Support uuid primary keys in build_stubbed

fixes #1498
closes #1514

Co-authored-by: Alexandre Ruban <alexandre@hey.com>

lib/factory_bot/strategy/stub.rb

@@ -47,13 +47,17 @@ def to_sym
 
       private
 
-      def next_id
-        @@next_id += 1
+      def next_id(result_instance)
+        if uuid_primary_key?(result_instance)
+          SecureRandom.uuid
+        else
+          @@next_id += 1
+        end
       end
 
       def stub_database_interaction_on_result(result_instance)
         if has_settable_id?(result_instance)
-          result_instance.id ||= next_id
+          result_instance.id ||= next_id(result_instance)
         end
 
         result_instance.instance_eval do
@@ -83,6 +87,13 @@ def has_settable_id?(result_instance)
           result_instance.class.primary_key
       end
 
+      def uuid_primary_key?(result_instance)
+        result_instance.respond_to?(:column_for_attribute) &&
+          (column = result_instance.column_for_attribute(result_instance.class.primary_key)) &&
+          column.respond_to?(:sql_type) &&
+          column.sql_type == "uuid"
+      end
+
       def clear_changes_information(result_instance)
         if result_instance.respond_to?(:clear_changes_information)
           result_instance.clear_changes_information

spec/acceptance/stub_spec.rb

@@ -59,43 +59,81 @@
   end
 end
 
-describe "a stubbed instance with no primary key" do
-  it "builds a stubbed instance" do
-    using_model_without_pk do
-      FactoryBot.define do
-        factory :model_without_pk
+describe "overridden primary keys conventions" do
+  describe "a stubbed instance with a uuid primary key" do
+    it "builds a stubbed instance" do
+      using_model("ModelWithUuid", primary_key: :uuid) do
+        FactoryBot.define do
+          factory :model_with_uuid
+        end
+
+        model = FactoryBot.build_stubbed(:model_with_uuid)
+        expect(model).to be_truthy
       end
+    end
+
+    it "behaves like a persisted record" do
+      using_model("ModelWithUuid", primary_key: :uuid) do
+        FactoryBot.define do
+          factory :model_with_uuid
+        end
 
-      model = FactoryBot.build_stubbed(:model_without_pk)
-      expect(model).to be_truthy
+        model = FactoryBot.build_stubbed(:model_with_uuid)
+        expect(model).to be_persisted
+        expect(model).not_to be_new_record
+      end
+    end
+
+    it "has a uuid primary key" do
+      using_model("ModelWithUuid", primary_key: :uuid) do
+        FactoryBot.define do
+          factory :model_with_uuid
+        end
+
+        model = FactoryBot.build_stubbed(:model_with_uuid)
+        expect(model.id).to be_a(String)
+      end
     end
   end
 
-  it "behaves like a persisted record" do
-    using_model_without_pk do
-      FactoryBot.define do
-        factory :model_without_pk
+  describe "a stubbed instance with no primary key" do
+    it "builds a stubbed instance" do
+      using_model("ModelWithoutPk", primary_key: false) do
+        FactoryBot.define do
+          factory :model_without_pk
+        end
+
+        model = FactoryBot.build_stubbed(:model_without_pk)
+        expect(model).to be_truthy
       end
+    end
 
-      model = FactoryBot.build_stubbed(:model_without_pk)
-      expect(model).to be_persisted
-      expect(model).not_to be_new_record
+    it "behaves like a persisted record" do
+      using_model("ModelWithoutPk", primary_key: false) do
+        FactoryBot.define do
+          factory :model_without_pk
+        end
+
+        model = FactoryBot.build_stubbed(:model_without_pk)
+        expect(model).to be_persisted
+        expect(model).not_to be_new_record
+      end
     end
   end
 
-  def using_model_without_pk
-    define_class("ModelWithoutPk", ActiveRecord::Base)
+  def using_model(name, primary_key:)
+    define_class(name, ActiveRecord::Base)
 
     connection = ActiveRecord::Base.connection
     begin
-      clear_generated_table("model_without_pks")
-      connection.create_table("model_without_pks", id: false) do |t|
+      clear_generated_table(name.tableize)
+      connection.create_table(name.tableize, id: primary_key) do |t|
         t.column :updated_at, :datetime
       end
 
       yield
     ensure
-      clear_generated_table("model_without_pks")
+      clear_generated_table(name.tableize)
     end
   end
 end