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

In case you want to add few keys under single condition, you can use merge:

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

if condition
  hash.merge!(
    :key5 => value4,
    :key5 => value5,
    :key6 => value6
  )
end

hash