What if No input is coming to Mapper

[SandeepVemula]

I have a mapper and I have a expression as below

$.hasOwnProperty(‘query’) ? $query : ‘not present in input’

The expression is working fine if input comes to mapper. But if there is no input/input doest contain query it should return ‘not present in input’. ‘not present in input’ is coming if input doesnt contain query. This should work if no input is passed to Mapper right. If that is not the case how can I overcome If no input is passed to mapper.

Tried “snap.in.totalCount” also. No result.

[brettdorsey · Accepted solution]

Sandeep,

Many snaps will do nothing if there is no input at all from a previous snap. In order to get around this, you can create a JSON Generator to produce a dummy document and merge it with your normal input using the JOIN snap. Check the link below for an example.

Performing an Action when there is no data Designing Pipelines

A common integration pattern is to do something when no data is received. For example, we might read a file, parse it, and find that no records meet some filter criteria. As a result, we might send an email, or insert a ticket into a ticket management system like ServiceNOW. However, in SnapLogic, this can be somewhat more difficult than it seems initially because of the streaming architecture. In fact, many snaps will not execute without input documents - rather hard to accomplish when there i…

[SandeepVemula]

@brettdorsey, Got your point and Implemented the same…