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116 lines
4.2 KiB
116 lines
4.2 KiB
11 months ago
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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta http-equiv="X-UA-Compatible" content="IE=edge">
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<meta http-equiv="content-type" content="text/html; charset=utf-8">
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<!-- Enable responsiveness on mobile devices-->
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<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1, viewport-fit=cover">
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<title>Julio Biason .Me 4.3</title>
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<!-- CSS -->
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<link rel="stylesheet" href="https://blog.juliobiason.me/print.css" media="print">
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<link rel="stylesheet" href="https://blog.juliobiason.me/poole.css">
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<link rel="stylesheet" href="https://blog.juliobiason.me/hyde.css">
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<link rel="stylesheet" href="https://fonts.googleapis.com/css?family=PT+Sans:400,400italic,700|Abril+Fatface">
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</head>
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<body class=" ">
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<div class="sidebar">
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<div class="container sidebar-sticky">
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<div class="sidebar-about">
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<a href="https://blog.juliobiason.me"><h1>Julio Biason .Me 4.3</h1></a>
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<p class="lead">Old school dev living in a 2.0 dev world</p>
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</div>
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<ul class="sidebar-nav">
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<li class="sidebar-nav-item"><a href="/">English</a></li>
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<li class="sidebar-nav-item"><a href="/pt">Português</a></li>
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<li class="sidebar-nav-item"><a href="/tags">Tags (EN)</a></li>
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<li class="sidebar-nav-item"><a href="/pt/tags">Tags (PT)</a></li>
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</ul>
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</div>
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</div>
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<div class="content container">
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<div class="post">
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<h1 class="post-title">Things I Learnt The Hard Way - One Version To Add, One Version To Remove</h1>
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<span class="post-date">
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2019-07-30
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<a href="https://blog.juliobiason.me/tags/books/">#books</a>
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<a href="https://blog.juliobiason.me/tags/things-i-learnt/">#things i learnt</a>
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<a href="https://blog.juliobiason.me/tags/versions/">#versions</a>
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<a href="https://blog.juliobiason.me/tags/upgrades/">#upgrades</a>
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</span>
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<p>A lot of things change during development. One day you need a field, another
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day that field may be completely different. For those cases, use one version
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to add the new field and another to remove.</p>
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<span id="continue-reading"></span>
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<p>You have a database with a lot of customers and their ID is numerical. But for
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some reason, they now need to be strings. Instead of changing the field type
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and doing a whole migration, make a deploy with a new field, in which you'll
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keep the old <em>and</em> the new format going on and, in the next release, remove
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the old field. No downtime. You can even run the migration while the system is
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up, since the new field won't be used.</p>
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<p>(I'm simplifying the problem a lot here, 'cause the customer would have
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references all around your system, but you get the point, right?)</p>
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<p>I had a problem in which we store the link for an object directly in the
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backend (we shouldn't, that's a frontend problem, but that's a discussion for
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another time); our interface is changing and so should the link. If we did a
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change in the link directly, that would mean the backend would have to be
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deployed <em>at the same time</em> as the new interface; by adding the new link
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format in another field, we can deploy the backend easily without breaking the
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current system.</p>
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<div>
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<div style="float:left">
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<< <a href="/books/things-i-learnt/transparent">Be Transparent With The User</a>
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</div>
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<div style="float:right">
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<a href="/books/things-i-learnt/monitoring">Learn To Monitor</a> >>
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</div>
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</div>
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</div>
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</div>
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</body>
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</html>
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