fix for sqlite not supporting drop table cascade

Author: robertwahler

lib/rails_sql_views/connection_adapters/abstract/schema_statements.rb

@@ -59,7 +59,9 @@ def create_mapping_view(old_name, new_name, options = {})
       end
 
       def drop_table_with_cascade(table_name, options = {})
-        execute "DROP TABLE #{quote_table_name(table_name)} CASCADE"
+        cmd = "DROP TABLE #{quote_table_name(table_name)}"
+        cmd += " CASCADE" if supports_drop_table_cascade?
+        execute cmd
       end
 
       # Drop a view.

lib/rails_sql_views/connection_adapters/abstract_adapter.rb

@@ -9,6 +9,11 @@ def self.included(base)
       def supports_views?
         return false
       end
+
+      # Subclasses should override and return false if they don't support CASCADE
+      def supports_drop_table_cascade?
+        return true
+      end
 
       def disable_referential_integrity_with_views_excluded(&block)
         self.class.send(:alias_method, :original_tables_method, :tables)

lib/rails_sql_views/connection_adapters/sqlite_adapter.rb

@@ -4,6 +4,10 @@ module SQLiteAdapter
       def supports_views?
         true
       end
+
+      def supports_drop_table_cascade?
+        return false 
+      end
 
       def tables(name = nil) #:nodoc:
         sql = <<-SQL