impl entities and test

storage/driver/boltdb.go

@@ -310,6 +310,14 @@ func applySet(doc, operator bson.M) (bson.M, error) {
 		if k == entity.ID {
 			continue
 		}
+		if k == "." {
+			m, ok := v.(bson.M)
+			if !ok {
+				return nil, errors.New("cannot assign non-map to doc")
+			}
+			doc = m
+			return doc, nil
+		}
 		nesting := strings.Split(k, ".")
 		if len(nesting) > 1 {
 			mInterface, ok := doc[nesting[0]]

storage/graph.go

@@ -74,10 +74,8 @@ func (g Graph) Insert(ctx context.Context, namespace string, one entity.One) err
 	if one.ID == "" {
 		return errors.New("cannot create document without id")
 	}
-	if ones, err := g.ListCaseInsensitive(ctx, namespace, one.ID); err != nil {
-		return err
-	} else if len(ones) > 0 {
-		return fmt.Errorf("collision on primary key when case insensitive: cannot create %q because %+v exists", one.ID, ones)
+	if one, err := g.Get(ctx, namespace, one.ID); err == nil {
+		return fmt.Errorf("collision on primary key when case insensitive: cannot create %q because %+v exists", one.ID, one)
 	}
 	return g.driver.Insert(ctx, namespace, one)
 }