Adding with() blocks so we avoid the ugliness of assigning values in the if comparisons in Ruby.

ruby-with-blocks.rb

# ==with
#
# We have been struggling with the absence of @with@ blocks
# in Ruby for a long time. We had something similar in 
# Object Pascal.
#
# Let me explain what it does:
#
#    with Invoice.find_by_id(params[:id]) do |invoice|
#      puts invoice.total
#    end
#
#  and essentially this resolved to how we used to
#  to things in Ruby:
#
#    if invoice = Invoice.find_by_id(params[:id])
#      invoice.total
#    end
#
# See: http://bit.ly/14iimBe, page 93
#
def with(evaluated_object, &block)
  yield(evaluated_object) if evaluated_object
end

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