Add 'where' in query with foreach or something similar - mysql

Question

this is my problem.
product_field_glue table:
id | field_id | value
----------------------
1 | 50 | blue
2 | 51 | wood
3 | 50 | red
4 | 35 | car
I need to search products by this fields according _GET params
/?field[50][]=blue&field[35][]=car
this should return all blue cars
$result = Products::select('products.*')
->leftJoin('product_field_glue', function ($join) {
$join->on('product_field_glue.product_code', '=', 'products.product_code');
})
->where(function($query) use ($id, $value){
$query->where('product_fields.field_id', $id);
$query->where('product_fields.value', $value);
})
This is modified (part of) query. As you can see I need to set 'where' for all _GET['field'] and $key=>$value of GET parameter need to be in grouped where.
Maybe there is better solution for this kind of search which you can recommend.

Answer 1

I like to use scopes for this.
Inside your Products class:
/**
* Warning: requires a join on product_field_glue table
*
* #param \Illuminate\Database\Eloquent\Builder $query
* #param array $fields
* #return \Illuminate\Database\Eloquent\Builder
*/
public function scopeSearchFields($query, $fields) {
if (empty($fields)) {
return $query;
}
foreach ($fields as $id => $values) {
$query = $query->where(function ($subquery) use($id, $values) {
$subquery->where('product_field_glue.field_id', $id);
$subquery->whereIn('product_field_glue.value', $values);
});
}
return $query;
}
Notice that the method is called scopeSearchFields. You can attach it to any Products query as a chained searchFields method:
$result = Products::select('products.*')
->leftJoin('product_field_glue', function ($join) {
$join->on('product_field_glue.product_code', '=', 'products.product_code');
})
->searchFields($request->input('fields'))
->get();
The beauty of this is that it's extremely reusable and keeps all of the if and for loops inside of the scope method.