Building a hash in a conditional way

Question

I am using Ruby on Rails 3.0.10 and I would like to build an hash key\\value pairs in a conditional way. That is, I would like to add a key and its related value if a condition

Answer 1

Same idea as Chris Jester-Young, with a slight readability trick

def cond(x)
  condition ? x : :delete_me
end

hash = {
  :key1 => value1,
  :key2 => cond(value2),
  :key3 => value3
}

and then postprocess to remove the :delete_me entries