Using nested list to filter nested table

[MichaelHalling]

In my main table [FilterListZC] I have a column [FilterZC] which contains nested lists, and a column [Selected] of nested tables. Each nested table in [Selected] contains a column [TenorCode] I would like to filter with the values in the corresponding list in [FilterZC].

I have tried various solutions but none work. Here is an example of one that does not work:
= Table.AddColumn(FilterListZC, "FilteredZC", each Table.SelectRows([Selected], each List.Contains( (r)=> [FilterZC], [TenorCode])))

Is this possible? What do I need to change? 

Thanks a million for any help!

[MFelix]

Hi @MichaelHalling ,

The best person to help you with this is @ImkeF the best M language user in the community.

@ImkeF  can you please check this question.

[ImkeF · Accepted solution]

Hi @MichaelHalling ,

you can try the following, otherwise please provide sample data:

Table.AddColumn(FilterListZC, "FilteredZC", each Table.SelectRows([Selected], (r) => List.Contains( FilterZC], r[TenorCode])))

[MichaelHalling]

@ImkeFYou are amazing! That worked! Don't really know what r[TenorCode] does but it solved my problem. Also gotten a few helpful tips from your blog before this so a big THANK YOU for all your work. @MFelix Thanks for caring 🙂

PS. You missed a '[ ' in [FilterZC] so for anyone reading this, this is the exact code that solved my problem. 

Table.AddColumn(FilterListZC, "FilteredZC", each Table.SelectRows([Selected], (r) => List.Contains( [FilterZC], r[TenorCode])))

[ImkeF]

Hi @MichaelHalling ,

very pleased to hear 🙂

And thanks for the correct code, I did mine on top of my head.

With regards to r[Tenor]: There is a bit of syntax sugar in the M-language that obfuscates what's really going on:

- https://docs.microsoft.com/en-us/powerquery-m/understanding-power-query-m-functions

- https://ssbi-blog.de/blog/technical-topics-english/the-environment-concept-in-m-for-power-query-and-...