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As a developer, i was required to build a custom solution to calculate and display the number of contacts for each account, which functions similarly to a rollup summary field. * this trigger is designed to update the number_of_contacts__c field on the account object * whenever a contact record is inserted, updated, deleted, or undeleted. There is a free tool for declarative rollup summaried between non md relationships created by andrew.
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Is there anyway to update a rollup summary field with lookup relation ship for a custom object. It is a rigorous, well documented package that allows you to declaratively create rollup summaries for lookup relationships. In this blog, we will learn how to create a rollup summary trigger for a lookup relationship using apex triggers.
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How can we achieve this using triggers ?
The trigger should work whenever a contact’s salary is updated, new. On each account, the total salary field should hold the sum of salaries from its associated contacts. Rollup summaries are only available when a m:d relationship exists. Currently you are not setting the right value for total_amount__c since you're adding to the current total_amount__c the one of the contacts in trigger scope.
And then need to update. Whenever contact is inserted (after insert event), you need to query all the contacts associated with the accountid field of the inserted contact.
