Module: ActiveSupport::CoreExtensions::Hash::Slice
- Included in:
- Hash
- Defined in:
- lib/active_support/core_ext/hash/slice.rb
Overview
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(.slice(:mass, :velocity, :time))
Instance Method Summary collapse
-
#slice(*keys) ⇒ Object
Returns a new hash with only the given keys.
-
#slice!(*keys) ⇒ Object
Replaces the hash with only the given keys.
Instance Method Details
#slice(*keys) ⇒ Object
Returns a new hash with only the given keys.
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# File 'lib/active_support/core_ext/hash/slice.rb', line 16 def slice(*keys) allowed = Set.new(respond_to?(:convert_key) ? keys.map { |key| convert_key(key) } : keys) reject { |key,| !allowed.include?(key) } end |
#slice!(*keys) ⇒ Object
Replaces the hash with only the given keys.
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# File 'lib/active_support/core_ext/hash/slice.rb', line 22 def slice!(*keys) replace(slice(*keys)) end |