Summary
The execution order between before-save Flows and validation rules in Salesforce can be crucial when dealing with record updates. In the case of a before-save record-triggered Flow updating a required field that is also checked by a validation rule, the Flow may sometimes fail with a FIELD_CUSTOM_VALIDATION_EXCEPTION. Understanding the correct execution order and how Salesforce handles these scenarios is key to avoiding such exceptions.
Root Cause
The root cause of the FIELD_CUSTOM_VALIDATION_EXCEPTION in this scenario can be attributed to the following:
- The before-save Flow updates the record, potentially triggering validation rules.
- Validation rules are checked after the Flow has executed, but before the record is saved.
- If the validation rule fails, a FIELD_CUSTOM_VALIDATION_EXCEPTION is thrown, causing the Flow to fail.
Why This Happens in Real Systems
This issue occurs in real systems due to the complexity of Salesforce automation and the interplay between different automation tools such as Flows, validation rules, and triggers. When multiple automations are involved, the execution order can become critical, and understanding how each tool interacts with others is essential for designing robust and reliable automation processes.
Real-World Impact
The real-world impact of this issue includes:
- Failed record updates: The FIELD_CUSTOM_VALIDATION_EXCEPTION can prevent records from being updated, leading to data inconsistencies.
- Incomplete automation: Flows that fail due to validation rule exceptions may not complete their intended tasks, affecting business processes.
- Debugging challenges: Identifying the root cause of the issue can be time-consuming, especially in complex automation scenarios.
Example or Code
// Example of a before-save Flow in Salesforce using PHP
$record = new SalesforceRecord();
$record->Id = '001d300000000abc';
$record->Required_Field__c = 'Updated Value';
try {
$record->update();
} catch (Exception $e) {
if ($e instanceof Salesforce FIELD_CUSTOM_VALIDATION_EXCEPTION) {
// Handle validation exception
}
}How Senior Engineers Fix It
Senior engineers fix this issue by:
- Understanding the execution order: Knowing when Flows, triggers, and validation rules are executed helps in designing the automation process.
- Using conditional statements: In Flows, using conditional statements to check if the validation rule will pass before updating the record can prevent exceptions.
- Optimizing validation rules: Reviewing and optimizing validation rules to ensure they are not too restrictive can also help in preventing unnecessary exceptions.
Why Juniors Miss It
Junior engineers may miss this issue due to:
- Lack of understanding of Salesforce automation: Not being familiar with the intricacies of Salesforce automation tools and their execution order.
- Insufficient testing: Not thoroughly testing the automation process to identify potential exceptions and edge cases.
- Overlooking validation rules: Failing to consider the impact of validation rules on the automation process, leading to unexpected exceptions.