README

Attempt to solve N+1 problem in SilverStripe 4.

Usage

MyModelClass::get()->with(['Relation1','Relation2'])->filter(...);

It does not require huge configuration - only one function to be added to the query builder chain : ->with([..relations...]). This will result in the final DataList to be presented by the EagerLoadedDataList class that handles the eager loading.

The module takes advantage of DataList::getGenerator() to query for and attach the related records only when needed.

Installation

composer require goldfinch/eagerloading

Every DataObject that has has_one/many_many/belongs_many_many which you wish to have eagerloaded must include EagerLoaderMultiAccessor (see below).

Features

• Using with $has_one / $belongs_to
• Using with $has_many / $many_many / $belongs_many_many
• Boosting GridField output
• Boosting CSV export

Read the docs for full explanation.

Quick start

1. Add the following trait to all your models to use $has_many, $many_many, $belongs_meny_many:

class MyClass extends DataObject {
    use Gurucomkz\EagerLoading\EagerLoaderMultiAccessor;

    // ...
}

If you have your own __call() read Using with $has_many/$many_many.

2. Declare private static $eager_loading to boost ModelAdmin's GridField output.

class YourClass extends DataObject
{
    private static $eager_loading = [
        'Relation1',
        'Relation1.Relation4',
        'Relation2',
        'Relation3',
    ];
}

TODO

• for ->with(['RelLevel1.RelLevel2']) - do not query for RelLevel1 IDs twice.
• for ->with(['RelLevel1','RelLevel1.RelLevel2']) - do not query for RelLevel1 IDs thrice.

Reporting Issues

Please create an issue for any bugs you've found, or features you're missing.