adding joins method to Table

lib/arel/table.rb

@@ -26,6 +26,10 @@ module Arel
       SelectManager.new(@engine).from(self)
     end
 
+    def joins manager
+      nil
+    end
+
     def join relation
       sm = SelectManager.new(@engine)
       case relation

spec/arel/table_spec.rb

@@ -6,6 +6,14 @@ module Arel
       @relation = Table.new(:users)
     end
 
+    describe 'backwards compat' do
+      describe 'joins' do
+        it 'returns nil' do
+          check @relation.joins(nil).should == nil
+        end
+      end
+    end
+
     describe 'alias' do
       it 'should create a node that proxies to a table' do
         check @relation.aliases.should == []