Enum, Joins, or Strings

[idi527]

@cnck1387

The ecto enum lib is quite nice for this because you can reference your values as :fixed or :percent in the code base, so it retains readability.

It’s possible with approach 1. as well by providing a custom ecto type for the field

schema "cars" do
  field :condition_name, CarCondition
end

The code for CarCondition would be the same as for an enum except for type/0 callback (:string instead of enum name), so ecto enum could probably be used as well.