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Simple drop-in refinements module that replicates Rails's presence methods
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| # frozen_string_literal: true | |
| module PresenceRefinements | |
| refine Object do | |
| def blank? = (respond_to?(:empty?) ? !!empty? : !self) | |
| def present? = !blank? | |
| def presence = (self if present?) | |
| end | |
| # This bit is cribbed from https://github.com/rpanachi/core_ext | |
| refine String do | |
| BLANK_RE = /\A[[:space:]]*\z/ | |
| ENCODED_BLANKS = Hash.new do |h, enc| | |
| h[enc] = Regexp.new(BLANK_RE.source.encode(enc), BLANK_RE.options | Regexp::FIXEDENCODING) | |
| end.freeze | |
| def blank? | |
| empty? || begin | |
| BLANK_RE.match?(self) | |
| rescue Encoding::CompatibilityError | |
| ENCODED_BLANKS[self.encoding].match?(self) | |
| end | |
| end | |
| end | |
| end |
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| # frozen_string_literal: true | |
| require 'presence_refinements' | |
| using PresenceRefinements | |
| ["", " ", "\u00a0", "hi", nil, false, true, [], {}, %w[a b], { a: 1 }, 0, 1].each do |value| | |
| puts "#{value.inspect}.blank? => #{value.blank?.inspect}, #{value.inspect}.presence => #{value.presence.inspect}" | |
| end |
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