method

except

v4.2.7 - Show latest stable - Class: Hash

except(*keys)

public

Returns a hash that includes everything but the given keys.

hash = { a: true, b: false, c: nil}
hash.except(:c) # => { a: true, b: false}
hash # => { a: true, b: false, c: nil}

This is useful for limiting a set of parameters to everything but a few known toggles:

@person.update(params[:person].except(:admin))

# File activesupport/lib/active_support/core_ext/hash/except.rb, line 9
  def except(*keys)
    dup.except!(*keys)
  end

joshuapinter · May 1, 20142 thanks

Use the "*" before passing the array in. For example:

PARAMS_TO_SCRUB = [ :created_at, :updated, :id, :format ]

params.except!( *PARAMS_TO_SCRUB )