New style replaces old filter models approach

Search builder base is aware of `models` now.

app/search_builders/curation_concerns/collection_search_builder.rb

@@ -8,27 +8,30 @@ module CurationConcerns
   #
   class CollectionSearchBuilder < ::SearchBuilder
     include FilterByType
+
     # Defines which search_params_logic should be used when searching for Collections
+    # @param [#blacklight_config, #current_ability] scope the object that has access to #blacklight_config
+    #   From a controller, scope would be `self`.  This argument is passed to ::SearchBuilder.new()
+    # @note permissions will otherwise be defaulted by inherited #discovery_permissions
+    # @see @discovery_permissions
     def initialize(context)
       @rows = 100
       super(context)
     end
 
-    # @return [String] class URI of the model, as indexed in Solr has_model_ssim field
-    def model_class_uri
-      ::Collection.to_class_uri
+    # @!group Overrides
+    #
+    # @return [Class] ActiveFedora model(s) indexed in Solr has_model_ssim field
+    def models
+      [::Collection]
     end
 
     # @return [String] Solr field name indicating default sort order
     def sort_field
       Solrizer.solr_name('title', :sortable)
     end
 
-    # @return [Hash{Symbol => Array[Symbol]}] bottom-up map of "what you need" to "what qualifies"
-    # @note i.e., requiring :read access is satisfied by either :read or :edit access
-    def access_levels
-      { read: [:read, :edit], edit: [:edit] }
-    end
+    # @!endgroup
 
     attr_writer :discovery_perms # TODO: remove this line
     ## Overrides
@@ -39,17 +42,19 @@ def discovery_permissions
       @discovery_perms || super
     end
 
-    # This overrides the filter_models in FilterByType
-    def filter_models(solr_parameters)
-      solr_parameters[:fq] ||= []
-      solr_parameters[:fq] << ActiveFedora::SolrQueryBuilder.construct_query_for_rel(has_model: model_class_uri)
-    end
-
     # Sort results by title if no query was supplied.
     # This overrides the default 'relevance' sort.
     def add_sorting_to_solr(solr_parameters)
       return if solr_parameters[:q]
       solr_parameters[:sort] ||= "#{sort_field} asc"
     end
+
+    private
+
+      # @return [Hash{Symbol => Array[Symbol]}] bottom-up map of "what you need" to "what qualifies"
+      # @note i.e., requiring :read access is satisfied by either :read or :edit access
+      def access_levels
+        { read: [:read, :edit], edit: [:edit] }
+      end
   end
 end