Rails already defines a PDF mime type (remove warning).
Rails already defines a PDF mime type (remove warning).

$ rails c
>> Mime::EXTENSION_LOOKUP.select { |k, _| k == 'pdf' }
=> {"pdf"=>#<Mime::Type:0x007fb0c2414ba8 @synonyms=[], @symbol=:pdf, @string="application/pdf">}

d2bit/timeoverflow,jordipujollarena/timeoverflow,coopdevs/timeoverflow,coopdevs/timeoverflow,d2bit/timeoverflow,coopdevs/timeoverflow,d2bit/timeoverflow,d2bit/timeoverflow,coopdevs/timeoverflow,jordipujollarena/timeoverflow,jordipujollarena/timeoverflow