pet := pet
		if pet.ID == 0 {
			t.Fatalf("Pet's ID should be created")
		}

		user.Pets = append(user.Pets, &pet)
	}

	CheckUser(t, user2, user)

	AssertAssociationCount(t, user, "Pets", 5, "AfterAppendSlice")

	// Replace
	pet2 := Pet{Name: "pet-has-many-replace"}

	if err := DB.Model(&user2).Association("Pets").Replace(&pet2); err != nil {
		t.Fatalf("Error happened when append pet, got %v", err)
	}

		t.Fatalf("Error happened when append language, got %v", err)
	}

	user.Languages = append(user.Languages, languages...)

	CheckUser(t, user2, user)

	AssertAssociationCount(t, user, "Languages", 5, "AfterAppendSlice")

	// Replace
	language2 := Language{Code: "language-many2many-replace", Name: "language-many2many-replace"}
	DB.Create(&language2)