Rails how to know when send_file

Question

Since it takes some time to prepare the contents of the downloaded data, I want to show the message "Preparing the file for downloading" when the user sends a request

Then, when the file is ready, I use send_file to send the data

Once this is done, I need to clear the message

Thank you so much

Answer 1

Here is what I will do.

1. Create a prepare_file action

Firstly, I would create an action whose task would be to simply create a file and not display HTML, it will display a JSON object with the name of the created file.

2. Use AJAX to invoke the prepare_file action

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