jbuilder

https://github.com/rails/jbuilder

Ruby

Jbuilder: generate JSON objects with a Builder-style DSL

Jbuilder#ignore_nil!

If you want to skip adding nil values to your JSON hash. This is useful
for JSON clients that don't deal well with nil values, and would prefer
not to receive keys which have null values.

Example:
  json.ignore_nil! false
  json.id User.new.id

  { "id": null }

  json.ignore_nil!
  json.id User.new.id

  {}

Source | Google | Stack overflow

Edit

git clone [email protected]:rails/jbuilder.git
cd jbuilder
open lib/jbuilder.rb

Contribute

# Make a new branch

git checkout -b -your-name--update-docs-Jbuilder-ignore_nil--for-pr

# Commit to git

git add lib/jbuilder.rbgit commit -m "better docs for Jbuilder#ignore_nil!"

# Open pull request

gem install hub # on a mac you can `brew install hub`

hub fork

git push <your name> -your-name--update-docs-Jbuilder-ignore_nil--for-pr

hub pull-request

# Celebrate!