https://github.com/drnic/composite_primary_keys/issues/148

diff --git a/lib/composite_primary_keys/relation/batches.rb b/lib/composite_primary_keys/relation/batches.rb
index 8a93960..38b6c9c 100644
--- a/lib/composite_primary_keys/relation/batches.rb
+++ b/lib/composite_primary_keys/relation/batches.rb
@@ -23,7 +23,13 @@ module CompositePrimaryKeys
         # CPK
         #records = relation.where(table[primary_key].gteq(start)).all
         self.primary_key.each do |key|
-          relation = relation.where(table[key].gteq(start))
+          condition = case relation.columns_hash[key.to_s].type
+            when :string
+              table[key].not_eq ''
+            when :integer
+              table[key].gteq start
+          end
+          relation = relation.where(condition)
         end
         records = relation.all

diff --git a/test/fixtures/db_definitions/postgresql.sql b/test/fixtures/db_definitions/postgresql.sql
index 1990124..6e507a3 100644
--- a/test/fixtures/db_definitions/postgresql.sql
+++ b/test/fixtures/db_definitions/postgresql.sql
@@ -192,3 +192,11 @@ create table employees_groups (
   employee_id int not null,
   group_id int not null
 );
+
+create table titles (
+    entity character varying(255),
+    entity_id integer,
+    lang_id integer,
+    title text,
+    primary key (entity, entity_id, lang_id)
+);
\ No newline at end of file
diff --git a/test/fixtures/title.rb b/test/fixtures/title.rb
new file mode 100644
index 0000000..a11b726
--- /dev/null
+++ b/test/fixtures/title.rb
@@ -0,0 +1,5 @@
+class Title < ActiveRecord::Base
+  belongs_to :user
+  attr_accessible :entity, :entity_id, :title
+  self.primary_keys = :entity, :entity_id, :lang_id
+end
diff --git a/test/fixtures/titles.yml b/test/fixtures/titles.yml
new file mode 100644
index 0000000..8df48e4
--- /dev/null
+++ b/test/fixtures/titles.yml
@@ -0,0 +1,11 @@
+title_1:
+  entity: 'agelimits'
+  entity_id: 1
+  lang_id: 1
+  title: '16+'
+
+title_2:
+  entity: 'shows'
+  entity_id: 1
+  lang_id: 1
+  title: 'Second'
diff --git a/test/test_different_types.rb b/test/test_different_types.rb
new file mode 100644
index 0000000..b9dbc51
--- /dev/null
+++ b/test/test_different_types.rb
@@ -0,0 +1,11 @@
+require File.expand_path('../abstract_unit', __FILE__)
+
+class TestDifferentTypes < ActiveSupport::TestCase
+  fixtures :titles
+
+  def test_find_each
+    title = ''
+    Title.where( entity: 'agelimits' ).find_each { |i| title = i.title }
+    assert_equal( title, '16+' )
+  end
+end
\ No newline at end of file