[SOLVED] Merge item.name by different strings

[Phil100Vol (Philipp)]

Hey Openhab community - I need your help,

i want to ask each member of a ‘humidity’ group for there state and if the state exceeds a specific value a rule shall switch another item to ON. The name of the other item is defined by the members name.

Items:

Group ghumidity
Number SZ_humidity "SZ [%.1f %%]" <humidity> (ghumidity)
Switch SZ_humidity_warning "[MAP(warnings.map):%s]" <humidity>

Rules:

var humidity_Grenzwert = 70

rule "Warnung Luftfeuchtigkeit über Grenzwert"

when
	Time cron "0/5 * * * * ?"
then
	ghumidity.members.forEach [i|
	if (i.state > humidity_Grenzwert) {
		logInfo("Humidity Group", i.name + " beträgt " + i.state.toString + "%");
                sendCommand(i.name + "_warning" , ON)
		
	}
	]
end

sendCommand(i.name + “_warning” , ON) don’t work. Like you can see above I defined an item for warnings for each member of the group ghumidity.

Is there a possibility to merge the itemsname with the suffix “_warning” from different strings - like sendCommand(i.name + “_warning” , ON)?

Or do you have another solution in mind?

Thanks for your help!
Phil

[rossko57]

@Phil100Vol

sendCommand(i.name + “_warning” , ON) don’t work.

What does it do? (openhab.log error message)
What does i.name + “_warning” look like? (openhab.log logInfo message)

Why not run your rule anytime one of the member Items changes, rather than by clockwork.
Then, you could only check the one that changed.

Design Pattern: Working with Groups in Rules

Please see Design Pattern: What is a Design Pattern and How Do I Use Them for how to read and use DPs. Problem Statement Often one finds a number of Rules that are very similar and that all work on similar Items resulting in a lot of duplicated code. One way to solve this problem is through the use of Groups. Concept [image] This DP is not a standard DP in that it provides a single concrete template to follow to solve a specific problem. Instead this DP is more of a grand exploration of some …

[rlkoshak (Rich Koshak)]

As rossko57 indicates, don’t use a cron trigger. Just trigger the Rule when ever one of the humidity Items changes. Then you can issue your warning.

when
    Member of ghumidity changed
then
    if((triggeringItem.state as Number) > humidity_Grenzwert){
        sendCommand(triggeringItem.name+"_warning", "ON")
    }
end

Notice the minor changes. The “as Number” may not be required but putting quotes around the ON is required when using the sendCommand Action. It can only accept Strings. As rossko57 indicated, you would have seen errors in the logs.

[Phil100Vol (Philipp)]

Thanks for your quick and 100%working help ! I will have a look at the Design Patterns.

I misunderstood the error message of the not existing quotes “ON”.

Phil