Advanced Active Record Querying

Ruby on Rails
1

I have the following models

Items 
Customisations
Property Maps

with Associations like so –

**Customizations**
belongs_to :item
has_many :property_maps, as: :mappable

 **Items**
  has_many :customizations
  has_many :property_maps, as: :mappable

**Property Maps**
belongs_to :mappable, polymorphic: true

I’ve implemented a pretty decent filtering system taking into consideration just Items and properties like so –

	def self.filter_in_properties(property_ids, group_name)
           joins(:property_maps).joins('JOIN property_maps '+group_name+' ON '+group_name+'.mappable_id = items.id  AND '+group_name+'.property_id IN ('+property_ids.to_s.tr('[', '').tr(']', '').tr('"', '') +')')
	end

and I call them in the controller like so –

@items_without_pagination.filter_in_properties(params[:color_filter], 'color_filter').uniq

How can I do build out a filtering system so that when for example a user searches for the color red, it not only returns items that have the property red but also return items which have customizations with the property red?