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vendor/rails/activesupport/lib/active_support/core_ext/hash/except.rb

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require 'set'

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module ActiveSupport #:nodoc:

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  module CoreExtensions #:nodoc:

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    module Hash #:nodoc:

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      # Return a hash that includes everything but the given keys. This is useful for

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      # limiting a set of parameters to everything but a few known toggles:

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      #

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      #   @person.update_attributes(params[:person].except(:admin))

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      module Except

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        # Returns a new hash without the given keys.

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        def except(*keys)

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          dup.except!(*keys)

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        end

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        # Replaces the hash without the given keys.

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        def except!(*keys)

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          keys.map! { |key| convert_key(key) } if respond_to?(:convert_key)

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          keys.each { |key| delete(key) }

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          self

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        end

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      end

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    end

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  end

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end

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