/usr/lib/ruby/vendor_ruby/active_support/core_ext/hash/slice.rb is in ruby-activesupport-3.2 3.2.16-2.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 | class Hash
# Slice a hash to include only the given keys. This is useful for
# limiting an options hash to valid keys before passing to a method:
#
# def search(criteria = {})
# assert_valid_keys(:mass, :velocity, :time)
# end
#
# search(options.slice(:mass, :velocity, :time))
#
# If you have an array of keys you want to limit to, you should splat them:
#
# valid_keys = [:mass, :velocity, :time]
# search(options.slice(*valid_keys))
def slice(*keys)
keys = keys.map! { |key| convert_key(key) } if respond_to?(:convert_key, true)
hash = self.class.new
keys.each { |k| hash[k] = self[k] if has_key?(k) }
hash
end
# Replaces the hash with only the given keys.
# Returns a hash contained the removed key/value pairs
# {:a => 1, :b => 2, :c => 3, :d => 4}.slice!(:a, :b) # => {:c => 3, :d => 4}
def slice!(*keys)
keys = keys.map! { |key| convert_key(key) } if respond_to?(:convert_key, true)
omit = slice(*self.keys - keys)
hash = slice(*keys)
replace(hash)
omit
end
# Removes and returns the key/value pairs matching the given keys.
# {:a => 1, :b => 2, :c => 3, :d => 4}.extract!(:a, :b) # => {:a => 1, :b => 2}
def extract!(*keys)
result = {}
keys.each {|key| result[key] = delete(key) }
result
end
end
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