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Anton-X
Advocate II
Advocate II

Error "multiple levels of many-to-one relationship expansion aren't supported"

Hi,

This is for 'Build A Canvas App' video #5: 'Connect to Loans table data in my canvas app' starting at 11m 0s.

 

I'm not sure if I understand the concept of the formula that makes it work . . . limiting the lookup at not more than 2 levels.

I found this article to help me understand, but it's still confusing:

 

Dataverse - How to work around the error "multiple levels of many-to-one relationship expansion aren... 

 

But, it seems when I test the incorrect way on the AuthorName column, it works OK, and appears to be more than 2 levels.

Can you help me to see what I'm missing?

 

Q: The first image below shows how I'm understanding the BookImage scenario. Is this correct?

Q: Then, below that you'll see how I'm understanding the AuthorName scenario. Why does AuthorName work OK without the Lookup function when it has more levels?

 

BOOK IMAGE:

DataverseLookupMoreThan2LevelsDeep.jpg

 

AUTHORNAME:

Shouldn't this throw the same error because of the number of levels deep?

DataverseLookupMoreThan2LevelsDeep2.jpg

Can you see how it appears that accessing the 'AuthorName' has one more level than when accessing 'BookImage'? But, no errors are thrown.

1 ACCEPTED SOLUTION

Accepted Solutions
BCBuizer
Multi Super User
Multi Super User

Hi @Anton-X ,

 

Your understanding and analysis seem correct.

 

The fact that the second scenario does work is probably due to an undocumented feature: Canvas apps using Dataverse now support multiple-levels of ma... (hubsite365.com)

 

Also I wouldn't be surprised that it currently only works for the second scenario because of the involved column types: Image type for BookImage and Text type for AuthorName.

 

@timl : Anything I may be missing here?



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3 REPLIES 3
BCBuizer
Multi Super User
Multi Super User

Hi @Anton-X ,

 

Your understanding and analysis seem correct.

 

The fact that the second scenario does work is probably due to an undocumented feature: Canvas apps using Dataverse now support multiple-levels of ma... (hubsite365.com)

 

Also I wouldn't be surprised that it currently only works for the second scenario because of the involved column types: Image type for BookImage and Text type for AuthorName.

 

@timl : Anything I may be missing here?



Did you like my post? Please give it a thumbs up! Did I resolve your issue? Please click Accept as Solution to close the topic and so other members of the community can find solutions more easily.
timl
Super User
Super User

Hi @BCBuizer 

Thanks for tagging me. I think you're correct about the 2nd scenario probably working due to that feature. 

Thanks @BCBuizer and @timl for pointing out that new feature to me.

Maybe they'll expand it to the image type later on.

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