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panel/config/initializers/bootstrap_field_with_errors.rb

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# frozen_string_literal: true
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# Adaptar la renderización de campos con error de Rails para que sea
# compatible con Bootstrap4. La forma actual rompe los inputs
# personalizados.
ActionView::Base.field_error_proc = proc do |html_tag, _|
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return unless html_tag
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html = Nokogiri::HTML::DocumentFragment.parse html_tag
html&.children&.first&.attributes&.dig('class')&.value += ' is-invalid'
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html&.to_s&.html_safe || html_tag
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end