Improve Shotengai::Controller::Base about :paginate

lib/shotengai/controller/base.rb

@@ -75,7 +75,9 @@ module Shotengai
       def index
         page = params[:page] || 1
         per_page = params[:per_page] || 10
-        @resources = index_resources.paginate(page: page, per_page: per_page)
+
+        # @resources = index_resources.paginate(page: page, per_page: per_page)
+        @resources = paginate(index_resources, page: page, per_page: per_page)
         respond_with @resources, template: "#{@template_dir}/index"
       end
 
@@ -106,6 +108,7 @@ module Shotengai
       end
 
       private
+
         # Instance method: default_query
         #   example: 
         #     def default_query resources
@@ -147,6 +150,20 @@ module Shotengai
           @resource = default_resources.find(params[:id])
         end
         
+        def paginate resources, page: , per_page:
+          return resources if skip_paginate?
+          # page start with 1
+          if resources.is_a?(Array)
+            resources[(page - 1) * per_page ... page * per_page] || []
+          else
+            resources.offset((page - 1) * per_page).limit(per_page)
+          end
+        end
+
+        def skip_paginate?
+          page <= 0 || per_page <= 0
+        end
+        
         # If you want to add custome columns, you can do just like:
         #   def resource_params
         #     super&.merge params.require(:some_key)