Do not display link to previous page if scope is out of range

lib/kaminari/helpers/action_view_extension.rb

@@ -41,7 +41,7 @@ module Kaminari
     def link_to_previous_page(scope, name, options = {}, &block)
       prev_page = Kaminari::Helpers::PrevPage.new self, options.reverse_merge(:current_page => scope.current_page)
 
-      link_to_unless scope.first_page?, name, prev_page.url, options.except(:params, :param_name).reverse_merge(:rel => 'prev') do
+      link_to_if scope.prev_page.present?, name, prev_page.url, options.except(:params, :param_name).reverse_merge(:rel => 'prev') do
         block.call if block
       end
     end

lib/kaminari/models/page_scope_methods.rb

@@ -55,7 +55,7 @@ module Kaminari
 
     # Previous page number in the collection
     def prev_page
-      current_page - 1 unless first_page?
+      current_page - 1 unless first_page? || current_page > (total_pages + 1)
     end
 
     # First page of the collection?

spec/helpers/action_view_extension_spec.rb

@@ -69,6 +69,13 @@ describe 'Kaminari::ActionViewExtension', :if => defined?(Rails) do
       subject { helper.link_to_previous_page @users, 'Previous', :params => {:controller => 'users', :action => 'index'} }
       it { should_not be }
     end
+
+    context 'out of range' do
+      before { @users = User.page(5) }
+
+      subject { helper.link_to_next_page @users, 'More', :params => {:controller => 'users', :action => 'index'} }
+      it { should_not be }
+    end
   end
 
   describe '#link_to_next_page' do
@@ -110,6 +117,13 @@ describe 'Kaminari::ActionViewExtension', :if => defined?(Rails) do
       subject { helper.link_to_next_page @users, 'More', :params => {:controller => 'users', :action => 'index'} }
       it { should_not be }
     end
+
+    context 'out of range' do
+      before { @users = User.page(5) }
+
+      subject { helper.link_to_next_page @users, 'More', :params => {:controller => 'users', :action => 'index'} }
+      it { should_not be }
+    end
   end
 
   describe '#page_entries_info' do

spec/models/active_record/scopes_spec.rb

@@ -204,6 +204,11 @@ if defined? ActiveRecord
             subject { model_class.page(5) }
             its(:prev_page) { should == 4 }
           end
+
+          context 'page 6' do
+            subject { model_class.page(6) }
+            its(:prev_page) { should be_nil }
+          end
         end
 
         describe '#first_page?' do

spec/models/array_spec.rb

@@ -141,6 +141,11 @@ describe Kaminari::PaginatableArray do
       subject { array.page 5 }
       its(:prev_page) { should == 4 }
     end
+
+    context 'page 6' do
+      subject { array.page 6 }
+      its(:prev_page) { should be_nil }
+    end
   end
 
   describe '#count' do