/ Ruby on Rails
/
method

except

v5.2.3 - Show latest stable - Class: Hash
except(*keys)
public

Returns a hash that includes everything except given keys.

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

1Note

Passing an array of keys to exclude.

joshuapinter ยท 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 )