package models import ( "time" "go.mongodb.org/mongo-driver/bson/primitive" ) type Course struct { ID primitive.ObjectID `bson:"_id"` Name string `json:"name" validate:"required"` Description string `json:"description"` Grade_level int `json:"grade_level" validate:"required"` Credits int `json:"credits" validate:"required"` Created_at time.Time `json:"created_at"` Updated_at time.Time `json:"updated_at"` }