BUGFIX: Fix splitting of keys in operation when handling deep object …

…structures #12

src/migrations/molecules/merge/index.js

@@ -9,7 +9,7 @@ const merge = (path, value, subject) => Object.keys(value).reduce(
             return merge([...path, key], value[key], subject);
         }
 
-        return $set([...resolveObjectPath(path), ...key], value[key], subject);
+        return $set([...resolveObjectPath(path), key], value[key], subject);
     },
     subject
 );

src/migrations/molecules/merge/index.spec.js

@@ -103,6 +103,36 @@ describe('Migrations > Atoms > $merge', () => {
             const subject = undefined;
             expect($merge('some.path', {some: 'value'}, subject)).to.be.an('undefined');
         });
+
+		it('should not split up keys in deep object structures (bugfix #12)', () => {
+			const subject = {
+				test: {
+					a: {
+						b: {
+							cdef: 'c'
+						}
+					}
+				}
+			};
+			const result = $merge('test', {
+				a: {
+					b: {
+						cdef: 'foo'
+					}
+				}
+			}, subject);
+
+			expect(result.test.a.b.c).to.be.an('undefined');
+			expect(result).to.deep.equal({
+				test: {
+					a: {
+						b: {
+							cdef: 'foo'
+						}
+					}
+				}
+			});
+		});
     });
 
     describe('Immutable', () => {