git log --pretty=oneline gives you the one-line per a commit output.
git log --pretty=format:"%an" gives you formatting on commits. All the
interpolations available are listed in the
man git-log under “PRETTY FORMATS”.
attr_readonly exists in Rails for making fields immutable. But we’re in Rails,
so we don’t use big words like immutable, we use readonly. Caveat: you can still
change the values in memory, which has other consequences around validations and
any derived values.