Document or add a push or put method

[maria-le]

Here is the Stack Overflow question. Please post an answer there.

Description

firebase-document save() method overwrites existing data at the node endpoint.

Expected outcome

Insert data at my target endpoint node. Retain existing data.

Actual outcome

Existing data is overwritten and deleted.

Live Demo

See Stack Overflow question.

Steps to reproduce

See Stack Overflow question.

Browsers Affected

• [x] Chrome
• [x] Firefox
• [x] Safari 9
• [x] Safari 8
• [x] Safari 7
• [x] Edge
• [x] IE 11
• [x] IE 10