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POHow to save an object when you do not know if its parent objects exist or not?
 

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  1. POHow to save an object when you do not know if its parent objects exist or not?
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    <p>I have three tables,</p> <pre><code>Business: id name Office: id name business_id Employee: id name office_id </code></pre> <p>Employee's have office_id as a foreign key and Offices have business_id as a foreign key.</p> <p>I have a domain object/entity that relates to each and a database mapper object that relates to each.</p> <p>Now how to insert a new Employee when I am provided by a Business name, Office name and Employee name?</p> <p>Initially I figure the logic should be something like:</p> <pre><code>$businessMapper = new businessMapper(); $business = $businessMapper-&gt;findBusinessByName($business_name); if ($business == false) { $business = new businessEntity(array( 'businessName' =&gt; $business_name, )); $businessMapper-&gt;save($business); } $officeMapper = new officeMapper(); $office = $officeMapper-&gt;getOfficeByName($office_name, $business); .......etc....... </code></pre> <p>But then I realised that if I have to save a new business there is no way that I have an office or an employee so it is a wasted query to try to get them. So then I thought I should create an if/else stucture.</p> <pre><code>get business entity by business_name if ($business == false) { create business entity save business entity create office entity save office entity create employee entity save employee entity } else { get office entity by office_name + business_id if (office == false) { create office entity save office entity create employee entity save employee entity } else { ......etc...... } } </code></pre> <p>But there is so much duplicated logic and it is very unscaleable/dirty.</p> <p>So how should it be achieved?</p> <p>And secondly where should the logic go? Should it go in the mapper of employee? or the controller for the 'Add employee' action or should it have a new model?</p> <p>I am using Zend as my framework, but I think the question applies to all MVC style structures so please feel free to respond regardless of your framework preference :)</p>
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    1. COIt's a good question, but I don't believe it has anything to do with MVC. Also, it's more about data mappers than anything else. It's really nice to actually see a question where someone isn't hammering their app into some god-awful ORM anti-pattern. So +1 for that.
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    2. COAdded datamapper tag :)
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