# File activesupport/lib/active_support/core_ext/hash/deep_merge.rb, line 16
def deep_merge!(other_hash, &block)
other_hash.each_pair do |k,v|
tv = self[k]
if tv.is_a?(Hash) && v.is_a?(Hash)
self[k] = tv.deep_merge(v, &block)
else
self[k] = block && tv ? block.call(k, tv, v) : v
end
end
self
end