externalize more panic/error strings

errors.go

@@ -10,6 +10,7 @@ var (
 	ErrOutOfBounds             = errors.New("Index(es) out of bounds!")
 	ErrAppendMultipleDocuments = errors.New("Cannot append to multiple documents!")
 	ErrNotSliceOrStruct        = errors.New("Current object or field is not a slice nor a struct!")
+	ErrUnsupportedID           = errors.New("Unknown or unsupported id type provided")
 )
 
 const (

idcounter.go

@@ -17,7 +17,7 @@ type Counter struct {
 }
 
 func getLastInColl(cname string, id interface{}) interface{} {
-	var opts *options.FindOneOptions = options.FindOne()
+	var opts = options.FindOne()
 
 	switch id.(type) {
 	case int, int64, int32, uint, uint32, uint64, primitive.ObjectID:
@@ -25,7 +25,7 @@ func getLastInColl(cname string, id interface{}) interface{} {
 	case string:
 		opts.SetSort(bson.M{"createdAt": -1})
 	default:
-		panic("unsupported id type provided")
+		panic(ErrUnsupportedID)
 	}
 
 	var cnt Counter

model.go

@@ -59,7 +59,7 @@ func (m *Model) setTypeName(str string) {
 func (m *Model) getColl() *mongo.Collection {
 	_, ri, ok := ModelRegistry.HasByName(m.typeName)
 	if !ok {
-		panic(fmt.Sprintf("the model '%s' has not been registered", m.typeName))
+		panic(fmt.Sprintf(errFmtModelNotRegistered, m.typeName))
 	}
 	return DB.Collection(ri.Collection)
 }
@@ -80,7 +80,7 @@ func (m *Model) getIdxs() []*mongo.IndexModel {
 func (m *Model) getParsedIdxs() map[string][]InternalIndex {
 	_, ri, ok := ModelRegistry.HasByName(m.typeName)
 	if !ok {
-		panic(fmt.Sprintf("model '%s' not registered", m.typeName))
+		panic(fmt.Sprintf(errFmtModelNotRegistered, m.typeName))
 	}
 	return ri.Indexes
 }
@@ -154,7 +154,9 @@ func (m *Model) FindOne(query interface{}, options ...*options.FindOneOptions) (
 	rip := coll.FindOne(context.TODO(), query, options...)
 	raw := bson.M{}
 	err := rip.Decode(&raw)
-	panik(err)
+	if err != nil {
+		return nil, err
+	}
 	qqn := ModelRegistry.new_(m.typeName)
 	idoc, ok := qqn.(IDocument)
 	if ok {

registry.go

@@ -305,7 +305,7 @@ func (r TModelRegistry) Model(mdl ...any) {
 		}
 		inds, refs, gfs, coll := parseTags(t, v)
 		if coll == "" {
-			panic(fmt.Sprintf("a model needs to be given a collection name! (passed type: %s)", n))
+			panic(fmt.Sprintf("a Document needs to be given a collection name! (passed type: %s)", n))
 		}
 		ModelRegistry[n] = &Model{
 			Idx:              idx,

util.go

@@ -135,7 +135,7 @@ func incrementInterface(t interface{}) interface{} {
 	case primitive.ObjectID:
 		t = primitive.NewObjectID()
 	default:
-		panic("unknown or unsupported id type")
+		panic(ErrUnsupportedID)
 	}
 	return t
 }