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1.3 KiB
1.3 KiB
Tracking last modified Date of a Firebase Database
This template shows how to keep track of the date at which the Firebase Database or a subset of a firebase Database was last modified.
Functions Code
See file functions/index.js for the code.
This is done by simply updating a lastmodified
attribute on the parent of the node which is tracked (for instance at the root of the Database).
The dependencies are listed in functions/package.json.
Sample Database Structure
As an example we'll be using a simple chat database structure:
/functions-project-12345
/chat
/key-123456
username: "Mat"
text: "Hey Bob!"
/key-123457
username: "Bob"
text: "Hey Mat"
The function will write to /lastmodified
:
/functions-project-12345
/lastmodified: 1234567890
/chat
/key-123456
username: "Mat"
text: "Hey Bob!"
/key-123457
username: "Bob"
text: "Hey Mat"
Security Rules
The following security rules ensures only a Function with admin access can update the lastmodified
attribute.
{
"rules": {
"lastmodified": {
".write": "false",
".read": "true"
}
}
}