vritem/vridx/vrmsg

Provides access to the value (vritem) and index (vridx) when running a validation rule multiple times using the apply_to_each column.

These variables are only populated when the apply_to_each column is set, and are only accessible in the validation rule's hooks.

Read more about the apply_to_each column here.

Code in validation rules still has access to other special variables. If there is a naming conflict (e.g. vritem contains a field called payload) then the non-vritem value wins out.

vrmsg

vrmsg is a validation rule-specific variable that contains the error message from a failed a validation rule. This is commonly used in the fail_hook of a validation rule to send the message up the integration chain.