Enums

Clear offers support of PG enum.
To define an enum, use the Clear.enum method:
# Define the enum
Clear.enum Gender, "male", "female"
This will create a new record called MyApp::Gender, which contains the constants Male and Female.
Validation, assignation
You can use the new type directly in your model:
class User
  include Clear::Model
  #...
​
  column gender : Gender
end
Assignation cannot be made from string, but instead from constants:
u = User.new
u.gender = MyApp::Gender::Male
List of helpers are present for validation and conversion from/to string:
MyApp::Gender.authorized_values # < return ["male", "female"]
MyApp::Gender.all # < return [MyApp::Gender::Male, MyApp::Gender::Female]
​
MyApp::Gender::Female.to_s # Return "female"
​
MyApp::Gender.from_string("male") # < return MyApp::Gender::Male
MyApp::Gender.from_string("unknown") # < throw Clear::IllegalEnumValueError
​
MyApp::Gender.valid?("female") #< Return true
MyApp::Gender.valid?("unknown") #< Return false
Migration
class MyMigration1
    include Clear::Migration
​
    def change(dir)
        create_enum("gender", %w(male female))
    end
end

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Last updated 3 years ago