Need Help merging two collections

[Becca51178]

I have one list of events people can sign up for, and another list of the total people who have signed up for an event. 

The first collection works. It sums the total signers for an event. 

ClearCollect(TotalSignees, AddColumns(GroupBy(SignUpList, "EventName", "TotalSignees"), "NumOfSignUps", Sum(TotalSignees, EventName = EventName)));

The second collection does not work. It's adding a number to every item on the list regardless of the event

ClearCollect(ProjectSignUpListWithVolunteerCount, AddColumns(ProjectsEventsList_SPList, "NumOfSignUps", LookUp(TotalSignees, EventName=EventName, NumOfSignUps)));

All I want to do is merge the collections and if there is match insert that number into the column and if there there are no matches add a zero

[mdevaney · Accepted solution]

@Becca51178
Would adding some disambiguation to EventName like I’ve done below do the trick?

ClearCollect(ProjectSignUpListWithVolunteerCount, AddColumns(ProjectsEventsList_SPList, "NumOfSignUps", LookUp(TotalSignees, EventName=EventName[@ ProjectsEventsList_SPList], NumOfSignUps)));

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[WarrenBelz]

Hi @Becca51178 ,

You can merge two collections with the same field names by collecting them separately and then doing ClearCollect(Collection1,Collection2).

You can use RenameColumns and AddColumns to achieve this result. 
Here is a post to read on it. 

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[Becca51178]

@mdevaney I am getting this error

[Becca51178]

@mdevaney 

Thank you!

This Worked

ClearCollect(ProjectSignUpListWithVolunteerCount, AddColumns(ProjectsEventsList_SPList, "NumOfSignUps", LookUp(TotalSignees, EventName = ProjectsEventsList_SPList[@EventName], NumOfSignUps)));

[mdevaney]

@Becca51178
You are right. I’ll make that small edit to the solution when I get home in an hour.