Passing an variable from flow to @InvocableMethod

Question

I am super close to getting this process to work, however, I am a little unclear as to how to deal with the @invocableVariable portion of the process. And just to preface... I am NOT a coder, like at all, so this has been a labor for me.

When I run debug in my flow, it all runs through properly and creates the proper number of records when I change 'LIMIT :NumberOfRecords' to a literal number, like '3'. But I would like to pass a value to the class in an @InvocableVariable titled NumberOfRecords and have it use it in the query.

I have looked at a million examples, but just can't seem to put it to practice.

Any direction would be GREATLY appreciated! Please see my example code below:

public class InvocableAuditDraft {


@InvocableMethod(label='Select Accounts for Audit'
              description='Returns a list of accounts eligible for an Audit.'
              category='Account')    

public static List<List<Account>> getAccountIds(List<ID> ids) {
List<List<Account>> accountList = new List<List<Account>>();
List<Account> accountIds = [SELECT Id FROM Account where Status__c = 'Open' LIMIT 5000];
 
Integer count = accountIds.size();
Integer rand = Math.floor(Math.random() * count).intValue();
List<Account> accounts = [SELECT Id FROM Account WHERE Id in :accountIds LIMIT :NumberOfRecords OFFSET :rand];
accountList.add(accounts);

return accountList;
}

public class FlowInputs {

    @InvocableVariable(required=true)
    public String NumberOfRecords;
}   

}

Answer 1

Your invocable method is defined as:

public static List<List<Account>> getAccountIds(List<ID> ids)

That means that it expects only a list of accountIds as input, one accountId per Flow Interview. (Apex Actions are implicitly bulkified by Flow)

If you want to pass an Id and a LIMIT, you need to change your invocable method signature to:

public static List<List<Account>> getAccountIds(List<FlowInput> inputs)

and change the definition of your FlowInputs class to

public class FlowInput {

  @InvocableVariable(required=true)
  public String NumberOfRecords;

  @InvocableVariable(required=true)
  public Id accountId; 
}

You'll then need to loop through inputs and decide how to process. Each element of input could conceivably have a different row limit so that presents some design challenges as you don't want to do a separate SOQL per input.

It is also not clear to me that you want to pass back a list of accounts per each input accountId but your application requirements are not clear. This also suggests changing the method name to getAccounts