<p>I have</p>

<pre><code>class Foo &lt; ActiveRecord::Base
  named_scope :a, lambda { |a| :conditions =&gt; { :a =&gt; a } }
  named_scope :b, lambda { |b| :conditions =&gt; { :b =&gt; b } }
end
</code></pre>

<p>I'd like</p>

<pre><code>class Foo &lt; ActiveRecord::Base
  named_scope :ab, lambda { |a,b| :conditions =&gt; { :a =&gt; a, :b =&gt; b } }
end
</code></pre>

<p>but I'd prefer to do it in a DRY fashion.  I can get the same effect by using</p>

<pre><code> Foo.a(something).b(something_else)
</code></pre>

<p>but it's not particularly lovely.</p>

Well I'm still new to rails and I'm not sure exactly what you're going for here, but if you're just going for code reuse why not use a regular class method?
```
```
def self.ab(a, b)
            a(a).b(b)
        end
```
```
You could make that more flexible by taking *args instead of a and b, and then possibly make one or the other optional.  If you're stuck on named_scope, can't you extend it to do much the same thing?
Let me know if I'm totally off base with what you're wanting to do.