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To get a set of Ids from a list of Contacts for example, I could:

  1. Query for the List of sObjects
  2. Create a map from my list using the constructor
  3. Use the map.KeySet() method to get my set.

Does anyone know of a more efficient design pattern?

I ultimately want a set to pass off to an @future method.

John Thompson
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  • You can also consider using the Queueable interface for your use case, which allows passing non-primitive data types to asynchronous methods: https://www.salesforce.com/us/developer/docs/apexcode/Content/apex_queueing_jobs.htm

    I feel there's a sentiment among the SFDC developer community to stop using @future in favor of Queueable as well.

     – kbentsen May 18 '15 at 20:25

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