God Class (ARCH5189)

Key go.quality.god-struct · Severity warning · Category quality

Structs carrying many fields and methods take on multiple responsibilities, lower cohesion, and become hard to change. Split them by responsibility.

Incorrect

type App struct {
    db, cache, mailer, logger, auth, billing, search, queue any
}

func (a *App) CreateUser()    {}
func (a *App) SendEmail()     {}
func (a *App) Charge()        {}
func (a *App) Index()         {}
// ... dozens of unrelated methods

Correct

type UserService struct{ db, cache any }
func (s *UserService) Create() {}

type BillingService struct{ db any }
func (s *BillingService) Charge() {}

Fix

Split the struct into focused, smaller types following the single-responsibility principle.