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shikher jain I created two custom classes class and student. I want to create a trigger for updating some values and delete related students
trigger CustomStatusChanged on Class__c (before update) {
for(Class__c cls : trigger.new){
if(cls.Custom_Status__c == 'Reset'){
delete [Select Name from Student__c where Class_object__c in :trigger.new];
}
}
}
I have written this code but got self reference error
for(Class__c cls : trigger.new){
if(cls.Custom_Status__c == 'Reset'){
delete [Select Name from Student__c where Class_object__c in :trigger.new];
}
}
}
I have written this code but got self reference error
Generally, soql queries inside a loop is not considered as a best practice that is why I was suggesting the above method.
As your implementation could change this was one way I thought this can be implemented.
You can find something similar in the link :- [ https://salesforce.stackexchange.com/questions/45566/deleting-child-records-on-a-parent ]
I hope this helps.
All Answers
Can you try putting the necessary records in a list and then delete do a DML operation after the loop, let me know if this works and you are doing a soql for every value is an iteration in the trigger.new can you try minimizing it by adding the classes id or such to a set then get the student records that match it and then delete them after the loop.
Do let me know if this helps and in case if it does can you mark this as the best answer so that it can be used by others in the future.
Regards,
Anutej
Generally, soql queries inside a loop is not considered as a best practice that is why I was suggesting the above method.
As your implementation could change this was one way I thought this can be implemented.
You can find something similar in the link :- [ https://salesforce.stackexchange.com/questions/45566/deleting-child-records-on-a-parent ]
I hope this helps.
A self-reference error occurs when you attempt to delete a record and the record being deleted is also referenced in the trigger context. In your trigger, you delete the related Student__c records where Class_object__c is in trigger.new. However, trigger.new is a list of Class__c records, and you cannot use it to filter related Student__c records.
To fix this, you need to create a separate list to store Class_object__c values and use that list to filter related Student__c records.