totally lame, but arel expects FROM to only be one item

lib/arel/nodes/select_core.rb

 module Arel
   module Nodes
     class SelectCore
-      attr_reader :froms, :projections, :wheres, :groups
+      attr_accessor :froms, :projections, :wheres, :groups
       attr_accessor :having
 
       def initialize

lib/arel/select_manager.rb

@@ -51,11 +51,7 @@ def group *columns
     end
 
     def from table
-      if String === table
-        return self if @ctx.froms.any? { |x| x.name.to_s == table }
-      end
-
-      @ctx.froms << table
+      @ctx.froms = [table]
       self
     end
 

spec/arel/select_manager_spec.rb

@@ -60,7 +60,7 @@ def execute sql, name = nil
           manager.from table
           manager.from 'users'
           manager.project table['id']
-          manager.to_sql.should be_like 'SELECT "users"."id" FROM "users"'
+          manager.to_sql.should be_like 'SELECT "users"."id" FROM \'users\''
         end
       end