How to: A custom CSVBulkLoader instance

A an implementation of a custom CSVBulkLoader loader. In this example. we're provided with a unique CSV file containing a list of football players and the team they play for. The file we have is in the format like below.

	"SpielerNummer", "Name", "Geburtsdatum", "Gruppe"
	11, "John Doe", 1982-05-12,"FC Bayern"
	12, "Jane Johnson", 1982-05-12,"FC Bayern"
	13, "Jimmy Dole",,"Schalke 04"

This data needs to be imported into our application. For this, we have two DataObjects setup. Player contains information about the individual player and a relation set up for managing the Team.

mysite/code/Player.php.

	class Player extends DataObject 
	{
	
	   private static $db = [
	      'PlayerNumber' => 'Int',
	      'FirstName' => 'Text',
	      'LastName' => 'Text',
	      'Birthday' => 'Date'
	   ];
	 
	   private static $has_one = [
	      'Team' => 'FootballTeam'
	   ];
	}

mysite/code/FootballTeam.php

	class FootballTeam extends DataObject 
	{
	   
	   private static $db = [
	      'Title' => 'Text'
	   ];

	   private static $has_many = [
	      'Players' => 'Player'
	   ];
	}

Now going back to look at the CSV, we can see that what we're provided with does not match what our data model looks like, so we have to create a sub class of CsvBulkLoader to handle the unique file. Things we need to consider with the custom importer are:

Convert property names (e.g Number to PlayerNumber) through providing a $columnMap.
Split a combined "Name" field into FirstName and LastName by calling importFirstAndLastName on the Name column
Prevent duplicate imports by a custom $duplicateChecks definition.
Create a Team automatically based on the Gruppe column and a entry for $relationCallbacks

Our final import looks like this.

mysite/code/PlayerCsvBulkLoader.php

	class PlayerCsvBulkLoader extends CsvBulkLoader 
	{

	   public $columnMap = [
	      'Number' => 'PlayerNumber',
	      'Name' => '->importFirstAndLastName',
	      'Geburtsdatum' => 'Birthday',
	      'Gruppe' => 'Team.Title',
	   ];

	   public $duplicateChecks = [
	      'SpielerNummer' => 'PlayerNumber'
	   ];

	   public $relationCallbacks = [
	      'Team.Title' => [
	         'relationname' => 'Team',
	         'callback' => 'getTeamByTitle'
	      ]
	   ];

	   public static function importFirstAndLastName(&$obj, $val, $record) 
	   {
	      $parts = explode(' ', $val);
	      if(count($parts) != 2) return false;
	      $obj->FirstName = $parts[0];
	      $obj->LastName = $parts[1];
	   }

	   public static function getTeamByTitle(&$obj, $val, $record) 
	   {
	      return FootballTeam::get()->filter('Title', $val)->First();
	   }
	}

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How to: A custom CSVBulkLoader instance

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