[SalesForce] Is it possible to dynamically set properties of an `Object` using Apex

Background

I would like to be able to dynamically set properties of an Object (not SObject).

Given this class:

public class Invoice {
    public String Ref { get; set; }
}

I would like to be able to do this:

Invoice inv = new Invoice();
inv.put('Ref', 'REF123');

But when I do Execute Anonymous Apex with above code, I this error:

ERROR: Compilation failed.
! ERROR: Line: 3, Column: 12
! Method does not exist or incorrect signature: void put(String, String)
! from the type Invoice
ERROR: Execution failed.

Question

Is it possible to dynamically set properties of an Object (not SObject) using Apex?
How would I dynamically set a property of an Object using Apex?

Best Answer

For some isolated cases - yours is one of them - there is this (ab)use of the serialize methods:

Invoice inv = (Invoice) JSON.deserialize(JSON.serialize(new Map<<String, Object>{
    'Ref' => 'REF123'
})), Invoice.class);

Here, the capability of JSON.deserialize to create an instance of the specified type and set the properties of the instance is being used.

But in general, Apex is missing the map-like behavior for objects or a reflection API.

Related Solutions

[SalesForce] Pass inner class object as an argument to apex class

The method testInnerMethod is defined in the nested TestInner class not the TestInner.InnerA class so this should work:

public static testMethod void testInnerClassRef(){        
    TestInner.InnerA innerA = new TestInner.InnerA();
    innerA.a = 'XYZ';
    innerA.b = 'POR';
    TestInner testInner = new TestInner();
    testInner.testInnerMethod(innerA);
}

[SalesForce] Execute Anonymous Error: Getting Started with Apex

Seems 100% like a your EmailManager failed to compile. Normally you would see errors similar to this one if you declared your method static and called it the way you did:

// won't work, can't call static method from instance
public class MyClass
{
    public static void myMethod(/*params*/) { /*implementation*/ }
}

// script
new MyClass().myMethod(/*params*/);

Or if you declared it an instance method and tried to call it statically:

// won't work, can't call instance method statically
public class MyClass
{
    public void myMethod(/*params*/) { /*implementation*/ }
}

// script
MyClass.myMethod(/*params*/);

Best Answer

Related Solutions

[SalesForce] Pass inner class object as an argument to apex class

[SalesForce] Execute Anonymous Error: Getting Started with Apex

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