3 files changed, 42 insertions, 0 deletions
diff --git a/activerecord/CHANGELOG.md b/activerecord/CHANGELOG.md
index 58f680a03f..2845e945db 100644
--- a/activerecord/CHANGELOG.md
+++ b/activerecord/CHANGELOG.md
@@ -1,3 +1,11 @@
+*   Fixed error with validation with enum fields for records where the
+    value for any enum attribute is always evaluated as 0 during
+    uniqueness validation.
+
+    Fixes #14172
+
+    *Vilius Luneckas* *Ahmed AbouElhamayed*
+
 * `before_add` callbacks are fired before the record is saved on
   `has_and_belongs_to_many` assocations *and* on `has_many :through`
   associations.  Before this change, `before_add` callbacks would be fired
diff --git a/activerecord/lib/active_record/validations/uniqueness.rb b/activerecord/lib/active_record/validations/uniqueness.rb
index 7ebe9dfec0..49b0f73219 100644
--- a/activerecord/lib/active_record/validations/uniqueness.rb
+++ b/activerecord/lib/active_record/validations/uniqueness.rb
@@ -13,6 +13,7 @@ module ActiveRecord
       def validate_each(record, attribute, value)
         finder_class = find_finder_class_for(record)
         table = finder_class.arel_table
+        value = map_enum_attribute(finder_class,attribute,value)
         value = deserialize_attribute(record, attribute, value)
 
         relation = build_relation(finder_class, table, attribute, value)
@@ -91,6 +92,12 @@ module ActiveRecord
         value = coder.dump value if value && coder
         value
       end
+
+      def map_enum_attribute(klass,attribute,value)
+        mapping = klass.enum_mapping_for(attribute.to_s)
+        value = mapping[value] if value && mapping
+        value
+      end
     end
 
     module ClassMethods
diff --git a/activerecord/test/cases/enum_test.rb b/activerecord/test/cases/enum_test.rb
index 1b95708cb3..f8ebd7caee 100644
--- a/activerecord/test/cases/enum_test.rb
+++ b/activerecord/test/cases/enum_test.rb
@@ -222,4 +222,31 @@ class EnumTest < ActiveRecord::TestCase
       end
     end
   end
+
+  test "validate uniqueness" do
+    klass = Class.new(ActiveRecord::Base) do
+      def self.name; 'Book'; end
+      enum status: [:proposed, :written]
+      validates_uniqueness_of :status
+    end
+    klass.delete_all
+    klass.create!(status: "proposed")
+    book = klass.new(status: "written")
+    assert book.valid?
+    book.status = "proposed"
+    assert_not book.valid?
+  end
+
+  test "validate inclusion of value in array" do
+    klass = Class.new(ActiveRecord::Base) do
+      def self.name; 'Book'; end
+      enum status: [:proposed, :written]
+      validates_inclusion_of :status, in: ["written"]
+    end
+    klass.delete_all
+    invalid_book = klass.new(status: "proposed")
+    assert_not invalid_book.valid?
+    valid_book = klass.new(status: "written")
+    assert valid_book.valid?
+  end
 end