How to show belongsTomany data in a datatable - sql

Question

DataTables warning: table id=dataTableBuilder - Exception Message:
SQLSTATE[42000]: Syntax error or access violation: 1066 Not unique table/alias: 'phyto_product' (SQL: select count(*) as aggregate from (select '1' as row_count from phyto_product left join phyto_product on phyto_product.id = phytos.phyto_id left join phyto_product on phyto_product.id = products.product_id where phyto_product.deleted_at is null) count_row_table)
I have a belongsTomany relationship between phyto and product as follows. I'm looking for a way to display in the datatable the following
phyto_number, product_name, weight, charge
My query (PhytoProduct is a pivot table)
public function query(PhytoProduct $model)
{
return $model->newQuery()->leftjoin('phyto_product','phyto_product.id', '=','phytos.phyto_id')
->leftjoin('phyto_product','phyto_product.id', '=', 'products.product_id')
->select('phyto_product.*', 'phytos.phyto_number','products.product_name');
}
My datatable
protected function getColumns()
{
return [
[ 'data' => 'phyto_number', 'name' => 'phytos.phyto_number', 'title' => 'Phyto Number' ],
[ 'data' => 'product_name', 'name' => 'products.product_name', 'title' => 'Product Name' ],
[ 'data' => 'weight', 'name' => 'phyto_product.weight', 'title' => 'Weight' ],
[ 'data' => 'charge', 'name' => 'phyto_product.charge', 'title' => 'charge' ],
];
}
Phyto Model
<?php
namespace App\Models;
use Eloquent as Model;
use Illuminate\Database\Eloquent\SoftDeletes;
/**
* Class Phyto
* #package App\Models
* #version December 27, 2019, 1:08 am UTC
*
* #property string phyto_number
* #property integer destination_id
* #property string indate
*/
class Phyto extends Model
{
use SoftDeletes;
public $table = 'phytos';
const CREATED_AT = 'created_at';
const UPDATED_AT = 'updated_at';
protected $dates = ['deleted_at'];
public $fillable = [
'phyto_number',
'destination_id',
'indate'
];
/**
* The attributes that should be casted to native types.
*
* #var array
*/
protected $casts = [
'id' => 'integer',
'phyto_number' => 'string',
'destination_id' => 'integer',
'indate' => 'date:d/m/y',
];
/**
* Validation rules
*
* #var array
*/
public static $rules = [
'phyto_number' => 'required',
'indate' => 'required'
];
public function products()
{
return $this->belongsToMany(Product::class)->withPivot(['weight','charge']);
}
public function destinations()
{
return $this->hasMany(Destination::class);
}
}
PhytoProduct Model
<?php
namespace App\Models;
use Eloquent as Model;
use Illuminate\Database\Eloquent\SoftDeletes;
/**
* Class PhytoProduct
* #package App\Models
* #version December 27, 2019, 2:20 am UTC
*
* #property integer phyto_id
* #property integer product_id
* #property number weight
* #property number charge
*/
class PhytoProduct extends Model
{
use SoftDeletes;
public $table = 'phyto_product';
const CREATED_AT = 'created_at';
const UPDATED_AT = 'updated_at';
protected $dates = ['deleted_at'];
public $fillable = [
'phyto_id',
'product_id',
'weight',
'charge'
];
/**
* The attributes that should be casted to native types.
*
* #var array
*/
protected $casts = [
'id' => 'integer',
'phyto_id' => 'integer',
'product_id' => 'integer',
'weight' => 'float',
'charge' => 'float'
];
/**
* Validation rules
*
* #var array
*/
public static $rules = [
'phyto_id' => 'required',
'product_id' => 'required'
];
}
Product Model
<?php
namespace App\Models;
use Eloquent as Model;
use Illuminate\Database\Eloquent\SoftDeletes;
/**
* Class Product
* #package App\Models
* #version December 27, 2019, 1:07 am UTC
*
* #property string product_name
*/
class Product extends Model
{
use SoftDeletes;
public $table = 'products';
const CREATED_AT = 'created_at';
const UPDATED_AT = 'updated_at';
protected $dates = ['deleted_at'];
public $fillable = [
'product_name'
];
/**
* The attributes that should be casted to native types.
*
* #var array
*/
protected $casts = [
'id' => 'integer',
'product_name' => 'string'
];
/**
* Validation rules
*
* #var array
*/
public static $rules = [
'product_name' => 'required'
];
public function phytos()
{
return $this->belongsToMany(Product::class)->withPivot(['weight','charge']);
}
}

Answer 1

The answer is based on this sql
SELECT phyto_product.weight,
phytos.phyto_number,
products.product_name
FROM phyto_product
LEFT JOIN phytos ON phytos.id = phyto_product.phyto_id
Left join products ON products.id = phyto_product.product_id
and then translated into this
public function query(PhytoProduct $model)
{
return $model->newQuery()->leftjoin('phytos','phytos.id', '=', 'phyto_product.phyto_id')
->leftjoin('products','products.id', '=', 'phyto_product.product_id')
->select('phyto_product.*', 'phytos.*','products.*');
}