option to disable all methods that ActiveRecord.enum generates

Author: alfie-max

activerecord/CHANGELOG.md

@@ -1,3 +1,7 @@
+*   Allow disabling methods generated by `ActiveRecord.enum`.
+
+    *Alfred Dominic*
+
 *   Avoid validating `belongs_to` association if it has not changed.
 
     Previously, when updating a record, Active Record will perform an extra query to check for the presence of

activerecord/lib/active_record/enum.rb

@@ -179,14 +179,14 @@ def enum(name = nil, values = nil, **options)
         return _enum(name, values, **options)
       end
 
-      definitions = options.slice!(:_prefix, :_suffix, :_scopes, :_default)
+      definitions = options.slice!(:_prefix, :_suffix, :_scopes, :_default, :_instance_methods)
       options.transform_keys! { |key| :"#{key[1..-1]}" }
 
       definitions.each { |name, values| _enum(name, values, **options) }
     end
 
     private
-      def _enum(name, values, prefix: nil, suffix: nil, scopes: true, **options)
+      def _enum(name, values, prefix: nil, suffix: nil, scopes: true, instance_methods: true, **options)
         assert_valid_enum_definition_values(values)
         # statuses = { }
         enum_values = ActiveSupport::HashWithIndifferentAccess.new
@@ -222,14 +222,14 @@ def _enum(name, values, prefix: nil, suffix: nil, scopes: true, **options)
 
             value_method_name = "#{prefix}#{label}#{suffix}"
             value_method_names << value_method_name
-            define_enum_methods(name, value_method_name, value, scopes)
+            define_enum_methods(name, value_method_name, value, scopes, instance_methods)
 
             method_friendly_label = label.gsub(/[\W&&[:ascii:]]+/, "_")
             value_method_alias = "#{prefix}#{method_friendly_label}#{suffix}"
 
             if value_method_alias != value_method_name && !value_method_names.include?(value_method_alias)
               value_method_names << value_method_alias
-              define_enum_methods(name, value_method_alias, value, scopes)
+              define_enum_methods(name, value_method_alias, value, scopes, instance_methods)
             end
           end
         end
@@ -245,14 +245,16 @@ def initialize(klass)
         private
           attr_reader :klass
 
-          def define_enum_methods(name, value_method_name, value, scopes)
-            # def active?() status_for_database == 0 end
-            klass.send(:detect_enum_conflict!, name, "#{value_method_name}?")
-            define_method("#{value_method_name}?") { public_send(:"#{name}_for_database") == value }
+          def define_enum_methods(name, value_method_name, value, scopes, instance_methods)
+            if instance_methods
+              # def active?() status_for_database == 0 end
+              klass.send(:detect_enum_conflict!, name, "#{value_method_name}?")
+              define_method("#{value_method_name}?") { public_send(:"#{name}_for_database") == value }
 
-            # def active!() update!(status: 0) end
-            klass.send(:detect_enum_conflict!, name, "#{value_method_name}!")
-            define_method("#{value_method_name}!") { update!(name => value) }
+              # def active!() update!(status: 0) end
+              klass.send(:detect_enum_conflict!, name, "#{value_method_name}!")
+              define_method("#{value_method_name}!") { update!(name => value) }
+            end
 
             # scope :active, -> { where(status: 0) }
             # scope :not_active, -> { where.not(status: 0) }

activerecord/test/cases/enum_test.rb

@@ -1020,4 +1020,15 @@ def self.name
     end
     assert_equal "Unknown enum attribute 'columnless_genre' for Book", error.message
   end
+
+  test "default methods can be disabled by :_instance_methods" do
+    klass = Class.new(ActiveRecord::Base) do
+      self.table_name = "books"
+      enum status: [:proposed, :written], _instance_methods: false
+    end
+
+    instance = klass.new
+    assert_raises(NoMethodError) { instance.proposed? }
+    assert_raises(NoMethodError) { instance.proposed! }
+  end
 end