#migration

There are very few certainties in app development, but one is that once your app is released it will change in unexpected ways. And no matter how flexible your architecture it is inevitably one of those changes will be a breaking change. Perhaps the most important breaking changes involve the user's data. If your app loses or corrupts user data you can expect at least some reputational damage and if the loss is severe enough you can end up doing your competitors marketing for them by turning your users into…

This post is now out-of-date, please instead see: "Progressive Core Data Migration". People really care about their possessions. Nowhere do you see this more than on public transport. It's not unusual to see bags occupying seats while people stand. As a Brit, we have developed a powerful non-verbal based form of communication to indicate that you want someone to move their bag - maybe a slight shuffle, eye contact with other standing commuters and tutting. Even with these clear signs some people…