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John Stamers Writing an Apex trigger to create a child record
Hi all, I have a trigger that will create a new record in my object "subject" when a certain field on another object "volunteer" is updated. However, I would also like the subject to become a child record for the volunteer. Can someone provide some guidance as to how I can alter my current trigger?
Trigger copyVolunteertoSubject on Volunteer__c(after insert, after update)
{
List<Subject__c> sub=new List<Subject__c>();
for(Volunteer__c v : Trigger.new)
{
if(v.Volunteer_Status__c == 'Screening Complete')
{
Subject__c s=new Subject__c();
s.First_Name__c=v.First_Name__c;
s.Age__c=v.Age__c;
s.BMI__c=v.BMI__c;
s.City__c=v.City__c;
s.Country__c=v.Country__c;
s.Date_of_Birth__c=v.Date_of_Birth__c;
s.Email_Address__c=v.Email_Address__c;
s.Gender__c=v.Gender__c;
s.Height__c=v.Height__c;
s.Last_Name__c=v.Last_Name__c;
s.Phone_Number__c=v.Phone_Number__c;
s.Postal_code__c=v.Postal_code__c;
s.Province__c=v.Province__c;
s.Street_Address__c=v.Street_Address__c;
s.Weight__c=v.Weight__c;
s.Trial__c=v.Trial__c;
//add other fields of subject here and add volunteer values in that.
sub.add(s);
}
if(sub.size()>0)
insert sub;
}
}
Trigger copyVolunteertoSubject on Volunteer__c(after insert, after update)
{
List<Subject__c> sub=new List<Subject__c>();
for(Volunteer__c v : Trigger.new)
{
if(v.Volunteer_Status__c == 'Screening Complete')
{
Subject__c s=new Subject__c();
s.First_Name__c=v.First_Name__c;
s.Age__c=v.Age__c;
s.BMI__c=v.BMI__c;
s.City__c=v.City__c;
s.Country__c=v.Country__c;
s.Date_of_Birth__c=v.Date_of_Birth__c;
s.Email_Address__c=v.Email_Address__c;
s.Gender__c=v.Gender__c;
s.Height__c=v.Height__c;
s.Last_Name__c=v.Last_Name__c;
s.Phone_Number__c=v.Phone_Number__c;
s.Postal_code__c=v.Postal_code__c;
s.Province__c=v.Province__c;
s.Street_Address__c=v.Street_Address__c;
s.Weight__c=v.Weight__c;
s.Trial__c=v.Trial__c;
//add other fields of subject here and add volunteer values in that.
sub.add(s);
}
if(sub.size()>0)
insert sub;
}
}
For eample in the following code:
if(Trigger.isInsert){
List<Contact> ct = new List <Contact>();
for(Account acc : trigger.new){
Contact c = new Contact(LastName = acc.name,
AccountId=acc.id,
Fax=acc.Fax,
Phone=acc.Phone,
Email=acc.Email__c);
ct.add(c);
}
This is a trigger on account(contact is child) and the field AccountId on Contact takes the value of the account ID of the current Account and so the created contact becomes the account's child..
All Answers
For eample in the following code:
if(Trigger.isInsert){
List<Contact> ct = new List <Contact>();
for(Account acc : trigger.new){
Contact c = new Contact(LastName = acc.name,
AccountId=acc.id,
Fax=acc.Fax,
Phone=acc.Phone,
Email=acc.Email__c);
ct.add(c);
}
This is a trigger on account(contact is child) and the field AccountId on Contact takes the value of the account ID of the current Account and so the created contact becomes the account's child..
Trigger copyVolunteertoSubject on Volunteer__c(after insert, after update)
{
List<Subject__c> sub=new List<Subject__c>();
for(Volunteer__c v : Trigger.new)
{
if(v.Volunteer_Status__c == 'Screening Complete')
{
Subject__c s=new Subject__c(First_Name__c=v.First_Name__c,
Age__c=v.Age__c,
BMI__c=v.BMI__c,
City__c=v.City__c,
Country__c=v.Country__c,
Date_of_Birth__c=v.Date_of_Birth__c,
Email_Address__c=v.Email_Address__c,
Gender__c=v.Gender__c,
Height__c=v.Height__c,
Last_Name__c=v.Last_Name__c,
Phone_Number__c=v.Phone_Number__c,
Postal_code__c=v.Postal_code__c,
Province__c=v.Province__c,
Street_Address__c=v.Street_Address__c,
Weight__c=v.Weight__c,
Trial__c=v.Trial__c,
Volunteer__c=v.Name); //this is th field that contains the parent-child relationship
sub.add(s);
}
if(sub.size()>0)
insert sub;
}
}
However now I am getting the following error when the trigger executes:
Error:Apex trigger copyVolunteertoSubject caused an unexpected exception, contact your administrator: copyVolunteertoSubject: execution of AfterUpdate caused by: System.StringException: Invalid id: 000000017: Trigger.copyVolunteertoSubject: line 8, column 1