On Sat, Sep 10, 2011 at 21:51, Dave Aronson
<googlegroups2d...@davearonson.com> wrote:
> Try this:
>
> u.matches.index { |match| match.user_id == 2 } == nil
On rereading this and then seeing the thread on asking questions,
methinks I ought to talk a bit about how I came up with this, and how
the rest of you can do likewise when stuck in a simliar situation as
the OP. As you may recall, he wanted to use find, but the method
returned an Array, which doesn't have a find method.
I figured, there's *got* to be *some* useful method on Array. There
wasn't one that I immediately recalled offhand. So I went to the docs
for the Array class, and looked at the methods. Of course there were
things like map/collect, that could be used to loop over it and return
true if it found a match or false if it hit the end, or select that
could be used to construct an array of "hit" elements. But I figured
there was probably a cleaner solution, that would still be clear and
concise, as a one-liner. I didn't know index would take a block...
and stumbling across that was the key.
Upshot: if you want to use method X, that works on class A, but you're
stuck with class B, take a quick stroll through the methods on B, and
see if there's something that can at least be used in a similar way.
If not, maybe there's even something better -- you don't have to solve
all similar problems the exact same way.
-Dave
--
Main Web Site: davearonson.com | LOOKING FOR WORK,
Programming Blog: codosaur.us | preferably RoR, in NoVa/DC;
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