add user authentication

model/user.go

@@ -0,0 +1,50 @@
+package model
+
+import "github.com/jmoiron/sqlx"
+
+type User struct {
+	Model
+
+	Email    string `json:"email" db:"email"`
+	Password string `json:"-" db:"password"`
+}
+
+func (u *User) Create(db *sqlx.DB) error {
+	res, err := db.NamedExec("INSERT INTO users (email, password) VALUES (:email, :password)", map[string]any{
+		"email":    u.Email,
+		"password": u.Password,
+	})
+	if err != nil {
+		return err
+	}
+
+	u.ID, _ = res.LastInsertId()
+
+	return nil
+}
+
+func (u *User) FindByID(db *sqlx.DB) error {
+	row := db.QueryRowx("SELECT * FROM users WHERE id = ?", u.ID)
+	if row.Err() != nil {
+		return row.Err()
+	}
+
+	if err := row.StructScan(u); err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func (u *User) FindByEmail(db *sqlx.DB) error {
+	row := db.QueryRowx("SELECT * FROM users WHERE email = ?", u.Email)
+	if row.Err() != nil {
+		return row.Err()
+	}
+
+	if err := row.StructScan(u); err != nil {
+		return err
+	}
+
+	return nil
+}