add tutorial 5

Makefile

@@ -8,4 +8,7 @@ tutorial_3:
 	go run -tags=tutorial_3 .
 
 tutorial_4:
-	go run -tags=tutorial_4 .
+	go run -tags=tutorial_4 .
+
+tutorial_5:
+	go run -tags=tutorial_5 .

tutorial_5.go

@@ -0,0 +1,43 @@
+//go:build tutorial_5
+// +build tutorial_5
+
+package main
+
+import (
+	"fmt"
+	"log"
+
+	"github.com/ditrit/badaas-orm-tutorial/conditions"
+	"github.com/ditrit/badaas-orm-tutorial/models"
+	"github.com/ditrit/badaas/orm"
+	"go.uber.org/fx"
+	"gorm.io/gorm"
+)
+
+// Target: get all cities whose name is 'Paris' and that are the capital of their country
+func tutorial(db *gorm.DB, shutdowner fx.Shutdowner) {
+	cities, err := orm.NewQuery[models.City](
+		db,
+		conditions.City.NameIs().Eq("Paris"),
+		conditions.City.Country(
+			conditions.Country.CapitalIdIs().Dynamic().Eq(conditions.City.ID),
+		),
+	).Find()
+
+	// SQL executed:
+	// SELECT cities.* FROM cities
+	// INNER JOIN countries Country ON
+	//    Country.id = cities.country_id AND Country.capital_id = cities.id AND Country.deleted_at IS NULL
+	// WHERE cities.name = "Paris" AND cities.deleted_at IS NULL
+
+	if err != nil {
+		log.Panicln(err)
+	}
+
+	log.Println("Cities named 'Paris' that are the capital of their country are:")
+	for i, city := range cities {
+		fmt.Printf("\t%v: %+v\n", i+1, city)
+	}
+
+	shutdowner.Shutdown()
+}