In this scenario you have a custom entity called Training Course which has a N:N relationship with the Contact entity. You need to implement a business rule (rollup) that will keep track of the count of Contacts that are associated to a training course. In effect count (rollup) the number of Attendees on to the Training entity.
N52 Formula Manager Solution
The Formula Manager solution works like this,
- We create a formula that can hook into the Associate & Disassociate events within Dynamics CRM. So it executes whenever a many to many relationship gets created or removed.
- As the association events are generic we need to check for the schema name of the N:N relationship between the 2 entities
- If the schema name matches then we update the field 'new_totalattendees' on the training course entity
- This is calculated by finding the total number of contacts associated with training course
N52 Formula Manager Steps
The following set of steps assumes you have an entity called Training Course already created with a N:N relationship between it & the contact entity
- Create a new formula of type 'N:N Associate'
- Set the Source Entity to 'Training Course'
- Copy & paste the formula below into the formula description field & click save
- You are ready to test
if(GetAssociationRelationshipName() = 'new_trainingcourse_contact', UpdateRecord('new_trainingcourse', [new_trainingcourse.new_trainingcourseid], SetAttribute('new_totalattendees', FindCount('new_trainingcourse_contact', 'new_trainingcourseid', [new_trainingcourse.new_trainingcourseid], 'new_trainingcourseid','0'))), 'NoOp')
Wizard - FindCount()
Note 1: You will need to setup the exact same formula but set the Formula Type to N:N Disassociate if you need to handle contacts being removed from the many to many relationship