We're not adding the rule because it would apply the current line length
rule of 110 characters per line. We still haven't decided whether we'll
keep that rule or make lines shorter so they're easier to read,
particularly when vertically splitting the editor window.
So, for now, I'm applying the rule to lines which are about 90
characters long.
We were very inconsistent regarding these rules.
Personally I prefer no empty lines around blocks, clases, etc... as
recommended by the Ruby style guide [1], and they're the default values
in rubocop, so those are the settings I'm applying.
The exception is the `private` access modifier, since we were leaving
empty lines around it most of the time. That's the default rubocop rule
as well. Personally I don't have a strong preference about this one.
[1] https://rubystyle.guide/#empty-lines-around-bodies
Slugs should only be updated on certain conditions, we need a trait that
meets that conditions and the name of the trait passed as a mandatory &
named argument on the sluggable concern
Why:
* We need certain models that use a Sluggable to generate a slug based on name attribute on save
How:
* Creating a shared example that knows how to create a factory of the described class
* Checking in it that new objects of the described class get the correct slug
