Enforcing sharing
Once we have our sharing mechanisms set up within the system, we need to ensure that they are being enforced and followed throughout the application. There is no point in restricting the visibility of the data within the solution through the administrative tools and then ignoring this using the automation setup.
By default, all Apex operations (and Process Builder and certain Flows) run in System Mode; that is, they execute as a generic system user that has access to all metadata and data within the org. This means that although we may have sharing rules and permissions configured to limit access, our code can still act without limitations. For record sharing, this has both positive and negative consequences.
On the positive side, it means that our Apex code can retrieve data that the user cannot see to either provide more accurate values (for example, when running an aggregate query) or retrieve data we wish to utilize in our solution but not necessarily view...
