diff --git a/app/controllers/api/v2/restful_controller.rb b/app/controllers/api/v2/restful_controller.rb
index 74a8f472..f837957d 100644
--- a/app/controllers/api/v2/restful_controller.rb
+++ b/app/controllers/api/v2/restful_controller.rb
@@ -99,19 +99,24 @@ module Api
       end
 
       def pagination(collection)
-        @pagination_data ||= {
-          current_page: (params[:page] || 1).to_i,
+        return @pagination_data unless @pagination_data.nil?
+
+        current_page = (params[:page] || 1).to_i
+        per = (params[:per] || 25).to_i
+        total_pages = (collection.total_count.to_f / per).ceil
+        @pagination_data = {
+          current_page: current_page,
           next_page: current_page < total_pages ? current_page + 1 : 0,
           prev_page: current_page > 1 ? current_page - 1 : 0,
-          total_pages: (collection.total_count.to_f / per).ceil,
+          total_pages: total_pages,
           total_count: collection.total_count,
-          per: (params[:per] || 25).to_i
+          per: per
         }
       end
 
       def pagination_link_headers!(data)
         base_url = request.base_url + request.path
-        old_query = request_query_parameters
+        old_query = request.query_parameters
         nxt = old_query.merge(page: data[:next_page]).map { |x| x.join('=') }.join('&')
         prev = old_query.merge(page: data[:prev_page]).map { |x| x.join('=') }.join('&')
         last = old_query.merge(page: data[:total_pages]).map { |x| x.join('=') }.join('&')
@@ -123,7 +128,7 @@ module Api
         ].join(',')
         response.headers['X-Total-Pages'] = data[:total_pages].to_s
         response.headers['X-Total-Count'] = data[:total_count].to_s
-        response.headers['X-Per-Page'] = per.to_s
+        response.headers['X-Per-Page'] = data[:per].to_s
       end
 
       def instantiate_collection
diff --git a/app/policies/map_policy.rb b/app/policies/map_policy.rb
index b2a04cbe..4cb2db38 100644
--- a/app/policies/map_policy.rb
+++ b/app/policies/map_policy.rb
@@ -16,7 +16,7 @@ class MapPolicy < ApplicationPolicy
   end
 
   def show?
-    record.permission.in?('commons', 'public') ||
+    record.permission.in?(['commons', 'public']) ||
       record.collaborators.include?(user) ||
       record.user == user
   end
diff --git a/app/policies/topic_policy.rb b/app/policies/topic_policy.rb
index cbde51d8..7bcf585c 100644
--- a/app/policies/topic_policy.rb
+++ b/app/policies/topic_policy.rb
@@ -23,7 +23,7 @@ class TopicPolicy < ApplicationPolicy
     if record.defer_to_map.present?
       map_policy.show?
     else
-      record.permission.in?('commons', 'public') || record.user == user
+      record.permission.in?(['commons', 'public']) || record.user == user
     end
   end