function readOnly(count){ }
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There are few ways of achieving this requirement:
- Using Trigger : You can go through the sample trigger for help. (https://developer.salesforce.com/forums/?id=906F0000000AcdaIAC)
- Using Flows & Process Builder : (https://www.xgeek.net/salesforce/create-roll-up-summary-field-to-count-contacts-on-account-with-process-builder-and-flows/)
Let me know if it answers your question.Regards,
Rabi