Check if a user already exists in a DB - sql

Question

How can I check if a user already exists in the database using gorm? I cannot seem to find a proper way to do so without an error logging to the console if no user was found.
This is my code so far
result := models.User{}
err := connection.DB.First(&result, "username = ?", user.Username).Error
if err == gorm.ErrRecordNotFound {
if err := connection.DB.Create(&user).Error; err != nil {
return c.Status(fiber.StatusInternalServerError).JSON(fiber.Map{
"error": "internal server error",
})
}
return c.Status(fiber.StatusCreated).JSON(fiber.Map{
"message": "user created",
})
}
if result.Username != "" {
return c.Status(fiber.StatusConflict).JSON(fiber.Map{
"error": "username already exists",
})
}
return c.Status(fiber.StatusBadRequest).JSON(fiber.Map{
"error": "internal server error",
})
but if a new user is created, an error is printed to the terminal saying the record was not found.

Answer 1

You can also use FirstOrCreate
From Doc:
Get first matched record or create a new one with given conditions (only works with struct, map conditions)
u := connection.DB.FirstOrCreate(user)
if u.Error != nil {
return c.Status(fiber.StatusInternalServerError).JSON(
fiber.Map{
"error": "Internal server error",
}
)
}
if u.RowsAffected == 1 {
return c.Status(fiber.StatusCreated).JSON(
fiber.Map{
"message": "User created successfully",
}
)
}
return c.Status(fiber.StatusBadRequest).JSON(
fiber.Map{
"error": "Username already exists",
}
)

Answer 2

Managed to find a way with raw MySQL.
var exists bool = false
if err := connection.DB.Raw(
"SELECT EXISTS(SELECT 1 FROM users WHERE username = ?)",
user.Username).
Scan(&exists).Error; err != nil {
return c.Status(fiber.StatusInternalServerError).JSON(fiber.Map{
"error": "internal server error",
})
}
if exists {
return c.Status(fiber.StatusBadRequest).JSON(fiber.Map{
"error": "Username already exists",
})
}
if err := connection.DB.Create(&user).Error; err != nil {
return c.Status(fiber.StatusInternalServerError).JSON(fiber.Map{
"error": "internal server error",
})
}
return c.Status(fiber.StatusCreated).JSON(fiber.Map{
"message": "User created successfully",
})