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POBackboneJS: How to cascade Model#destroy?
 

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  1. POBackboneJS: How to cascade Model#destroy?
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    <p>I have a relational DB (MySQL) at the backend and cool BackboneJS at the frontend. I have several tables (models in BackboneJS jargon) that are interconnected through foreign keys.</p> <p><strong>PROBLEM</strong></p> <p>How do I destroy a specific model, such that destruction cascades to all child models?</p> <p><strong>EXAMPLE</strong></p> <p>Consider this quick schema:</p> <pre><code>PERSON id name PHONE_NUMBER id person_id number EMAIL_ADDRESS id person_id email </code></pre> <p>Consider that we have a person "Jack" stored in DB with some phone numbers and email addresses. Also, we have BackboneJS models/collections defined for all of the 3 tables and data is loaded into them. A user on the frontend decides to delete records of Jack with a click.</p> <p>Now here are a few approaches to delete all records of Jack:</p> <p><strong>APPROACH#1</strong></p> <p>Call "destroy" on all models of PhoneNumbers and EmailAddresses related to Jack, then call "destroy" on Jack itself.</p> <p><strong>Problem(s)</strong> </p> <ul> <li>Too many AJAX calls for one action. </li> <li>User will have to wait for a lot of time. (More dependants, more time)</li> <li>Deletion will be non-transactional. If user closes the browser during, data will be corrupted.</li> </ul> <p><strong>APPROACH#2</strong></p> <p>Define foreign key relationships at database level, that ensure cascade deletion of PHONE_NUMBERs and EMAIL_ADDRESSes when a PERSON row is deleted. Then "destroy" BackboneJS model for Jack at frontend.</p> <ul> <li>BackboneJS Models for dependants will never know what happened to their corresponding records in the backend. So they'll remain intact.</li> </ul> <p><strong>APPROACH#3</strong></p> <p>Create a URL on server side application "/thoroughly-delete-person" (which makes sure to delete a person with all of its dependants) and invoke it from the frontend instead of calling BackboneJS's Model#destroy on Jack.</p> <ul> <li>Same problem as in Approach#2</li> </ul> <p>So seems like there is no perfect solution for this simple problem. Did you face it too? What approach did you take and why was it better?</p>
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