Question 1

How do I upload multiple files with Flask-File-Upload?

Accepted Answer

Use the add_files method with a dictionary mapping model attributes to file objects from request.files. For example, file_upload.add_files(blog_post, files={'image1': file1, 'image2': file2}). Ensure your model is decorated with @file_upload.Model and columns are defined.

Question 2

Flask-File-Upload vs Flask-Uploads: which is better for SQLAlchemy projects?

Accepted Answer

Flask-File-Upload is better for tight SQLAlchemy integration as it automatically manages database schema and file storage sync. Flask-Uploads is more generic and doesn't handle database records, so choose Flask-File-Upload if you need seamless database coupling.

Question 3

Can Flask-File-Upload handle video streaming?

Accepted Answer

Yes, it includes a stream_file method that streams files like videos directly from server storage. You need to configure MIME types and ensure your Flask app handles streaming responses appropriately for different file formats.

Question 4

How to set allowed file extensions in Flask-File-Upload?

Accepted Answer

Configure the ALLOWED_EXTENSIONS list in Flask's app.config before initializing FileUpload. For example, set app.config['ALLOWED_EXTENSIONS'] = ['jpg', 'png', 'mp4']. This is checked during file upload operations.

Question 5

What are common pitfalls when using Flask-File-Upload?

Accepted Answer

Common issues include not aligning UPLOAD_FOLDER with Flask's static_folder, skipping migration steps after adding file columns, and using lazy='dynamic' in relationships. Always run Flask-Migrate commands and follow setup instructions closely.

Question 6

Does Flask-File-Upload support file deletion with cleanup?

Accepted Answer

Yes, use the delete_files method with options like clean_up='files' to remove server files or clean_up='model' to update the database. It allows partial cleanup, but you must specify files and handle transactions carefully to avoid orphaned data.

Flask-File-Upload

What is Flask-File-Upload?

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