Change default value of max_per_page from 0 to nil

README.rdoc

@@ -73,7 +73,7 @@ Then bundle:
 
 You can configure the following default values by overriding these values using <tt>Kaminari.configure</tt> method.
   default_per_page  # 25 by default
-  max_per_page      # 0 by default
+  max_per_page      # nil by default
   window            # 4 by default
   outer_window      # 0 by default
   left              # 0 by default
@@ -104,7 +104,7 @@ Run the following generator command, then edit the generated file.
 * +max_paginates_per+
 
   You can specify max +per_page+ value per each model using the following declarative DSL.
-  If the variable that specified via +per+ scope is more than this variable, max +paginates_per+ is used instead of it. Default value is 0, which means you are not specifying max +per_page+ value.
+  If the variable that specified via +per+ scope is more than this variable, max +paginates_per+ is used instead of it. Default value is nil, which means you are not imposing any max +per_page+ value.
     class User < ActiveRecord::Base
       max_paginates_per 100
     end

lib/kaminari/config.rb

@@ -38,7 +38,7 @@ def param_name
   # this is ugly. why can't we pass the default value to config_accessor...?
   configure do |config|
     config.default_per_page = 25
-    config.max_per_page = 0
+    config.max_per_page = nil
     config.window = 4
     config.outer_window = 0
     config.left = 0

lib/kaminari/models/page_scope_methods.rb

@@ -5,7 +5,7 @@ module PageScopeMethods
     def per(num)
       if (n = num.to_i) <= 0
         self
-      elsif max_per_page != 0 && max_per_page < n
+      elsif max_per_page && max_per_page < n
         limit(max_per_page).offset(offset_value / limit_value * max_per_page)
       else
         limit(n).offset(offset_value / limit_value * n)

spec/config/config_spec.rb

@@ -19,15 +19,15 @@
 
   describe 'max_per_page' do
     context 'by default' do
-      its(:max_per_page) { should == 0 }
+      its(:max_per_page) { should == nil }
     end
     context 'configure via config block' do
       before do
         Kaminari.configure {|c| c.max_per_page = 100}
       end
       its(:max_per_page) { should == 100 }
       after do
-        Kaminari.configure {|c| c.max_per_page = 0}
+        Kaminari.configure {|c| c.max_per_page = nil}
       end
     end
   end