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mits430mits430 

Compareing object type using "Event.What.type" is not work

I'd like to compare Object type using "Event.What.type" in Trigger method.
Then I wrote some code. but, it didn't work rightly.

 

It rather seems "Event.What" was null.
How should I do that it work correctly. or please tell me other way.

 

Here is the code.

trigger TestTrigger on Event (after insert) {

	for (Event rec : Trigger.new) {
		// "rec.What" is null...
		if (rec.What.type == "ownCustonObject__c") {
		}
	}
	// ... some code

}
 
Would someone please reply this.
 
 
Mitsutaka.


Best Answer chosen by Admin (Salesforce Developers) 
HarmpieHarmpie
Not 100% sure if my suggestion here is the best approach to do this, but it will probably work:
 
1) Use a Schema.getGlobalDescribe to obtain all objects
2) Iterate over the objects and per object add the property 'keyPrefix' to a map (keyPrefix->objectname)
3) Then in you trigger, compare the first 3 positions of What.Id to the keys inside this map
4) Result is your object


All Answers
HarmpieHarmpie
Not 100% sure if my suggestion here is the best approach to do this, but it will probably work:
 
1) Use a Schema.getGlobalDescribe to obtain all objects
2) Iterate over the objects and per object add the property 'keyPrefix' to a map (keyPrefix->objectname)
3) Then in you trigger, compare the first 3 positions of What.Id to the keys inside this map
4) Result is your object
This was selected as the best answer
mits430mits430
Hi Harmpie.
 
I did it! 
Thank you very much that is exactly what I needed!  and result is so fine.
 
(Somehow, I thought that it might have to get a database definition.
but, I didn't know how to get it globally...)
 
 
and following is my code.
trigger TestTrigger on Event (after insert) {

    Map<String, String> s2o = new Map<String, String>();
    Map<String, Schema.SObjectType> schemas = Schema.getGlobalDescribe();
    Set<String> keys = schemas.keySet();

    // creating map that able to look up object name by key prefix.
    for (String key : keys) {
        Schema.SObjectType schema = schemas.get(key);
        Schema.DescribeSObjectResult d = schema.getDescribe();
        s2o.put(d.getKeyPrefix(), d.getName());
    }

    for (Event rec : Trigger.new) {
        if (rec.WhatId == null)
            continue;

        String prefix = ((String)(rec.WhatId)).substring(0,3);
        String objName = s2o.get(prefix);

        if (objName.equals('fooObject__c')) {
            // some process...
        }
    }
}
 
 
Mitsutaka.