Skip to main content
cancel
Showing results for 
Search instead for 
Did you mean: 

The ultimate Microsoft Fabric, Power BI, Azure AI & SQL learning event! Join us in Las Vegas from March 26-28, 2024. Use code MSCUST for a $100 discount. Register Now

Reply
Anonymous
Not applicable

How do I make this loop all children recursively?

Hello guys,    i have a function ("flecheD")

(ColChild,ColParent,ParentActuel,source)=>
                    let
                    mylist=Table.Column(Table.SelectRows(source,each Record.Field(_,ColParent)=ParentActuel),ColChild),
                    resultat=Text.Combine(mylist)
                    in
                   
                   Text.Trim(
                    if resultat ="" then ""  else @ resultat &"|" & @ flecheD(ColChild,ColParent,resultat,source),"|")

 which loops through 2 columns (Parent,Child) to get all children of the main parent (output->Children column). The problem is that when the function is confronted with several children, the result variable no longer has a single letter/child but several, which blocks the function from looking for the other children. Can you help me to solve this problem thanks,Capture d'écran_20221205_183438.png

 

file :https://docs.google.com/spreadsheets/d/1H0cI9XkgkOQ8R0cI2aE35GmEiV_U_zv4/edit?usp=sharing&ouid=10524... 

 

@Anonymous 

1 ACCEPTED SOLUTION
ppm1
Solution Sage
Solution Sage

Please try this function. Seems to be do what you are looking for.

ppm1_0-1670465769957.png

 

(inputtable as table, searchvalue as text, inputtext as text)=>
let 
input = searchvalue,
childrows = try Table.SelectRows(inputtable, each [Parent] = input)[Child] otherwise {},
output = if List.IsEmpty(childrows) then inputtext & Text.Combine(childrows, "") else Text.Combine(childrows, "") & Text.Combine(List.Transform(childrows, each @fnParentChild(inputtable, _, "")), "|")
in 
output

 

If needed, you can see it with your data, you can put this in a blank query.

let
    Source = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("i45WclTSUXIC4oAgfxcQ08s5VClWJ1rJGchxQYi71HiChUHKvbAo98Kt3BmLcpB4KBZxEMcTIQ40JBYA", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type nullable text) meta [Serialized.Text = true]) in type table [Parent = _t, Child = _t, Param = _t, Children = _t]),
    #"Changed Type" = Table.TransformColumnTypes(Source,{{"Parent", type text}, {"Child", type text}, {"Param", type text}, {"Children", type text}}),
    #"Added Custom" = Table.AddColumn(#"Changed Type", "Custom", each let par = [Parent] in fnParentChild(#"Changed Type", par, ""))
in
    #"Added Custom"

Pat

Microsoft Employee

View solution in original post

3 REPLIES 3
ppm1
Solution Sage
Solution Sage

Please try this function. Seems to be do what you are looking for.

ppm1_0-1670465769957.png

 

(inputtable as table, searchvalue as text, inputtext as text)=>
let 
input = searchvalue,
childrows = try Table.SelectRows(inputtable, each [Parent] = input)[Child] otherwise {},
output = if List.IsEmpty(childrows) then inputtext & Text.Combine(childrows, "") else Text.Combine(childrows, "") & Text.Combine(List.Transform(childrows, each @fnParentChild(inputtable, _, "")), "|")
in 
output

 

If needed, you can see it with your data, you can put this in a blank query.

let
    Source = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("i45WclTSUXIC4oAgfxcQ08s5VClWJ1rJGchxQYi71HiChUHKvbAo98Kt3BmLcpB4KBZxEMcTIQ40JBYA", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type nullable text) meta [Serialized.Text = true]) in type table [Parent = _t, Child = _t, Param = _t, Children = _t]),
    #"Changed Type" = Table.TransformColumnTypes(Source,{{"Parent", type text}, {"Child", type text}, {"Param", type text}, {"Children", type text}}),
    #"Added Custom" = Table.AddColumn(#"Changed Type", "Custom", each let par = [Parent] in fnParentChild(#"Changed Type", par, ""))
in
    #"Added Custom"

Pat

Microsoft Employee
v-yanjiang-msft
Community Support
Community Support

Hi @Anonymous ,

Please see if this document can help: Loops in Power Query M language (potyarkin.ml)

Best Regards,
Community Support Team _ kalyj

Anonymous
Not applicable

Hi @v-yanjiang-msft , thx for your suggestion. So  I tried to create a custom function "SubChilldren" with List.Generate()

(children as text, ColChild,ColParent,source)=>
let 
i = 1,
length = Text.Length(children),

subchildren =  List.Generate( ()=>@flecheD(ColChild,ColParent,Text.At(children,i-1),source),   i<=length, i+1  )
in 
Text.Combine(subchildren)

which when coupled with my initial function

(ColChild,ColParent,ParentActuel,source)=>
                    let
                    mylist=Table.Column(Table.SelectRows(source,each Record.Field(_,ColParent)=ParentActuel),ColChild),
                    resultat=Text.Combine(mylist)
                    in
                   
                   Text.Trim(
                    if resultat ="" then ""  else if Text.Length(resultat) = 1 then  @ resultat &"|" & @ flecheD(ColChild,ColParent,resultat,source)
                    else     @resultat &"|"& SubChildren(resultat,ColChild,ColParent,source),"|")

  should normally get the sub-children  of each children. However, it still doesnt work 😅. Could you please help me . Thx

 

source link : https://docs.google.com/spreadsheets/d/1nbF7-ZBZNMCmHdzSqqfBdHCPNqdWfKGa/edit?usp=sharing&ouid=10431... 

@Gop01

Helpful resources

Announcements
March Fabric Community Update

Fabric Community Update - March 2024

Find out what's new and trending in the Fabric Community.

Fabric Community Conference

Microsoft Fabric Community Conference

Join us at our first-ever Microsoft Fabric Community Conference, March 26-28, 2024 in Las Vegas with 100+ sessions by community experts and Microsoft engineering.

Fabric Partner Community

Microsoft Fabric Partner Community

Engage with the Fabric engineering team, hear of product updates, business opportunities, and resources in the Fabric Partner Community.

Top Solution Authors
Top Kudoed Authors