option to disable scopes that ActiveRecord.enum generates by default

Author: alfie-max

activerecord/CHANGELOG.md

@@ -1,3 +1,7 @@
+*   Allow disabling scopes generated by `ActiveRecord.enum`.
+
+    *Alfred Dominic*
+
 *   Ensure that `delete_all` on collection proxy returns affected count.
 
     *Ryuta Kamizono*

activerecord/lib/active_record/enum.rb

@@ -149,6 +149,7 @@ def enum(definitions)
       klass = self
       enum_prefix = definitions.delete(:_prefix)
       enum_suffix = definitions.delete(:_suffix)
+      enum_scopes = definitions.delete(:_scopes)
       definitions.each do |name, values|
         assert_valid_enum_definition_values(values)
         # statuses = { }
@@ -195,8 +196,10 @@ def enum(definitions)
             define_method("#{value_method_name}!") { update!(attr => value) }
 
             # scope :active, -> { where(status: 0) }
-            klass.send(:detect_enum_conflict!, name, value_method_name, true)
-            klass.scope value_method_name, -> { where(attr => value) }
+            if enum_scopes != false
+              klass.send(:detect_enum_conflict!, name, value_method_name, true)
+              klass.scope value_method_name, -> { where(attr => value) }
+            end
           end
         end
         enum_values.freeze

activerecord/test/cases/enum_test.rb

@@ -551,4 +551,13 @@ def self.name; "Book"; end
   test "data type of Enum type" do
     assert_equal :integer, Book.type_for_attribute("status").type
   end
+
+  test "scopes can be disabled" do
+    klass = Class.new(ActiveRecord::Base) do
+      self.table_name = "books"
+      enum status: [:proposed, :written], _scopes: false
+    end
+
+    assert_raises(NoMethodError) { klass.proposed }
+  end
 end