No more GORM.

Too much magic. I'll just write a JOIN and create small, composable data
types to represent my domain objects.

grug brain smile, complexity demon no visit today

main.go

@@ -8,42 +8,27 @@ import (
 )
 
 func main() {
-	// log.Println("entering main")
 	var (
 		mapDB string
 	)
 
 	flag.StringVar(&mapDB, "map", "Aardwolf.db", "name of aardwolf map file")
 
-	// log.Println("parsing flags?")
 	flag.Parse()
-	// log.Println("flags parsed")
 
 	am, err := NewMapper(mapDB)
 	if err != nil {
 		log.Fatalf("error creating AardMapper: %s\n", err)
 	}
-	log.Printf("databse opened: %#+v\n", am)
+	// log.Printf("databse opened: %#+v\n", am)
 
-	areas, err := am.Areas()
+	exits, err := am.Exits()
-	if err != nil {
-		log.Fatalf("error fetching Areas: %s\n", err)
-	}
-	log.Printf("found %d areas\n", len(areas))
-	for k, v := range areas {
-		log.Printf("found Area: %s\n", k)
-		log.Printf("%#+v\n", v)
-		break
-	}
-
-	rooms, err := am.Rooms()
 	if err != nil {
 		log.Fatalf("error fetching Rooms: %s\n", err)
 	}
-	log.Printf("found %d rooms\n", len(rooms))
+	for _, v := range exits {
-	for k, v := range rooms {
+		// log.Printf("Area: %#+v\n", v)
-		log.Printf("found Room: (%s,%s)[%s]\n", v.Name, v.Area, k)
+		log.Printf("RoomExit found: %s\n", v)
-		log.Printf("%#+v\n", v)
 		break
 	}
 

mapper.go

@@ -1,19 +1,17 @@
 package main
 
 import (
+	"database/sql"
 	"fmt"
+	// "log"
 
-	"gorm.io/driver/sqlite"
+	_ "github.com/mattn/go-sqlite3"
-	"gorm.io/gorm"
 )
 
 func NewMapper(fn string) (AardMapper, error) {
 	var am AardMapper
 
-	db, err := gorm.Open(sqlite.Open(fn), &gorm.Config{})
+	db, err := sql.Open("sqlite3", fn)
-	db.AutoMigrate(&Area{})
-	db.AutoMigrate(&Room{})
-	db.AutoMigrate(&Exit{})
 	if err != nil {
 
 		return am, fmt.Errorf("error opening mapper sqlite3 database: %s\n", err)
@@ -23,33 +21,47 @@ func NewMapper(fn string) (AardMapper, error) {
 }
 
 type AardMapper struct {
-	DB *gorm.DB
+	DB *sql.DB
 }
 
 func (am AardMapper) Areas() (map[string]Area, error) {
 	areas := make(map[string]Area)
-	x := make([]Area, 0)
+	rows, err := am.DB.Query("select uid, name, texture, color, flags from areas;")
-	tx := am.DB.Find(&x)
+	defer rows.Close()
 
-	if tx.Error != nil {
+	if err != nil {
-		return nil, fmt.Errorf("error fetching areas: %w", tx.Error)
+		return nil, fmt.Errorf("error selecting areas: %w", err)
 	}
-	for _, a := range x {
+	for rows.Next() {
-		areas[a.Uid] = a
+		a := Area{}
+		err := rows.Scan(&a.Uid, &a.Name, &a.Texture, &a.Color, &a.Flags)
+		if err != nil {
+			return nil, fmt.Errorf("error scanning Areas: %d", err)
+		}
+
+		areas[a.Uid.String] = a
 	}
 	return areas, nil
 }
 
-func (am AardMapper) Rooms() (map[string]Room, error) {
+func (am AardMapper) Exits() ([]RoomExit, error) {
-	rooms := make(map[string]Room)
+	exits := make([]RoomExit, 0)
-	x := make([]Room, 0)
+	rows, err := am.DB.Query("select r.uid,r.name,r.building,r.info,r.notes,r.flags,r.area, r.norecall,r.noportal,e.dir,e.fromuid,e.touid,e.level from rooms r INNER JOIN exits e ON r.uid = e.fromuid;")
-	tx := am.DB.Find(&x)
+	// rows, err := am.DB.Query("select e.dir,e.fromuid,e.touid,e.level from rooms r INNER JOIN exits e ON r.uid = e.fromuid;")
+	defer rows.Close()
 
-	if tx.Error != nil {
+	if err != nil {
-		return nil, fmt.Errorf("error fetching areas: %w", tx.Error)
+		return nil, fmt.Errorf("error selecting areas: %w", err)
 	}
-	for _, a := range x {
+	for rows.Next() {
-		rooms[a.Uid] = a
+		e := RoomExit{}
+		// err := rows.Scan(&e.Dir, &e.Fromuid, &e.Touid, &e.Level)
+		err := rows.Scan(&e.Uid, &e.Name, &e.Building, &e.Info, &e.Notes, &e.Flags, &e.AreaName, &e.Norecall, &e.Noportal, &e.Dir, &e.Fromuid, &e.Touid, &e.Level)
+		if err != nil {
+			return nil, fmt.Errorf("error scanning Areas: %d", err)
+		}
+
+		exits = append(exits, e)
 	}
-	return rooms, nil
+	return exits, nil
 }

models.go

@@ -1,27 +1,34 @@
 package main
 
 import (
-	"gorm.io/gorm"
+	"database/sql"
+	"fmt"
 )
 
 type Area struct {
-	gorm.Model
+	Uid, Name, Flags, Color, Texture sql.NullString
-	Uid         string
-	Name, Flags string
 }
 
 type Room struct {
-	gorm.Model
+	Uid, Name, Building, Info, Notes, Flags sql.NullString
-	Uid                string
+	Area                                    Area
-	Name, Area         string
+	AreaName                                sql.NullString
-	Building           string
+	Norecall, Noportal                      sql.NullInt64
-	Info, Notes, Flags string
+	Exits                                   []Exit
-	X, Y, Z            int
-	Norecall, Noportal int
-	Exits              []Exit `gorm:"foreignKey:Fromuid"`
 }
 
 type Exit struct {
-	gorm.Model
+	Dir            sql.NullString
-	Dir, Fromuid, Touid, Level string
+	Fromuid, Touid sql.NullString
+	Level          int
+}
+
+type RoomExit struct {
+	Room
+	Exit
+}
+
+func (re RoomExit) String() string {
+
+	return fmt.Sprintf("[%s(%s) |%s> %s]", re.Name.String, re.Uid.String, re.Dir.String, re.Touid.String)
 }

walk.go

@@ -6,7 +6,7 @@ import (
 )
 
 func walk(r Room, parent *cgraph.Node, g *cgraph.Graph) error {
-	_, err := g.CreateNode(r.Uid)
+	_, err := g.CreateNode(r.Uid.String)
 	if err != nil {
 		return err
 	}