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WITH SECURITY_ENFORCED - Spring '19

Use the WITH SECURITY_ENFORCED clause to enable checking for field- and object-level security permissions on SOQL SELECTqueries, including subqueries and cross-object relationships. Although performing these checks was possible in earlier releases, this clause substantially reduces the verbosity and technical complexity in query operations. This feature is tailored to Apex developers who have minimal development experience with security and to applications where graceful degradation on permissions errors isn’t required.

 To use, just add the WITH SECURITY_ENFORCED clause in SOQL SELECT queries. If there are any fields or objects referenced in the SELECT clause that are inaccessible to the user, an exception is thrown and no data is returned.
If field-level security for either the LastName or Description field is hidden, this query throws an exception indicating insufficient permissions.
SELECT Id, (SELECT LastName FROM Contacts),
   (SELECT Description FROM Opportunities)
   FROM Account WITH SECURITY_ENFORCED

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