AND nodes are supported

lib/arel/nodes.rb

@@ -1,6 +1,7 @@
 require 'arel/nodes/binary'
 require 'arel/nodes/equality'
 require 'arel/nodes/or'
+require 'arel/nodes/and'
 
 require 'arel/nodes/in'
 require 'arel/nodes/count'

lib/arel/nodes/and.rb

@@ -0,0 +1,6 @@
+module Arel
+  module Nodes
+    class And < Arel::Nodes::Binary
+    end
+  end
+end

lib/arel/nodes/binary.rb

@@ -12,6 +12,10 @@ module Arel
         Nodes::Or.new self, right
       end
 
+      def and right
+        Nodes::And.new self, right
+      end
+
       # FIXME: this method should go away.  I don't like people calling
       # to_sql on non-head nodes.  This forces us to walk the AST until we
       # can find a node that has a "relation" member.

lib/arel/visitors/to_sql.rb

@@ -86,6 +86,10 @@ module Arel
         "#{visit o.left} IN (#{o.right.map { |x| visit x }.join ', '})"
       end
 
+      def visit_Arel_Nodes_And o
+        "#{visit o.left} AND #{visit o.right}"
+      end
+
       def visit_Arel_Nodes_Or o
         "#{visit o.left} OR #{visit o.right}"
       end

spec/arel/nodes/equality_spec.rb

@@ -11,6 +11,17 @@ module Arel
           check node.right.should == right
         end
       end
+
+      describe 'and' do
+        it 'makes and AND node' do
+          attr = Table.new(:users)[:id]
+          left  = attr.eq(10)
+          right = attr.eq(11)
+          node  = left.and right
+          check node.left.should == left
+          check node.right.should == right
+        end
+      end
     end
   end
 end

spec/arel/visitors/to_sql_spec.rb

@@ -8,6 +8,13 @@ module Arel
         @attr = Table.new(:users)[:id]
       end
 
+      it "should visit_Arel_Nodes_And" do
+        node = Nodes::And.new @attr.eq(10), @attr.eq(11)
+        @visitor.accept(node).should be_like %{
+          "users"."id" = 10 AND "users"."id" = 11
+        }
+      end
+
       it "should visit_Arel_Nodes_Or" do
         node = Nodes::Or.new @attr.eq(10), @attr.eq(11)
         @visitor.accept(node).should be_like %{