[LRUG] Deployment approach to rolling out huge changes

[Ed James (Alt)]

As per your questions…  

1) No, unfortunately we can't run both together. We did look at this option but we all agreed that it's just not feasible (7 devs agreed unanimously). We all agree that doing this will introduce too much complexity into the code.

2) Interesting idea, but again, this will probably introduce too much complexity.

The changes to the code, while far-reaching, are not actually that difficult. It's mainly moving a whole bunch of logic from one model into another, and then changing the various relationships between models. So the coding is mainly refactoring, rather than coding brand new functionality. But the models we're changing are the central models in our system, hence my original post.

Thanks.

--  
Ed James (Spam)
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On Monday, 10 September 2012 at 09:21, Chris Parsons wrote:

>  
> On 10 Sep 2012, at 09:04, "Ed James (Alt)" <ed.james.spam at gmail.com (mailto:ed.james.spam at gmail.com)> wrote:
> > Unfortunately the feature in question involves a fundamental change to our system, one which affects almost every part of the codebase in that it changes a key relationship between our models. Because it also changes the way we charge users it's not something that can be easily "phased in" to our production environment (we are not changing our prices, but rather how we allocate the charges).
> Just picking up on this, with a few options:
>  
> 1) is there any way you can run both relationships together? For example, can you have both code paths running for different people, with a feature flag to test the new way the code is being used?
>  
> 2) can you make the old code write to the database in the new way using a translation layer, and then phase in the new code selectively by serving a new copy of your app to a few users?
>  
> HTH
> Chris
>  
> --
> Chris Parsons
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> http://pa.rsons.org
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