From 57f8844b469d154e8c7f9be357dc1e96e982343d Mon Sep 17 00:00:00 2001
From: Lefteris Laskaridis <l.laskaridis@pamediakopes.gr>
Date: Thu, 5 Sep 2013 15:13:45 +0300
Subject: [PATCH] Fixes missing #uses_sequence invokation in adapter classes
 for sqlite and sqlite3

---
 .../data_mapper/truncation.rb                 | 24 +++++++++++++++++--
 1 file changed, 22 insertions(+), 2 deletions(-)

diff --git a/lib/database_cleaner/data_mapper/truncation.rb b/lib/database_cleaner/data_mapper/truncation.rb
index 1198632..98207b5 100644
--- a/lib/database_cleaner/data_mapper/truncation.rb
+++ b/lib/database_cleaner/data_mapper/truncation.rb
@@ -53,7 +53,7 @@ module DataMapper
 
       def truncate_table(table_name)
         execute("DELETE FROM #{quote_name(table_name)};")
-        if uses_sequence
+        if uses_sequence?
           execute("DELETE FROM sqlite_sequence where name = '#{table_name}';")
         end
       end
@@ -65,6 +65,16 @@ module DataMapper
         yield
       end
 
+      private
+
+      def uses_sequence?
+        sql = <<-SQL
+          SELECT name FROM sqlite_master
+          WHERE type='table' AND name='sqlite_sequence'
+        SQL
+        select(sql).first
+      end
+
     end
 
     class SqliteAdapter < DataObjectsAdapter
@@ -82,7 +92,7 @@ module DataMapper
 
       def truncate_table(table_name)
         execute("DELETE FROM #{quote_name(table_name)};")
-        if uses_sequence
+        if uses_sequence?
           execute("DELETE FROM sqlite_sequence where name = '#{table_name}';")
         end
       end
@@ -94,6 +104,16 @@ module DataMapper
         yield
       end
 
+      private
+
+      def uses_sequence?
+        sql = <<-SQL
+          SELECT name FROM sqlite_master
+          WHERE type='table' AND name='sqlite_sequence'
+        SQL
+        select(sql).first
+      end
+
     end
 
     # FIXME