如何使用 Laravel eloquent 获取表中每个用户的最新记录

Question

I have n users in a table and for each user, I'm saving their log-in and log-out time in a separate table. I want to get the details of the users who haven't logged-in for 2 days using Laravel eloquent.

Users table structure

id | name | email

Log table structure

id |action | user_id | created_at | updated_at

So far I have done this much:

$users = LogsData::where('action','Login')->where('created_at','<',Carbon::now()->subDays(1))->get();

But the output has users who have logged-in within 2 days also.

EDIT: I got the query, I need to convert this into eloquent.

I solved it myself. Here is the solution:

SELECT t1.* FROM actions t1
  JOIN (SELECT user_id, MAX(id) as maxid  FROM actions where action = "LOGIN" GROUP BY user_id) t2
    ON t1.user_id = t2.user_id and t1.id = t2.maxid
     where created_at < NOW() - INTERVAL 2 DAY

Answer 1

If you only need to get the last data of each user, you can sort the id desc and then group by user_id to get the latest data

$users = LogsData::where('action','Login')
                 ->whereDate('created_at','<',Carbon::today()->subDays(1))
                 ->orderBy('id', 'DESC')
                 ->groupBy('user_id')
                 ->get();

to use groupBy , you have to change the strict from your config value into false . But if you don't want to change your config file, this query can help you. You just need to translate it into laravel query version

SELECT * FROM log_datas AS ld WHERE ld.action = 'Login' AND ld.id IN (SELECT MAX(id) FROM log_datas WHERE created_at < DATE_SUB(NOW(), INTERVAL 1 DAY) GROUP_BY user_id)

Answer 2

You need to make a join to the logs table first, and because MySQL always seeks the path of least resistance, you need to join it the other way around: there may not exists log entries YOUNGER than 1 day.

$users = DB::from('users')
    ->leftJoin('logs', function ($join) {
        $join->on('users.id', '=', 'logs.user_id')
            ->where('logs.action', '=', 'Login')
            ->where('logs.created_at', '>=', Carbon::now()->subDays(2));
    })
    ->whereNull('logs.id')
    ->get();

Answer 3

Maybe try using eloquent relations

Take note of your namespaces make sure that App\LogsData for example is correct here

// in your User Model
public function logsData()
{
    return $this->hasMany('App\LogsData');
}

// in your LogsData Model
public function user()
{
    return $this->belongsTo('App\User');
}

public function scopeLoginActions($query)
{
    return $query->where('action', 'Login');
}

Then you can access data with

User::whereHas('logsData', function ($query) {
    $query->loginActions()->where('created_at', '<', now()->subDays(2));
})->get();

// and if you require the login records
User::with('logsData')->whereHas('logsData', function ($query) {
    $query->loginActions()->where('created_at', '<', now()->subDays(2));
})->get();

// and if you require an individual login record
User::with(['logsData' => function($query) {
    $query->loginActions()->where('created_at', '<', now()->subDays(2))->first();
})->whereHas('logsData', function ($query) {
    $query->loginActions()->where('created_at', '<', now()->subDays(2));
})->get();