Can I use a user variable as fl_attahcment filename?

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Leo Gernovski

• February 10, 2021 03:32

I have a PDF file in my media library that I want to download as an attachment with a filename determined by its context variable "filename".

Everything works fine if I use a static filename in fl_attachment like this:

...../fl_attachment:my-file-name/I1589983424082.pdf

However, I get an error when I am trying to do something like this:

...../$filename_ctx:!filename!/fl_attachment:$filename/I1589983424082.pdf

Is the variable expansion supported in fl_attachment at all?

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  Stephen Doyle

  • February 10, 2021 11:08
  • Edited

  Hi Leo,

  It's not possible to use variables with the 'attachment' flag; Only some transformation options support variables, and there's a list in the documentation here: https://cloudinary.com/documentation/user_defined_variables#variable_types_and_supported_parameters

  To set the attachment name based on a value stored in the asset's context, there are two possible ways to make it work:

  • Use the Admin API to periodically synchronise your database with the assets' metadata, then add the filename to the URL based on that value from your database: https://cloudinary.com/documentation/admin_api#get_resources
  • If it must happen in client-side code and the asset has a unique tag or is one of a small number of assets sharing a tag, load the asset's metadata in your code using a client-side resource list (which includes the context values), and use that to set the filename: https://cloudinary.com/documentation/advanced_url_delivery_options#client_side_asset_lists

  If you need any examples of either method, or if there's anything else I can help with, please let me know

  Regards,

  Stephen

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  Leo Gernovski

  • February 10, 2021 13:20

  Thank you, Stephen! The information on client-side resource list is very useful.

  Leo.

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  Stephen Doyle

  • February 11, 2021 11:56

  You're welcome; please let us know if you need anything else

  -Stephen

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