MIXED_DML_OPERATION error in Salesforce
You can easily run into this error if you are
trying to perform DML on setup and non-setup objects in the same transaction.
Non-Setup objects are standard objects like Account or any custom object.
Setup objects are Group, GroupMember, UserTerritory, Territory, etc.
For example, you cannot insert an account and then insert a user or a group
member in a single transaction.
Test methods allow for performing mixed DML operations between the sObjects
listed earlier and other sObjects if the code that performs the DML operations
is enclosed within System.runAs method
blocks. This enables you, for example, to create a user with a role and other sObjects in the same test.
Non-Setup objects are standard objects like Account or any custom object.
Setup objects are Group, GroupMember, UserTerritory, Territory, etc.
For example, you cannot insert an account and then insert a user or a group member in a single transaction.
Test methods allow for performing mixed DML operations between the sObjects listed earlier and other sObjects if the code that performs the DML operations is enclosed within System.runAs method blocks. This enables you, for example, to create a user with a role and other sObjects in the same test.
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