ruby on rails - How to handle a file_as_string (generated by Prawn) so that it is accepted by Carrierwave? -

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i'm using prawn generate pdf controller of rails app,

... respond_to |format|   format.pdf     pdf = generatereportpdf.new(@object, view_context)     send_data pdf.render, filename: "report", type: "application/pdf", disposition: "inline"   end end

this works fine, want move generatereportpdf background task, , pass resulting object carrierwave upload directly s3.

the worker looks this

def perform   pdf           = generatereportpdf.new(@object)   filestring    = ???????   document      = document.new(     object_id: @object.id,     file: filestring )     # file field used carrierwave  end

how handle object returned prawn (?????) ensure format can read carrierwave.

filestring = pdf.render_file 'filename' writes object root directory of app. i'm on heroku not possible.

file = pdf.render returns argumenterror: string contains null byte

filestring = stringio.new( pdf.render_file 'filename' ) returns typeerror: no implicit conversion of nil string

filestring = stringio.new( pdf.render ) returns activerecord::recordinvalid: validation failed: file not allowed upload nil files, allowed types: jpg, jpeg, gif, png, pdf, doc, docx, xls, xlsx

filestring = file.open( pdf.render ) returns argumenterror: string contains null byte

....and on.

what missing? stringio.new( pdf.render ) seems should work, i'm unclear why generating error.

it turns out stringio.new( pdf.render ) should indeed work.

the problem having filename being set incorrectly and, despite following advise below on carrierwave's wiki, bug elsewhere in code meant filename returning empty string. i'd overlooked assumed else needed

https://github.com/carrierwaveuploader/carrierwave/wiki/how-to:-upload-from-a-string-in-rails-3

my code ended looking this

def perform   s = stringio.new(pdf.render)    def s.original_filename; "my file name"; end    document  = document.new(     object_id: @object.id   )    document.file = s    document.save! end

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