onemanstartup/enums.md

## enums.md

      
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              enums.md
            
          
    Have a legacy database and need some enumerations in your models to match those stupid '4 rows/2 columns' tables with foreign keys and stop doing joins just to fetch a simple description? Or maybe use some integers instead of strings as the code for each value of your enumerations?
https://github.com/brainspec/enumerize

455/41/rails 4, activeadmin/2 days ago

I18n and ActiveRecord/Mongoid/MongoMapper
rspec, helpers, activeadmin

Default Value
Formtastic support
Select Form Helpers
l18n


https://github.com/beerlington/classy_enum

183/14/rails 4/17 days ago


Formtastic support
Generators
Modify member of enum
I18n
As a collection
Default Value
Back Reference to Owning Object
Validation
Select Form Helpers
Documented Easy Code

https://github.com/cassiomarques/enumerate_it

134/23/ / 6 days ago


Most important feature is support for string and integer values in db
I18n
Easy Code in 2 files mostly
Helpers


No Default values

class RelationshipStatus < EnumerateIt::Base
  associate_values(
    :single   => [1, 'Single'],
    :married  => [2, 'Married'],
    :widow    => [3, 'Widow'],
    :divorced => [4, 'Divorced']
  )
end


When calling methods like to_a and to_json, the returned values will be sorted using the translation for each one of the enumeration values. If you want to overwrite the default sort mode, you can use the sort_mode class method.

class RelationshipStatus < EnumerateIt::Base
  associate_values :married => 1, :single => 2

  sort_by :value
end


Not Only AR

class Person
  extend EnumerateIt
  attr_accessor :relationship_status

  has_enumeration_for :relationship_status, :with => RelationshipStatus
end


Have Generators

https://github.com/lwe/simple_enum

188/31/rails 3/3 month ago

meh,, not simple
for ActiveModel (including validations and i18n
helpers
Mongoid
https://github.com/jeffp/enumerated_attribute

200/45/rails 3/ year ago


ActiveRecord integration


ActionView form helpers


Custom labels


Formtastic


Scaffold generator integration


Definable enumeration labels


Enum helper methods


Dynamic predicate methods


Initialization


OLD State pattern support (enumerated_state) https://github.com/jeffp/enumerated_state


old


many files, many files for integration


no integration mongoid


No rails i18n


Too many issues


https://github.com/adzap/active_enum

62/23/rails 4/month ago


Form Helpers
Storage Backends + l18n
ordering
validations

https://github.com/cstrahan/rapi/blob/master/lib/rapi.rb#L496

http://gistflow.com/posts/682-ruby-enums-approaches

http://rails-bestpractices.com/posts/708-clever-enums-in-rails

http://stackoverflow.com/questions/75759/enums-in-ruby

Two ways. Symbols (:foo notation) or constants (FOO notation).
Symbols are appropriate when you want to enhance readability without littering code with literal strings.
postal_code[:minnesota] = "MN"
postal_code[:new_york] = "NY"

Constants are appropriate when you have an underlying value that is important. Just declare a module to hold your constants and then declare the constants within that.
module Foo
  BAR = 1
  BAZ = 2
  BIZ = 4
end

flags = Foo::BAR | Foo::BAZ # flags = 3

http://dev.mysql.com/doc/refman/5.0/en/enum.html

http://www.postgresql.org/docs/9.1/static/datatype-enum.html

http://jongyulin.com/2012/08/rails-digging-into-activerecord-and-postgresql-enums/

http://stackoverflow.com/questions/265725/what-is-the-best-way-to-handle-constants-in-ruby-when-using-rails

http://schneide.wordpress.com/2010/12/13/avoid-switch-use-enum/
http://programmers.stackexchange.com/questions/191063/should-classes-enums-and-other-entities-be-placed-in-separate-files
http://simpleprogrammer.com/2012/02/21/refactoring-switches-to-classes/