database design - Disable delete permission for a user but allow read and update -

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how add few users particular role allowed read , update object not perform delete operation.

  • i have class a contains pointer class b.
  • class a has 2 roles -- admins , moderators.
  • class b has relation users class , adds above 2 roles acl.

now, how make sure, users match admin role criteria can whole crud op on relation in class b, moderators can add , read relation not delete users relation via relation.remove(user)


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