/
service_postgres.go
138 lines (128 loc) · 2.69 KB
/
service_postgres.go
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package unitsvc
import (
"context"
"database/sql"
"github.com/google/uuid"
"github.com/studiously/classsvc/classsvc"
"github.com/studiously/introspector"
"github.com/studiously/unitsvc/models"
)
func New(db *sql.DB, cs classsvc.Service) Service {
return &postgresService{
db,
cs,
}
}
type postgresService struct {
*sql.DB
cs classsvc.Service
}
func (s *postgresService) ListUnits(ctx context.Context, classID uuid.UUID) ([]uuid.UUID, error) {
classes, err := s.cs.ListClasses(ctx)
if err != nil {
return nil, err
}
for _, class := range classes {
if class == classID {
units, err := models.UnitsByClassID(s, classID)
if err != nil {
return nil, err
}
results := make([]uuid.UUID, len(units))
for _, u := range units {
results = append(results, u.ID)
}
return results, nil
}
}
return nil, ErrNotFound
}
func (s *postgresService) CreateUnit(ctx context.Context, classID uuid.UUID, title string) error {
classes, err := s.cs.ListClasses(ctx)
if err != nil {
switch err {
case sql.ErrNoRows:
return ErrNotFound
default:
return err
}
}
for _, class := range classes {
if class == classID {
unit := &models.Unit{
ID: uuid.New(),
ClassID: classID,
Title: title,
}
return unit.Save(s)
}
}
return ErrNotFound
}
func (s *postgresService) RenameUnit(ctx context.Context, unitID uuid.UUID, title string) error {
unit, err := models.UnitByID(s, unitID)
if err != nil {
switch err {
case sql.ErrNoRows:
return ErrNotFound
default:
return err
}
}
classes, err := s.cs.ListClasses(ctx)
if err != nil {
return err
}
for _, class := range classes {
if class == unit.ClassID {
unit.Title = title
return unit.Save(s)
}
}
return ErrNotFound
}
func (s *postgresService) DeleteUnit(ctx context.Context, unitID uuid.UUID) error {
unit, err := models.UnitByID(s, unitID)
if err != nil {
switch err {
case sql.ErrNoRows:
return ErrNotFound
default:
return err
}
}
classes, err := s.cs.ListClasses(ctx)
if err != nil {
return err
}
for _, class := range classes {
if class == unit.ClassID {
return unit.Delete(s)
}
}
return ErrNotFound
}
func (s *postgresService) GetUnit(ctx context.Context, unitID uuid.UUID) (*models.Unit, error) {
unit, err := models.UnitByID(s, unitID)
if err != nil {
switch err {
case sql.ErrNoRows:
return nil, ErrNotFound
default:
return nil, err
}
}
classes, err := s.cs.ListClasses(ctx)
if err != nil {
return nil, err
}
for _, class := range classes {
if class == unit.ClassID {
return unit, nil
}
}
return nil, ErrNotFound
}
func subj(ctx context.Context) uuid.UUID {
return ctx.Value(introspector.SubjectContextKey).(uuid.UUID)
}