Allow index meta param enrichment

lib/dunlop/ember/api_base_controller.rb

@@ -7,6 +7,7 @@ module Dunlop::Ember::ApiBaseController
     before_action :set_current_user
     before_action :find_record, only: %i[show update destroy]
     respond_to :json, :csv
+
     rescue_from CanCan::AccessDenied do
       render json: {errors: [{status: 403, detail: 'unauthorized'}]}, status: 403
     end
@@ -23,9 +24,9 @@ module Dunlop::Ember::ApiBaseController
     result = result.uniq if params[:uniq].present?
     if index_pagination?
       paginated = result.page(params[:page]).per(params[:per_page])
-      render json: paginated, meta: {total_pages: paginated.total_pages, total_count: paginated.total_count}
+      render json: paginated, meta: index_meta_params.merge(total_pages: paginated.total_pages, total_count: paginated.total_count)
     else
-      render json: result
+      render json: result, meta: index_meta_params
     end
   end
 
@@ -167,6 +168,12 @@ module Dunlop::Ember::ApiBaseController
     end
   end
 
+  # This method can be overloaded by the including controller to enrich the meta information of the collection
+  # with other meta-data
+  def index_meta_params
+    {}
+  end
+
   # /(_eq|_eq_any|_eq_all|_not_eq|_not_eq_any|_not_eq_all|_matches|_matches_any|_matches_all|
   #   _does_not_match|_does_not_match_any|_does_not_match_all|_lt|_lt_any|_lt_all|_lteq|_lteq_any|
   #   _lteq_all|_gt|_gt_any|_gt_all|_gteq|_gteq_any|_gteq_all|_in|_in_any|_in_all|_not_in|_not_in_any|