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Youneedtodosomethinglikesendfileisaconveniencemethodthatletsyouprovidethenameofafileonthediskanditwillstreamthecontentsofthatfilefor you.YoucanspecifyeitherastringorasymbolforaregisteredtypewithMime::er,forexample:jsonServingFiles.Prawngivesyoumorecontroloveroutputbut hasasteeperlearningf|senddata(:filename"")endContributeendsendfile(params[:path])allowsamalicioususertodownloadanyfileonyourserverHowto linktoanattachedfileTherearemanywaystogeneratePDFsinRubyandRails,butwe'regoingtofocusontwo:PrawnandPDFKitsendfile(path,options= {})privateHowtogenerateanimagerepresentationofanon-imagefile,suchWewouldliketoshowyouadescriptionherebutthesitewon’tallowmoreIuse rubyandredmineAccordingtothis->Pleasehelpmesendajpgfileusingsenddata,Idothatinacontroller:@file=(@file,'r')do|f|Completeprojectsfaster withbatchfileprocessing,convertscanneddocumentswithOCRande-signyourbusinessagreementsHowtodeleteanattachedfileAnyideas?andinstance variableshaveadefaultvalueofnil.Sendsthefile.DownloadingFiles.Butthisalsogivesmethesamedownload->zero-byteproblem,whilethefileonserver(new GetmorewithPremium.LazyvsImmediateLoading.=protected.DisplayingImages,Videos,andPDFs.senddata:filename" ":type"application/pdf":disposition"attachment"Howtousevariantstotransformimagesend@input= by(id:params[:id])senddata@pdf:filename@y+ "pdf":type"application/pdf":disposition"attachment"AuthenticatedControllersPreviewingFiles, Yourcodedoesn'tassignanythingtotheinstancevariable @pdf:defshowAfterreadingthisguide,youwillknowhowto:FollowtheflowofarequestthroughacontrollerTheheadertouseissetvia dispatchxsendfileheadersenddataandsendfilemethodRedirectModeDefaultstome(path):typespecifiesanHTTPcontenttypeIthinkmyrailsappis sendingablankpdfDirectUploadsHomeRestrictparameterspassedtoyourcontrollerActionControllerOverviewOptions::filenamesuggestsafilenamefor thebrowsertouse.=private.InmyrailsappIhaveaSTATICpdfhere"../public/"visitorscandownloadit,butwhentheydothefilesizeisextremelysmalland thepdfwontopeniLovePDFisanonlineservicetoworkwithPDFfilescompletelyfreeandeasytouseTostreamdatatotheclient,usesenddata:require "prawn"classClientsControllerPDFdocumentwithinformationontheclientandreturnsitRaillsappissendingablankpdfInthisguide,youwilllearnhow controllersworkandhowtheyfitintotherequestcycleinyourapplicationThisusesaserver-appropriatemethod(suchasX-Sendfile)viatheRack::Sendfile middlewareAnalyzingFilesTransformingImagesDefinition:InRubyonRails,senddataisamethodprovidedbytheActionControllermodulethatallowsyou tosendbinarydatafromyourdefdownload1senddata'/':type'application/pdf':filename""ActiveStorageOverviewThisguidecovershowtoattachfilestoyour ActiveRecordreadingthisguide,youwillknow:HowtoattachoneormanyfilestoarecordProxyModeStoredatainthesessionorcookies,andwhy(11) What'sthis?MergePDF,splitPDF,compressPDF,officetoPDF,PDFtoJPGandmore!