Problem Statement

I'm working on a fluent email builder, but I've hit a bit of a snag. Namely, there does not seem to be any simple way to completely clone a Messaging.SingleEmailMessage instance without sharing a reference.

Why would I want to do such a thing? Well, it seems pretty common to have a collection of emails with common properties such as subject, recipients, template, etc.



The simplest attempt code-wise would be to serialize and de-serialize to break the reference:

Messaging.SingleEmailMessage email = new Messaging.SingleEmailMessage();
Messaging.SingleEmailMessage clone = (Messaging.SingleEmailMessage)
    JSON.deserialize(JSON.serialize(email), Messaging.SingleEmailMessage.class);

However, this code throws a run-time error:

System.JSONException: Unrecognized field "debug" at [line:1, column:83]

Apparently it is not even possible to re-serialize back to the same type here!


Fine, I thought, I'll just use all of the getters and manually copy over each property:

Messaging.SingleEmailMessage email = new Messaging.SingleEmailMessage();
// set various properties

Messaging.SingleEmailMessage clone = new Messaging.SingleEmailMessage();
// and so on

However, a couple Boolean flags on this object lack getters:

Method does not exist or incorrect signature: [Messaging.SingleEmailMessage].getTreatBodiesAsTemplate()

Method does not exist or incorrect signature: [Messaging.SingleEmailMessage].getTreatTargetObjectAsRecipient()


Is there any simple or elegant way to clone a Messaging.SingleEmailMessage instance? I'm pursuing other design routes (like making the builder virtual) but it's frustrating to not be able to clone such a basic system object. The only way I can think to do it would be to pull out the properties from an untyped map, which is not a satisfying long term solution:

Messaging.SingleEmailMessage email = new Messaging.SingleEmailMessage();
Map<String, Object> data = (Map<String, Object>)
Boolean treatBodiesAsTemplate = data.get('treatBodiesAsTemplate');
Boolean treatTargetObjectAsRecipient = data.get('treatTargetObjectAsRecipient');
  • Well, not sure about cloning but the TreatTargetObjectAsRecipient and TreatBodiesAsTemplate boolean flags are public and can be accessed by email.TreatBodiesAsTemplate. – Santanu Halder Apr 19 '17 at 18:17
  • 1
    Ah, that's strange they have a different access pattern...wasn't aware of that. That's good enough for my purposes, and I would be happy to accept that as an answer. – Adrian Larson Apr 19 '17 at 18:23
  • yup, been there, faced that! Anyway, glad I was of help. :) – Santanu Halder Apr 19 '17 at 18:29

Regarding your getter/setter approach, the TreatTargetObjectAsRecipient and TreatBodiesAsTemplate boolean flags are having public access modifier and can be accessed as follows:

Messaging.SingleEmailMessage email = new Messaging.SingleEmailMessage();
Boolean treatBodiesAsTemplate = email.treatBodiesAsTemplate;
Boolean treatTargetObjectAsRecipient = email.treatTargetObjectAsRecipient;

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