OH3: Is there a way find all items that are NULL?

  • openHABian 3.3.0 on rPi4 with 4GB

I have recently migrated from OH1/2 to OH3. With almost 1,000 items, I wonder if there is a way to list all items that have a state of NULL.

I could check this now, to see what should be initialised and isn’t, and run this post a reboot to see what has no persisted value attached to it.

depends on your chosen scripting language.

In jruby:

logger.info items.reject(&:state?).map(&:name)

This will give you the list of items that are NULL or UNDEF

If you specifically want just NULL:

logger.info items.select(&:null?).map(&:name)

Or just UNDEF:

logger.info items.select(&:undef?).map(&:name)

In Rules DSL:

import org.eclipse.smarthome.model.script.ScriptServiceUtil


    // inside a rule
    val allNullItems = ScriptServiceUtil.getItemRegsitry.getItems.filter[ i | i.state == NULL]

Nashorn JavaScript

var Collectors = Java.type("java.util.stream.Collectors");

var allNullItems = items.stream().filter(function(i) { return i.state == NULL; } ).collect(Collectors.toList());

JS Scripting

var allNullItems = items.getItems().filter((i) => { return i.state == "NULL"; });
1 Like

in openHAB 3.4.0y the import must be named

import org.openhab.core.model.script.ScriptServiceUtil

In the solution, there is a small error in the command “getItemRegistry” for the RuleDSL. It should be

val allNullItems = ScriptServiceUtil.getItemRegistry.getItems.filter[ i | i.state == NULL]