39 lines
1.1 KiB
Ruby
39 lines
1.1 KiB
Ruby
# frozen_string_literal: true
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module ArrayAttribute
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extend ActiveSupport::Concern
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class_methods do
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# Defines `<attribute>_string`, `<attribute>_string=`, and `<attribute>=`
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# methods for converting an array attribute to or from a string.
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#
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# The `<attribute>=` setter parses strings into an array using the
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# `parse` regex. The resulting strings can be converted to another type
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# with the `cast` option.
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def array_attribute(name, parse: /[^[:space:]]+/, cast: :itself)
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mod = Module.new do
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define_method "#{name}_string" do
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send(name).join(" ")
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end
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define_method "#{name}_string=" do |value|
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raise ArgumentError, "#{name} must be a String" unless value.respond_to?(:to_str)
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send("#{name}=", value)
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end
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define_method "#{name}=" do |value|
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if value.respond_to?(:to_str)
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super value.to_str.scan(parse).map(&cast)
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elsif value.respond_to?(:to_a)
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super value.to_a
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else
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raise ArgumentError, "#{name} must be a String or an Array"
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end
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end
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end
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prepend mod
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end
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end
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end
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