Laravel 4 - dependency injection based on configuration?

Question

I have an interface

interface RecordsService {
  public function getRecords();
}

and two implementations:

public class ApiRecordsService implements RecordsService {
  public function getRecords() {
   //get records from api
  }
}


public class DbRecordsService implements RecordsService {
  public function getRecords() {
   //get records from db
  }
}

Now, in my controller I do DI like this:

class RecordsController {
  private $recordsService;

  public function __construct(RecordsService $recordsService) {
    $this->recordsService= $recordsService;
  }
}

And I bind it like this:

App::bind('RecordsService', 'ApiRecordsService');

Now, my question is, is it possible to implement this more dynamically, based on configuration, something like this:

switch( Config::get('config.records_source') ){
   case 'db':
     App::bind('RecordsService', 'DbRecordsService');
     break;
   case 'api':
     App::bind('RecordsService', 'ApiRecordsService');
     break; 
}

and more important, is this a good practice ?

Filip Koblański · Accepted Answer · 2016-05-04 20:13:25Z

1

You can use for that an annonymous function like that:

App::bind('RecordsService', function() {
    switch( Config::get('config.records_source') ){
        case 'db':
            return new DbRecordsService;
        case 'api':
            return new ApiRecordsService;
    }
});

answered May 4, 2016 at 20:13

Filip Koblański

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