer = open("answers.txt", "r") correct_answer = float(tanswer.readlines()[0]) uanswer = float(input("Write the answer: ")) if correct_answer==uanswer: print("Amazing " + str(correct_answer) + " is the correct answer") else: print("Wrong " + str(uanswer) + " is not correct, Try again please. ")获取db.post.aggregate([ { $lookup: { from: "user_profile_info", let: { user_ids: "$post_likes.post_user_id" }, pipeline: [ { $match: { $expr: { $in: [ "$user_id", "$$user_ids" ] } } }, { $project: { post_user_id: "$user_id", image_url: 1, user_name: 1 } } ], as: "users" } }, { $project: { _id: 1, user_id: 1, post_likes: { $map: { input: "$users", as: "user", in: { post_user_id: "$$user.post_user_id", image_url: "$$user.image_url", user_name: "$$user.user_name", like_status: { $let: { vars: { like: { $arrayElemAt: [ { $filter: { input: "$post_likes", as: "pl", cond: { $eq: [ "$$pl.post_user_id", "$$user.post_user_id" ] } } }, 0 ] } }, in: "$$like.like_status" } } } } }, post_comments: 1 } } ])数组中存在的所有用户的数据。然后，您需要将user_profile_info的{{1}}数组与post_likes合并以获取users。由于您有两个数组，并且您知道两个数组中都出现相同的post_likes，因此可以将$map与$arrayElemAt和$filter结合使用，以合并来自两个数组的数据。 / p>

mongodb聚合与数组和查找

1 个答案: