A chat room in letschat was archived. To revive it we can alter the document in the MongoDB instance.

Login into the MongoDB instance with the CLI or Web console.

> show dbs
admin     0.000GB
letschat  0.001GB
local     0.000GB

Switch

> use letschat
switched to db letschat

Check information types

> show collections
files
messages
migrootions
rooms
sessions
usermessages
users

Print all documents from a collection

> db.rooms.find().pretty()

Find document by attribute

> db.rooms.find({slug:"elk"}).pretty()
{
        "_id" : ObjectId("59a666cfa9886c002c30b404"),
        "owner" : ObjectId("59a547c2aed276003facf84f"),
        "name" : "Elasticsearch, Logstash and Kibana",
        "slug" : "elk",
        "description" : "Everything about the Elasticsearch Universe, including Logstash, Beats",
        "private" : false,
        "lastActive" : ISODate("2017-08-31T08:46:33.690Z"),
        "created" : ISODate("2017-08-30T07:18:39.885Z"),
        "messages" : [ ],
        "participants" : [ ],
        "archived" : true,
        "__v" : 0
}

Update document

> db.rooms.update(
...    { slug: "elk" },
...    {
...       $set: { archived: false }
...    }
... );
WriteResult({ "nMatched" : 1, "nUpserted" : 0, "nModified" : 1 })