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Smart Functions

Before you begin this section, you should have completed all of the basic lessons, or have a good understanding of Fluree schema and adding data.

Role of Smart Functions#

Smart functions are the engine for setting permissions in Fluree.

Every time a transaction is issued, that transaction might trigger various smart functions. In addition, when an end user (not a node) issues a query, various smart functions might be triggered.

Smart functions will either return true or false. If every smart function that is triggered returns true, then the transaction will go through. If even one triggered smart function returns false, then the transaction will fail, or in the case of a query- that piece of information will not be displayed to the user.

Smart functions are stored in the _fn collection. From the _fn collection, smart functions can be referenced in a variety of places. Functions stored in different locations are triggered in slightly different ways.