[SalesForce] Convert a Set to Set using Apex

I have a Set<Id> which I want to convert to a Set<String>. I don't want to use a for loop to iterate over it. What is the simplest way to do this?

Best Answer

Here's a clever (ugly) one-liner.

Set<Id> ids = new Set<Id>{'001C000001DgWjE','001C000001DgWjD'};

// Here's the one line!
Set<String> idStrs = (Set<String>)JSON.deserialize(JSON.serialize(ids), Set<String>.class);

System.debug('idStrings=' + idStrs);

Related Solutions

[SalesForce] Elegant way to convert Set into String for Dynamic SOQL IN comparison

Believe it or not bind variables actually work in dynamic SOQL:

Map<Id,Account> accts = new Map<Id,Account>([select Id from Account]);
Set<Id> accountIds = accts.keySet();
String q = 'select id from Contact where AccountId in :accountIds';
List<Contact> cts = Database.query(q);

Note that you can't embed method calls (e.g. AccountId in :accts.keySet() would fail) when binding in this way.

This is a very, very good way of doing things as it offers a massive reduction in script statements, heap space, and even added security by automatically escaping input. I believe it also means that the bind data doesn't count against the 10k SOQL query character limit.

~~I can confirm there are a number of ISV apps that are dependent on this so there's no way salesforce could remove it in a future version without a massive outcry.~~ This method is actually salesforce endorsed!

Also, see this question if you're having trouble with more complex uses, in short: you can only use an in-scope variable, not an actual expression with these binds.

[SalesForce] Convert and add list of string to set of ID

JSON is a CPU hog; you may as well loop over your Set and cast each element individually at that point. You should not use JSON for converting a list to a set or vice versa. As an aside, you're also abusing a compiler bug by casting a List<String> to a List<Id>. You should be prepared for runtime exceptions if you do this. Realistically, you should fix the delegationDataMap to be Map<String, Set<Id>> if it really is meant to be a set of Id values.

Best Answer

Related Solutions

[SalesForce] Elegant way to convert Set into String for Dynamic SOQL IN comparison

[SalesForce] Convert and add list of string to set of ID

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