Merge pull request #6 from grauwoelfchen/uniqueness-validation

Add uniqueness validation support.

lib/enum_accessor.rb

@@ -16,14 +16,18 @@ def enum_accessor(column, keys, options={})
       else
         raise ArgumentError.new('enum_accessor takes Array or Hash as the second argument')
       end
+      freezed_dict = dict.with_indifferent_access.freeze
 
       # Define class attributes
       definition = options[:class_attribute] || column.to_s.pluralize.to_sym
       class_attribute definition
       class_attribute "_human_#{definition}"
-      send "#{definition}=", dict.with_indifferent_access.freeze
+      send "#{definition}=", freezed_dict
       send "_human_#{definition}=", {}
 
+      # Define as enums
+      defined_enums[column.to_s] = freezed_dict
+
       # Getter
       define_method(column) do
         send(definition).key(read_attribute(column))

spec/enum_accessor_spec.rb

@@ -107,6 +107,22 @@ class UserValidateAllowNil < ActiveRecord::Base
     expect(user.valid?).to be_truthy
   end
 
+  it 'supports uniqueness validation' do
+    class UserValidateWithUniqueness < ActiveRecord::Base
+      self.table_name = :users
+      enum_accessor :gender, [:female, :male]
+
+      validates :gender, uniqueness: true
+    end
+
+    UserValidateWithUniqueness.create!(gender: :male)
+
+    user = UserValidateWithUniqueness.new
+    user.gender = 'male'
+    expect(user.valid?).to be_falsey
+    expect(user.errors[:gender]).to eq(['has already been taken'])
+  end
+
   it 'supports find_or_create_by' do
     # `find_or_create_by` uses where-based raw value for find,
     # then passes the raw value to the setter method for create.