Provide a better error message on :required association

Fixes #18696.

1 files changed, 22 insertions, 2 deletions

diff --git a/activerecord/test/cases/associations/required_test.rb b/activerecord/test/cases/associations/required_test.rb
index a6123ac432..8b765a2e0c 100644
--- a/activerecord/test/cases/associations/required_test.rb
+++ b/activerecord/test/cases/associations/required_test.rb
@@ -40,7 +40,7 @@ class RequiredAssociationsTest < ActiveRecord::TestCase
 
     record = model.new
     assert_not record.save
-    assert_equal ["Parent can't be blank"], record.errors.full_messages
+    assert_equal ["Parent must exist"], record.errors.full_messages
 
     record.parent = Parent.new
     assert record.save
@@ -64,12 +64,32 @@ class RequiredAssociationsTest < ActiveRecord::TestCase
 
     record = model.new
     assert_not record.save
-    assert_equal ["Child can't be blank"], record.errors.full_messages
+    assert_equal ["Child must exist"], record.errors.full_messages
 
     record.child = Child.new
     assert record.save
   end
 
+  test "required has_one associations have a correct error message" do
+    model = subclass_of(Parent) do
+      has_one :child, required: true, inverse_of: false,
+      class_name: "RequiredAssociationsTest::Child"
+    end
+
+    record = model.create
+    assert_equal ["Child must exist"], record.errors.full_messages
+  end
+
+  test "required belongs_to associations have a correct error message" do
+    model = subclass_of(Child) do
+      belongs_to :parent, required: true, inverse_of: false,
+      class_name: "RequiredAssociationsTest::Parent"
+    end
+
+    record = model.create
+    assert_equal ["Parent must exist"], record.errors.full_messages
+  end
+
   private
 
   def subclass_of(klass, &block)