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I would like to understand the difference between protected and public visibility on custom settings.

I know a managed package custom setting is protected and cannot be accessed everywhere from the https://help.salesforce.com/HTViewHelpDoc?id=cs_define.htm&language=en_US, but I'm trying to understand any use case for that.

What happens if I create a custom settings and use protected vs private? Does it allow me to restrict access for users based on visibility or restricts accessing from apex or formulas?

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There's no difference between public and protected custom settings in an unmanaged package scenario. Anyone with Customize Application can modify the values of the custom settings.

For a managed package, protected completely hides the values from the subscriber. This includes Apex Code, validation rules, workflow rules, flows, Visualforce pages, triggers, custom buttons and links, and any other place you might be able to access custom settings normally.

The usual case for using protected custom settings is to provide a data store that administrators cannot modify. Passwords, encryption keys, license settings, and other things that you simply do not want to allow administrators to modify should be placed in protected custom settings. This includes settings that can be "messed up" if not modified in a controlled manner.

Public custom settings allow administrators to view and modify values, as well as allow them to create code that can manipulate those values. Use public custom settings for things like "user preferences" or other non-sensitive data that isn't vital to your application's operation.

  • Thank you @sfdcfox, understood the difference with great explanation. – Anurag A Jul 7 '16 at 16:10
  • @sfdcfox Does that mean the users will not have access to this custom setting through the managed apex code as well? – Vignesh Aug 10 '16 at 7:12
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    @Vignesh no, managed code can access the settings. The purpose is to provide controlled access to the settings. – sfdcfox Aug 10 '16 at 7:14
  • @sfdcfox, one more quick question. Does the custom settings need the FLS CRUD check suggested by checkmarx? Or can we mark it false positive? – Vignesh Aug 10 '16 at 7:33
  • @Vignesh it is most definitely a false positive. You can do whatever you want with your own data. – sfdcfox Aug 10 '16 at 7:36

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