How To retrieve flickr photos meta data in a 2021 Stylee! Been doing this since September 2010! Now with Ruby 3.0 'except'

I started using the flickr API in September 2010: See getGastownPhotos.rb! 11 years can you believe it?!?
Here’s how I do it in 2021!
- Use Ruby 3.0 with the new Hash#except method to exclude members of a hash table in order to flatten a json structure so it can be converted to CSV.
- Output is CSV not mongodb so it can be used in R and converted to SQLite:
  - My 2020 flickr photo metadata
  - My 2019 flickrphoto metadata

Some technical details

You will of course need your flickr api key which you can find at:
- https://www.flickr.com/services/apps/by/<yourid>
backup-RolandsPublicPhotoMetaDataByYear.rb flattens the JSON output from the flickr API. Luckily there’s only 1 thing that has to be flattened which is:
photo["description"]["_content"] which is flattened to photo["description_content"]

bundle install
bundle exec ./backup-RolandsPublicPhotoMetaDataByYear.rb 2020 # output: 2020-roland-flickr-metadata.csv
bundle exec ./backup-RolandsPublicPhotoMetaDataByYear.rb 2019 # output: 2019-roland-flickr-metadata.csv