Laravel Eloquent Eager Loading : Join same table twice

database, eloquent, join, laravel, php

Solution

class T1 extends Eloquent {

    protected $table = 't1';

}

class T2 extends Eloquent {

    protected $table = 't2';

    public function customer()
    {
        return $this->belongsTo('T1','c_id');//c_id - customer id
    }
    public function staff()
    {
        return $this->belongsTo('T1','s_id');//s_id - staff id
    }
}

With use "with":

$list = \T2::with('customer')->with('staff')->get();
foreach ($list as $row) {
    echo 'ID: '.$row->id.', customer: '.$row->customer->name.', staff: '.$row->staff->name.'<br>';
}

With joins:

$list = \T2::leftJoin('t1 as customer_table', 'customer_table.id','=','t2.c_id')
     ->leftJoin('t1 as staff_table', 'staff_table.id','=','t2.s_id')
     ->select('staff_table.name as staff_name','customer_table.name as customer_name')
     ->get();
foreach ($list as $row) {
    echo 'customer: '.$row->customer_name.', staff: '.$row->staff_name.'<br>';
}

About second question - This is for subqueries. Look documentation: http://laravel.com/docs/eloquent#eager-loading

Problem

I have a users table and an appointments table. In appointment table I have two user ID's (customer_id, staff_id). I want to retrieve all the appointments with customer name and the staff name. ``` users table id name appointments table id staff_id(user_id) customer_id(user_id) datetime ``` As you can see, I have to join the users table twice with the appointments table. Usually I do this with inner joins. Can we do the same thing with Laravel eloquent eager loading using with()? Can we do something like: ``` appointments::with('users' * )->get();? * Do something here to inner join users table twice, and read user1.name as staff_name, user2.name as customer_name. ``` This is the final output I need: ``` appointment_id staff_id staff_name customer_id customer_name datetime ``` I have another question, what is the second parameter in the following query? ``` User::with(array( 'post'=> function() use $region { //what is use $region means? Can you give me an example? } )); ``` Thanks!

Original source