Retrieving field dynamically from anonymous object

apexcustom-objectdynamic-apexinheritanceobject

I have a scenario where I need to dynamically retrieve fields from a custom object, in which I don't know the type. For the following code, the query is passed in from somewhere else, I just wrote it out for the purposes of this example.

This code works, however, the type is obviously explicit:

House__c o = Database.query('Select Id, NumberOfRooms__c from House__c limit 1');
System.debug(o.get('NumberOfRooms__c'));

So I thought I could write this code:

Object o = Database.query('Select Id, NumberOfRooms__c from House__c limit 1');
System.debug(o.get('NumberOfRooms__c'));

But I get the following error:

Error: Method does not exist or incorrect signature: void get(String)
from the type Object

It looks like the .get() method isn't available on object, but is available on custom objects. Is this inherited from a class higher up in the hierarchy? If so, what can I cast o to to get this method?

Or, alternatively, is there another way to dynamically retrieve the value of fields on the object type?

Best Answer

Change Object to SObject

SObject o = Database.query('Select Id, NumberOfRooms__c from House__c limit 1');
System.debug(o.get('NumberOfRooms__c'));

SObject class has get method to dynamically get field value.

Any standard/custom object extends SObject and SObject extends Object

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[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*/);

[SalesForce] Method does not exist or incorrect signature: void containsKey(Id) from the type Set

For the first one, instead of:

affectedCasesByContactId.keyset().containsKey(...)

use either the Map method containsKey on the Map:

affectedCasesByContactId.containsKey(...)

or the Set method contains on the Set:

affectedCasesByContactId.keyset().contains(...)

For the second one instead of trying to access from the List:

trigger.new.get(...)

access from the Map:

trigger.newMap.get(...)

Take a look at the available Trigger Context Variables and also do some Googling about lists and maps to get clear about how to use those most effectively.

Best Answer

Related Solutions

[SalesForce] Execute Anonymous Error: Getting Started with Apex

[SalesForce] Method does not exist or incorrect signature: void containsKey(Id) from the type Set

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