enable use of Sequel datasets with page_entries_info helper

lib/will_paginate/sequel.rb

@@ -13,6 +13,11 @@ def per_page
       page_size
     end
 
+    def size
+      current_page_record_count
+    end
+    alias length size
+
     def total_entries
       pagination_record_count
     end

spec/console

@@ -3,6 +3,8 @@ irb = RUBY_PLATFORM =~ /(:?mswin|mingw)/ ? 'irb.bat' : 'irb'
 opts = %w[ --simple-prompt -rirb/completion ]
 if ARGV.include? '-dm'
   opts << '-rwill_paginate/data_mapper' << '-rfinders/data_mapper_test_connector'
+elsif ARGV.include? '-seq'
+  opts << '-rwill_paginate/sequel' << '-rfinders/sequel_test_connector'
 else
   opts << '-rconsole_fixtures'
 end

spec/finders/sequel_spec.rb

@@ -33,6 +33,9 @@ class Car < Sequel::Model
     it "should imitate WillPaginate::Collection" do
       result = Car.paginate(1, 2)
 
+      result.should_not be_empty
+      result.size.should == 2
+      result.length.should == 2
       result.total_entries.should == 3
       result.total_pages.should == 2
       result.per_page.should == 2
@@ -42,6 +45,11 @@ class Car < Sequel::Model
     it "should perform" do
       Car.paginate(1, 2).all.should == [Car[1], Car[2]]
     end
+
+    it "should be empty" do
+      result = Car.paginate(3, 2)
+      result.should be_empty
+    end
 
     it "should perform with #select and #order" do
       result = Car.select("name as foo".lit).order(:name).paginate(1, 2).all