Pass chain function as paramter as parameter in php - php

Question

I have a function. It has method chaining that needs to be performed.
public function someFunction()
{
$query=$this->model;
$query->select($columns)
->skip($request->get('start') * $request->get('length'))
->take($request->get('length'))
->orderBy(
$request->get('sort_column'),
$request->get('sort_direction')
)
->get();
//Some other task
}
It was working fine but I need a slight modification in that function what I want is I want to pass a join in that function for method chaining.
public function someFunction($join_as_parameter)
{
$query=$this->model;
$query->select($columns)
//Join should be executed here as a parameter in method chaning .
->skip($request->get('start') * $request->get('length'))
->take($request->get('length'))
->orderBy(
$request->get('sort_column'),
$request->get('sort_direction')
)
->get();
//Some other task
}
So that final function execution will be like this
public function someFunction($join_as_parameter)
{
$query=$this->model;
$query->select($columns)
->join('table','sometable.id', '=', 'other_table')
->skip($request->get('start') * $request->get('length'))
->take($request->get('length'))
->orderBy(
$request->get('sort_column'),
$request->get('sort_direction')
)
->get();
//Some other task
}
Is there any way to do this? Any help would be appreciated. Thanks.

Answer 1

This way you can achieve what you need.
use DB;
use Closure;
use Illuminate\Database\Query\JoinClause;
public function someFunction(Closure $join_clauser)
{
//create Query Builder object
$query = DB::query();
//Add the `$join` object to the table joins for this query
$join_as_parameter = call_user_func($join_closure, $query);
$query->joins = array_merge((array) $query->joins, [$join_as_parameter]);
$query->select($columns)
->skip($request->get('start') * $request->get('length'))
->take($request->get('length'))
->orderBy(
$request->get('sort_column'),
$request->get('sort_direction')
)
->get();
//Some other task
}
//create Query Builder object
$query = DB::query();
And execute the functions as,
someFunction(function($query){
// return JoinClause object with joining conditions
return (new JoinClause($query, 'inner', 'table'))
->on('table.id', '=', 'othe_table.table_id');
});
Furthermore, you can modify this to pass array of joins to add multiple joins your the query.
To use this with eloquent models, replace
$query = DB::query();
with
$query = Model::query()->getQuery();
NOTE : ->getQuery() is used to retrieve the Query\Builder object since JoinClause expects it as the first param.