Return a hash that includes everything but the given keys. This is useful for limiting a set of parameters to everything but a few known toggles:

@person.update_attributes(params[:person].except(:admin))
Methods
E
Instance Public methods
except(*keys)

Returns a new hash without the given keys.

# File activesupport/lib/active_support/core_ext/hash/except.rb, line 12
def except(*keys)
  dup.except!(*keys)
end
except!(*keys)

Replaces the hash without the given keys.

# File activesupport/lib/active_support/core_ext/hash/except.rb, line 17
def except!(*keys)
  keys.map! { |key| convert_key(key) } if respond_to?(:convert_key)
  keys.each { |key| delete(key) }
  self
end