Temporary Ids

As mentioned in the previous lesson, a tempid can simply be the collection name, i.e. _user.

However, if you would like to reference that tempid somewhere else in your transaction, it is necessary to create a unique tempid. To make a unique tempid, just append the collection with any non-valid collection character (anything other than a-z, A-Z, 0-9, _) followed by anything else. For example, _user$jdoe or _user#1.

In the below example, we are creating both a person and a chat message. We are using the person's tempid as a reference in chat/person.

[
  {
    "_id": "person$joy",
    "handle": "jTan",
    "fullName": "Joy Tan"
  },
  {
    "_id": "chat",
    "message": "This is a message from Joy!",
    "instant": "#(now)",
    "person": "person$joy"
  }
]

Add a Person and a Chat

Write a transaction!

Using the above transaction example, create your own person and chat, and reference that person as `chat/person`.