enum_from_hash¶ ↑

A Rails plugin to use a hash of symbol keys to integers to make an integer db column behave like a enum in ActiveRecord. Given the hash it adds:

- a constant for the hash
- contants for each member of the hash
- an instance setter for the field that accepts either an integer or one
  of the symbol keys from the hash
- a _name method that returns the string name
- a instance predicate for each symbol in the hash
- validation that the value of the column one of the hashes values

For example ¶ ↑

If the foo table has an integer column bar:

class Foo < ActiveRecord::Base
  ...
  enum_from_hash :bar, {:argle => 1, :bargle => 2}
  ...
end

The following would work:

>> Foo::BAR
=> {:argle => 1, :bargle => 2}
>> Foo::ARGLE
=> 1
>> f = Foo.new
>> f.bar = :argle
>> f.bar
>= 1
>> f.argle?
>= true
>> f.bargle?
>= false
>> f.bar_name
>= 'argle'

It also works if the column in the db ends in _id, adding getter with the name w/o _id.