Laravel Relation in multiple table - php

Question

I have 3 tables like below.
Table A
id | val_a
1 | a1
2 | a2
3 | a3
Table B
id | id_a| val_b | id_c
1 | 2 | b1 | 1
2 | 2 | b2 | 3
3 | 3 | b3 | 4
Table C
id | val_c
1 | c1
2 | c2
3 | c3
4 | c4
What is the best way to get data like below :
[
[0] => stdClass Object
(
[id_a] => 1
[val_a] => 'a1'
)
[1] => stdClass Object
(
[id_a] => 2
[val_a] => 'a2'
[table_b_c] => Array
(
[0] => stdClass Object
(
[id_b] => 1
[val_b] => 'b1'
[id_c] => 1
[val_c] => 'c1'
)
[1] => stdClass Object
(
[id_b] => 2
[val_b] => 'b2'
[id_c] => 3
[val_c] => 'c3'
)
)
)
[2] => stdClass Object
(
[id_a] => 3
[val_a] => 'a3'
[table_b] => Array
(
[0] => stdClass Object
(
[id_b] => 3
[val_b] => 'b3'
[id_c] => 4
[val_c] => 'c4'
)
)
)
]
Model for TableA
class TableA extends Model {
public function getTableA($id_a) {
return $this->where('id', $id_a)->with('TableB', 'TableC')->get()->toArray();
}
}
Model for TableB
class TableB extends Model {
public function tableA(){
$this->belongsTo('App\tableA');
}
public function tableC(){
$this->belongsTo('App\tableC');
}
}
Model for TableC
class TableC extends Model {
}
I have tried above relation but it not work for me.
I am using Laravel 5.2. And achieve this by foreach loop. But I don't know what is the best way to do. Can I do this by laravel or Mysql ? Thanks Ahead.

Answer 1

I've setup some data my side and used this documentation to return a nested object.
Your model function names must be labelled correctly, then this will work:
$data = TableA::with(['recordsB.recordC'])->get();
dd($data->toArray());
This means that all TableA records will be fetch, it then adds all the records from table B related to each A record. As long as the function name in the model is recordsB. The dot syntax then adds the nested and related records from table C (for each B record), given the correct function name once again. See "Nested Eager Loading" in the documentation.
The data you're depicting seems it's not for a specific A record. So better to have the eager loading in a controller perhaps. For this reason I removed the id parameter from getTableA function.
In models - model TableA:
class TableA extends Model {
public function getTableA() {
$data = TableA::with(['recordsB.recordC'])->get();
return $data;
}
public function recordsB(){
$this->hasMany('App\TableB');
}
}
Model TableB:
class TableB extends Model {
public function recordA(){
$this->belongsTo('App\TableA');
}
public function recordC(){
$this->belongsTo('App\TableC');
}
}
Model TableC:
class TableC extends Model {
public function recordsB(){
$this->hasMany('App\TableB');
}
}