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Ruby on Rails: How do I add a not null constraint to an existing column using a migration?
In my Rails (3.2) app, I have a bunch of tables in my database but I forgot to add a few not null constraints. I've googled around but I can't find how to write a migration which adds not null to an existing column.
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What are the differences between a UIView and a CALayer?
...ed before Core Animation existed, UIViews are intended to be lightweight wrappers around these CALayers.
As I describe in the similar question "When to use CALayer on the Mac/iPhone?", working directly with CALayers doesn't give you significant performance advantages over UIViews. One of the reaso...
When should assertions stay in production code? [closed]
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Actually, the worst thing that happens is when code crashes due to something that is NOT an assert. If the code will definitely crash later on with 100% probability, then the assert must absolutely be there. If you deref a pointer, then you have to implic...
Start an Activity with a parameter
...GAME_ID, gameId))
Get the Id in SecondActivity:
class CaptureActivity : AppCompatActivity() {
companion object {
const val PARAM_GAME_ID = "PARAM_GAME_ID"
}
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
val gameId = ...
Labels for radio buttons in rails form
My question is similar to this one
but for a Rails app.
5 Answers
5
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Removing duplicates from a list of lists
...omment, normal optimization efforts are focused on large inputs (the big-O approach) because it's so much easier that it offers good returns on efforts. But sometimes (essentially for "tragically crucial bottlenecks" in deep inner loops of code that's pushing the boundaries of performance limits) on...
How can I position my div at the bottom of its container?
... your container breaks your design, remember that you can just include a wrapper div inside of the container with 100% height, and add position:relative to that instead.
– Jack Shepherd
Aug 17 '11 at 17:16
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Unescape HTML entities in Javascript?
...n jsFiddle (view in IE). The version above works with all inputs.
UPDATE: appears this doesn't work with large string, and it also introduces a security vulnerability, see comments.
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New to unit testing, how to write great tests? [closed]
...nit testing world, and I just decided to add test coverage for my existing app this week.
7 Answers
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How to bind to a PasswordBox in MVVM
...wer implies that the password string is never in memory if you follow this approach. The value of the password will be in memory from the moment the user types it. Eliminating the property holding your passphrase is a good idea and will limit the copies of your password that get left laying aroun...