Add a FilterableInterface

[dkarlovi]

Q	A
Bug report?	no
Feature request?	yes
BC Break report?	no
RFC?	yes

Currently CoreShop\Component\Core\Model\CategoryInterface has getFilter(), but there's nothing intrinsic about a category having a filter. In my use case, I'd like to attach a filter to brands, product series and other custom objects which are similar to categories in nature (a collection of products), but different.

This would also mean I'd be able to use my custom (Elasticsearch based) filtering on custom objects which are filterable.

[dpfaffenbauer]

Filtering and Processing the Filters done in the Controller is quite heavy as well, maybe we can introduce a FilterableInterface and some sort of Service processing that returning a Pageable Listing?

[dkarlovi]

Yes, that's exactly what I'm currently doing in my own project. :)

[dpfaffenbauer]

@dkarlovi Any progress in your Project? Maybe something we can re-use here?