Forum Discussion

darshthakkar's avatar
darshthakkar
Valued Contributor
4 years ago
Solved

Preview not available for Flow snaps

Certain flow snaps like “Filter”, “Head”, “Tail” when used in a complex pipeline doesn’t generate a preview while validating the entire pipeline however these generate a preview if the pipeline is si...
pipeline
  • bojanvelevski's avatar
    bojanvelevski
    4 years ago

    What @dmiller probably meant, is, that the 50 records validating doesn’t meet the criteria in the filter.

    Try increasing the preview count.

    I’m pretty sure there’s nothing wrong with the Filter snap, and to prove that, you can try and add true as a filter expression and re-validate. You should see all 50 records passed through.

  • darshthakkar's avatar
    darshthakkar
    2 years ago

    There are a couple of things that needs to be taken into consideration here:

    Firstly, Snap Execution should be set to "Validate & Execute", any other settings wouldn't generate a preview for you.

    Secondly, change the Preview Document Count to Max i.e. 2000 as seen below:

    Thirdly, if you're dealing with a huge dataset let's say 50k and you only have 100 records out of 50k that satisfies the condition in the filter snap, you may or may not see them in the preview as the order of records displayed in preview is not guaranteed, you can use a SORT snap before filter if you know the first 50 will suffice the condition; if that's the case then you will see the output preview for sure.

    Thank you.

     

    Best Regards,

    Darsh

darshthakkar's avatar
darshthakkar
Valued Contributor
4 years ago

Sharing a snap below for your reference:

Even the successive snaps are not generating any preview which was happening before the flow snaps.

bojanvelevski's avatar
bojanvelevski
Valued Contributor
4 years ago

What @dmiller probably meant, is, that the 50 records validating doesn’t meet the criteria in the filter.

Try increasing the preview count.

I’m pretty sure there’s nothing wrong with the Filter snap, and to prove that, you can try and add true as a filter expression and re-validate. You should see all 50 records passed through.

  • darshthakkar's avatar
    darshthakkar
    Valued Contributor
    4 years ago

    Thank you @bojanvelevski for the suggestion. As far as I remember, the filter criteria has been kept in such a way that it should have passed all the records however lemme try your suggestion and keep you posted on this thread.

    Regarding a simple pipeline, preview worked as seen below:

    @dmiller: I tried with Shift + Validate but it didn’t work, I will go ahead with @bojanvelevski’s suggestion for now.

    • bojanvelevski's avatar
      bojanvelevski
      Valued Contributor
      4 years ago

      Please keep in mind that this expression will pass all of the records, and it’s just for debugging purposes.

      • darshthakkar's avatar
        darshthakkar
        Valued Contributor
        4 years ago

        Absolutely, thanks @bojanvelevski.
        Putting the condition as true worked, thanks a lot for your help 🙂

        Sharing the snap below for your references: