GridFieldEditableManyManyExtraColumns

The class adds extra form fields to the gridfield to edit DataObject::$many_many_extraFields

Requirements

SilverStripe 3.x

Installation

Download the module from here https://github.com/smindel/ Extract the downloaded archive into your site root so that the destination folder is called gridfieldeditablemanymanyextracolumns. Run dev/build?flush=all

Basic Usage

class Foo extends DataObject {

    static $many_many = array(
        'Bars' => 'Bar',
    );

    static $many_many_extraFields = array(
        'Bars' => array(
            'MyExtraField' => 'Varchar',
        ),
    );

    function getCMSFields() {
        $fields = parent::getCMSFields();
        $fields->dataFieldByName('Bars')->getConfig()->addComponent(new GridFieldEditableManyManyExtraColumns(), 'GridFieldEditButton');
        return $fields;
    }
}

class Bar extends DataObject {

    static $belongs_many_many = array(
        'Foos' => 'Foo',
    );

    function getCMSFields() {
        $fields = parent::getCMSFields();
        $fields->dataFieldByName('Foos')->getConfig()->addComponent(new GridFieldEditableManyManyExtraColumns(), 'GridFieldEditButton');
        return $fields;
    }
}

The rest is pure magic