How to write the Salesforce Trigger for a Custom Object’s Attachment?

Hi Archit,

To write a trigger on Attachment you have to use Eclipse. Open your Org in Eclipse then create a new trigger where you will get a picklist to select the Attachment Object. This is the only the way to write a trigger on Attachment. Below is the sample code of the trigger :

// Trigger to update the Attachment__c custom checkbox field in Custom Object(Custom_Obj__c) if it has any attachment.

trigger TiggerName on attachment (after insert)

{

List<Custom_Obj__c> co = [select id, Attachment__c from Custom_Obj__c where id =: Trigger.New[0].ParentId];

if(co.size()>0)

{

co[0].Attachment__c = true;

update co;

}

}

Hope this helps you.

Please let me know if this works out.