fixing ibm db

lib/arel/visitors/ibm_db.rb

@@ -3,8 +3,10 @@ module Arel
     class IBM_DB < Arel::Visitors::ToSql
       private
 
-      def visit_Arel_Nodes_Limit o
-        "FETCH FIRST #{visit o.expr } ROWS ONLY"
+      def visit_Arel_Nodes_Limit o, collector
+        collector << "FETCH FIRST "
+        collector = visit o.expr, collector
+        collector << " ROWS ONLY"
       end
 
     end

test/visitors/test_ibm_db.rb

@@ -7,10 +7,14 @@ module Arel
         @visitor = IBM_DB.new Table.engine.connection
       end
 
+      def compile node
+        @visitor.accept(node, Collectors::SQLString.new).value
+      end
+
       it 'uses FETCH FIRST n ROWS to limit results' do
         stmt = Nodes::SelectStatement.new
         stmt.limit = Nodes::Limit.new(1)
-        sql = @visitor.accept(stmt)
+        sql = compile(stmt)
         sql.must_be_like "SELECT FETCH FIRST 1 ROWS ONLY"
       end
 
@@ -20,7 +24,7 @@ module Arel
         stmt.relation = table
         stmt.limit = Nodes::Limit.new(Nodes.build_quoted(1))
         stmt.key = table[:id]
-        sql = @visitor.accept(stmt)
+        sql = compile(stmt)
         sql.must_be_like "UPDATE \"users\" WHERE \"users\".\"id\" IN (SELECT \"users\".\"id\" FROM \"users\" FETCH FIRST 1 ROWS ONLY)"
       end