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I'm relative new to salesforce, and a want to know if it's a way to access to Activity Settings values from Apex code, as specified in Metadata API, I know it's not natively possible to call Metadata API from Apex, and I'm not interested in implementing some third party lib.
Is there another way to accomplish this? I want to access allowUsersToRelateMultipleContactsToTasksAndEvents setting without Metadata API.
For this particular setting, you can get it without touching the Metadata API:
Boolean isEnabled = Schema.getGlobalDescribe().containsKey('TaskWhoRelation'));
From the TaskWhoRelation documentation (emphasis mine):
TaskWhoRelation
Represents the relationship between a task and a lead or contacts. This object is available in API version 29.0 and later. This derived object is a filtered version of the TaskRelation object; that is, IsParent is true and IsWhat is false. It doesn’t represent relationships to accounts, opportunities, or other objects.
TaskWhoRelation allows a variable number of relationships: one lead or up to 50 contacts. Available only if you’ve enabled Shared Activities for your organization.
