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Changing data on change database schema in production is a common problem for Rails developers. Some day you decided to change the database schema and want to add some new column. Tests are working, new migration is working and everyone is happy.
Then you have to go through all your models and change actual data according this new schema. But what will be with this migration in one week when we run it on the production server?
Rails has useful approach to populate the database. This is great solution to populate the database by some data at first start but then, when your project is released and you have to change the data on changing the database schema this won’t help you.
Especially it’s true when the code is changing a lot.
At this point the best solution that I know is to just remove all the old migrations.
Of course you may create your own dependent files and then load them in the file but anyway you have to worry about what to do on second run. For example create rake tasks, of even going to production console and write code there after deploying (I hope you don’t do it).
There is also gem which helps to structuring you seeds data - seedbank. But none of them doesn’t solve all problems with the problem.
It takes time to process huge amount of data and the deployment process will be slowed down dramatically.
It will increase downtime of your application what is not acceptable for a production ready application with many real clients.
To define the time zone in Ruby on Rails application use the environment configuration file or create an initializer. Active Support uses the TZInfo gem so it can know about time zones.
This gem will load all this information from your operating system; in Ubuntu, this information comes from the Every time you persist an date attribute to the database, Active Record will convert it to UTC.
You need to consider time zones, understand how to store dates in your database, parse strings into dates or even format dates and display them to the user. In this article we’ll see how to use the utilities provided by Rails, so that your system can handle dates correctly.Tags: Adult Dating, affair dating, sex dating