Basic stuff, loadOne

mongox/common/loadone.go

@@ -0,0 +1,35 @@
+package common
+
+import (
+	"github.com/mainnika/mongox-go-driver/mongox"
+	"github.com/mainnika/mongox-go-driver/mongox/errors"
+	"github.com/mainnika/mongox-go-driver/mongox/query"
+	"github.com/mongodb/mongo-go-driver/mongo"
+	"github.com/mongodb/mongo-go-driver/mongo/options"
+)
+
+// LoadOne function loads a first single target document by a query
+func LoadOne(db *mongox.Database, target interface{}, composed *query.Query) error {
+
+	collection := db.GetCollectionOf(target)
+	opts := &options.FindOneOptions{}
+
+	if composed.Sorter() != nil {
+		opts.Sort = composed.Sorter().Sort()
+	}
+
+	result := collection.FindOne(db.Context(), composed.M(), opts)
+	if result.Err() != nil {
+		return errors.InternalErrorf("can't create find one result: %s", result.Err())
+	}
+
+	err := result.Decode(target)
+	if err == mongo.ErrNoDocuments {
+		return errors.NotFoundErrorf("%s", err)
+	}
+	if err != nil {
+		return errors.InternalErrorf("can't decode desult: %s", err)
+	}
+
+	return nil
+}