params.txt

[1] pry(#<CsvsController>)> params
=> <ActionController::Parameters {"null"=>"", "file"=>#<ActionDispatch::Http::UploadedFile:0x007fe20cbbec98 @tempfile=#<Tempfile:/tmp/RackMultipart20170405-26867-13irnim.pdf>, @original_filename="MattQuintoResume.pdf", @content_type="application/pdf", @headers="Content-Disposition: form-data; name=\"file\"; filename=\"MattQuintoResume.pdf\"\r\nContent-Type: application/pdf\r\n">, "controller"=>"csvs", "action"=>"save_csv"} permitted: false>

[2] pry(#<CsvsController>)> params['file']
=> #<ActionDispatch::Http::UploadedFile:0x007fe20cbbec98
 @content_type="application/pdf",
 @headers="Content-Disposition: form-data; name=\"file\"; filename=\"MattQuintoResume.pdf\"\r\n" + "Content-Type: application/pdf\r\n",
 @original_filename="MattQuintoResume.pdf",
 @tempfile=#<File:/tmp/RackMultipart20170405-26867-13irnim.pdf>>

uploader.rb

class CsvUploader < CarrierWave::Uploader::Base
  # Include RMagick or MiniMagick support:
  # include CarrierWave::RMagick
  # include CarrierWave::MiniMagick

  # Choose what kind of storage to use for this uploader:
  # storage :file
    storage :fog

  # Override the directory where uploaded files will be stored.
  # This is a sensible default for uploaders that are meant to be mounted:
  def store_dir
    "uploads/csv"
  end

  # Provide a default URL as a default if there hasn't been a file uploaded:
  # def default_url
  #   # For Rails 3.1+ asset pipeline compatibility:
  #   # ActionController::Base.helpers.asset_path("fallback/" + [version_name, "default.png"].compact.join('_'))
  #
  #   "/images/fallback/" + [version_name, "default.png"].compact.join('_')
  # end

  # Process files as they are uploaded:
  # process scale: [200, 300]
  #
  # def scale(width, height)
  #   # do something
  # end

  # Create different versions of your uploaded files:
  # version :thumb do
  #   process resize_to_fit: [50, 50]
  # end

  # Add a white list of extensions which are allowed to be uploaded.
  # For images you might use something like this:
  # def extension_whitelist
  #   %w(jpg jpeg gif png)
  # end

  # Override the filename of the uploaded files:
  # Avoid using model.id or version_name here, see uploader/store.rb for details.
  # def filename
  #   "something.jpg" if original_filename
  # end

end