Laravel - 使用whereHas

Question

我正在努力争取时间＆＃34; created_at＆＃34;对于最后一个用户活动， 我有模型User和UserActivity 我想获取最后一个用户活动，并检查此用户的上一个活动是否为3天发送通知，

user.php的

<?php

namespace App;

use Illuminate\Database\Eloquent\Model;
class User extends Model
{
    public function activites()
    {
        return $this->hasMany(Activty::class);
    }

}

Activity.php

<?php

namespace App;

use Illuminate\Database\Eloquent\Model;
use Carbon\Carbon;

class Activity extends Model
{
    function function user(){
        return $this->belongsTo(User::class);
    }
}

控制器

$latest_activites = User::whereHas("activites",function($query){
            $query->where("created_at",">=",Carbon::now()->subDays(3));
        });
$latest_activites = $latest_activites->get();

Answer 1

您应该同时使用基于created_at的子查询过滤器来加载用户活动。拨打最新信息获取最后一条记录，你应该好好去。

import {Injectable} from '@angular/core';
import {Http, Headers} from '@angular/http';

@Injectable()
export class ApiService {

   constructor(private http: Http) {}

   call(url): Observable<any> {
      let username: string = 'username';
      let password: string = 'password';
      let headers: Headers = new Headers();
      headers.append("Authorization", "Basic " + btoa(username + ":" + password)); 
      return this.http.get(url, {headers: headers})
    }
}

Answer 2

主要结构：model::latest()->get()

  $latest_activites = User::with('activites')
                    ->where("activites",function($query){
                     .
                     .
                     .
                     .
            })->latest()->get();

Answer 3

首先，在User模型中创建另一个关系，has to be hasOne to get the latest activity：

public function latestActivity()
{
    return $this->hasOne(Activity::class)->latest();
}

然后只加载最新活动超过3天的用户

$users = User::whereHas('activites', function($q) {
        $q->where('created_at', '<=', now()->subDays(3));
    })
    ->whereDoesntHave('activites', function($q) {
        $q->where('created_at', '>', now()->subDays(3));
    })
    ->with('latestActivity')
    ->get();