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Kristiana GrangerKristiana Granger 

How to write trigger to create junction object record, for instance


My requirment is - Junction Object (Junction1__c) record should get created when user create new record on "Account"/"Location" object

Data model -
Account Obj 
M_number__c field

Location object
M_number__c field


Junction1 Object
Account__c (M-D Rel with Account)
location__c (M-D rel with location)

When user create new recrod on Account Or Location object, it should automatically create new Rec on Junction Obj
Bablu Kumar PanditBablu Kumar Pandit
Hii Kristiana ,
you have to write the trigger both Account and location becouse when you create Recode anywhere(Account/Location) Junction Object Recode shuold be Craeted.
  
public class accountClassTriggerHandler{
	public static void insertAccount(List<Account> lstacc){
	    List<Junction1__c> lstjunc = New List<Junction1__c>();
		for(Account objacc :lstacc){
			Junction1__c objjun = New Junction1__c();
			objjun.name = 'Test Junction Recode'; // you can map junction object name with account name like objun.name = objacc.name
			objjun.Account__c = objacc.Id;
			lstjunc.add(objjun);
		}
		if(lstjunc.size() > 0){
			insert lstjunc;
		}
	}

}

public class LOcationClassTriggerHandler{
	public static void insertlocation(List<Location__c> lstloc){
	    List<Junction1__c> lstjunc = New List<Junction1__c>();
		for(Location__c objloc :lstloc){
			Junction1__c objjun = New Junction1__c();
			objjun.name = 'Test Junction Recode'; // you can map junction object name with account name like objun.name = objloc.name
			objjun.location__c = objloc.Id;
			lstjunc.add(objloc);
		}
		if(lstjunc.size() > 0){
			insert lstjunc;
		}
	}

}

trigger AccountTrigger on Account(After insert){
	if(Trigger.isInsert && Trigger.isAfter){
		accountClassTriggerHandler.insertAccount(Trigger.New);
	}
}

trigger LocationTrigger on location__c(After insert){
	if(Trigger.isInsert && Trigger.isAfter){
		LOcationClassTriggerHandler.insertlocation(Trigger.New);
	}
}

Thanks Bablu