Ruby 2-D array

I have class A.
I have a class B with attributes c and d.
A has many Bs.

I get an instance of A using
a = find_by....

I can get a listing (enumeration) of values for attribute b using map
function.

   a.b.map{ |x| x.c}

c1
c2
c3

However, I want c and d returned and paired together in an array like a
2-d array.

c1  d1
c2  d2
c3  c3

What's the best way to do this?  Map won't work, correct?
lcorAsked:
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roshkinsConnect With a Mentor Commented:
So you're very close. What you want to do is this:
a.b.map{ |x| [x.c, x.d] }

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This will result in an array of arrays, which is what you seem to want.
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