Batch node use case example

General
1

Hi ,

I am a newbie to node-red and I am trying to understand the usages of each node . I couldn't find any examples around batch node to understand the use case where the node fits in . I read through the brief definition and the 3 modes of operation which technically able to understand but on a realtime use case I am not able to find a story.

When I tried using the batch node with debug i could see the output from batch node but I was in an assumption that each batch is having specific unique id. But the response I am observing is all having same id (message id).

Flow

Inject node --> Function node(code give below) --> batch node(sequence by number of message ,set as 2) --> Debug node

Function node code

for(var i=0; i<4 ;i++){
node.send({payload:i});
}
return msg;

Could you please share any examples or link directing to the usage of a batch node.

Regards
Arun

2

When debugging, use the 'complete msg object' to see the full message.

The batch node is used in conjunction with the join node. Each message in the batch gets a msg.parts with an index and a count number. The join node can use the index and the count to create a (new) merged object, new string, array etc.

3

Thanks @bakman2 for the quick response.

Let me give a try in conjunction with the join node.

Regards
Arun