Use symbol instead of string
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@ -39,7 +39,7 @@ end
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class FileInput < SimpleForm::Inputs::FileInput
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def input_html_classes
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super.delete_if { |html_class| html_class == 'file' }
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super.delete_if { |html_class| html_class == :file }
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super.push('file-upload')
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end
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end
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