Problem: I want to grant or revoke access to certain content on a single post and user basis. Is this possible using Toolset?
Solution: Partially it is natively possible using Access, but for example, to allow or disallow access to single fields by posts by users, you'll need some custom code.
The core idea of this code is explained here: https://toolset.com/forums/topic/grant-revoke-access-to-image-visibility-based-on-user/page/2/#post-1489243
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