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Devise Error Messages with Bootstrap 3 style
# /app/helpers/devise_helper.rb
module DeviseHelper
def devise_error_messages!
return '' if resource.errors.empty?
messages = resource.errors.full_messages.map { |msg| content_tag(:li, msg) }.join
sentence = I18n.t('errors.messages.not_saved',
count: resource.errors.count,
resource: resource.class.model_name.human.downcase)
html = <<-HTML
<div class="alert alert-danger">
<button type="button" class="close" data-dismiss="alert">x</button>
<h4>#{sentence}</h4>
#{messages}
</div>
HTML
html.html_safe
end
end
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