New API tested

storage/driver/boltdb.go

@@ -316,7 +316,29 @@ func applySet(doc, operator bson.M) (bson.M, error) {
 		if k == entity.Name {
 			return nil, errModifiedReserved
 		}
-		doc[k] = v
+		nesting := strings.Split(k, ".")
+		if len(nesting) > 1 {
+			mInterface, ok := doc[nesting[0]]
+			if !ok {
+				return nil, fmt.Errorf("path does not exist: %s (%s): %+v", k, nesting[0], doc)
+			}
+			m, ok := mInterface.(map[string]interface{})
+			if !ok {
+				pm, pmok := mInterface.(primitive.M)
+				m = map[string]interface{}(pm)
+				ok = pmok
+			}
+			if !ok {
+				return nil, fmt.Errorf("subpath cannot be followed for non object: %s (%s): %+v (%T)", k, nesting[0], mInterface, mInterface)
+			}
+			subdoc, err := applySet(bson.M(m), bson.M{strings.Join(nesting[1:], "."): v})
+			if err != nil {
+				return nil, err
+			}
+			doc[nesting[0]] = subdoc
+		} else {
+			doc[k] = v
+		}
 	}
 	return doc, nil
 }

storage/driver/boltdb_test.go

@@ -396,3 +396,50 @@ func fillBoltDB(t *testing.T, bdb *BoltDB) {
 		t.Fatal(err)
 	}
 }
+
+func TestApplySet(t *testing.T) {
+	cases := map[string]struct {
+		doc      bson.M
+		operator bson.M
+		want     bson.M
+	}{
+		"noop on empty": {},
+		"noop on full": {
+			doc:  bson.M{"hello": "world"},
+			want: bson.M{"hello": "world"},
+		},
+		"add new field on full": {
+			operator: bson.M{"hi": "mom"},
+			doc:      bson.M{"hello": "world"},
+			want:     bson.M{"hello": "world", "hi": "mom"},
+		},
+		"change only field on full": {
+			operator: bson.M{"hello": "lol jk not world"},
+			doc:      bson.M{"hello": "world"},
+			want:     bson.M{"hello": "lol jk not world"},
+		},
+		"set existing, nested field": {
+			operator: bson.M{"hello.world": "hi"},
+			doc:      bson.M{"hello": bson.M{"world": "not hi"}},
+			want:     bson.M{"hello": bson.M{"world": "hi"}},
+		},
+		"add to existing, nested field": {
+			operator: bson.M{"hello.notworld": "hi"},
+			doc:      bson.M{"hello": bson.M{"world": "not hi"}},
+			want:     bson.M{"hello": bson.M{"world": "not hi", "notworld": "hi"}},
+		},
+	}
+
+	for name, d := range cases {
+		c := d
+		t.Run(name, func(t *testing.T) {
+			out, err := applySet(c.doc, c.operator)
+			if err != nil {
+				t.Fatal(err)
+			}
+			if fmt.Sprint(out) != fmt.Sprint(c.want) {
+				t.Fatalf("(%+v, %+v) => want \n%+v\n, got \n%+v", c.doc, c.operator, c.want, out)
+			}
+		})
+	}
+}