How do I break out of a map/collect and return whatever has been collected up to that point?

I'm rewriting this question in code:

many = 1000

# An expensive method.
#
# It returns some data or nil if no result is available.
expensive_method = lambda do
  rand(5) == 0 ? nil : "foo"
end

# Now, let's collect some data and stop collecting when no more data is
# available.

# This is concise but doesn't work.
collection = many.times.map do
  expensive_method.call || break
end

puts collection.is_a? Array # false

# This is less concise but works.
collection = []
many.times do
  collection << (expensive_method.call || break)
end

puts collection.is_a? Array # true

# My inner Rubyist ponders: Is it possible to accomplish this more concisely
# using map?