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How to change a nullable column to not nullable in a Rails migration?
I created a date column in a previous migration and set it to be nullable. Now I want to change it to be not nullable. How do I go about doing this assuming there are null rows in that database? I'm ok with setting those columns to Time.now if they're currently null.
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How do I run a shell script without using “sh” or “bash” commands?
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Hey thanks for your reply. I tried that out. Now I can run it without the "sh" command. But I still have to prefix the command with "./" which I don't want to. :)
– Rameez Hussain
Jan 8 '12 at 18:26
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How do you remove an invalid remote branch reference from Git?
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You might be needing a cleanup:
git gc --prune=now
or you might be needing a prune:
git remote prune public
prune
Deletes all stale tracking branches under <name>. These stale branches have already been removed from the remote repository referenced by &...
Is there a shortcut to make a block comment in Xcode?
... parameters}
return "/*\n" & (input as string) & "*/"
end run
Now you can access that service through Xcode - Services menu, or by right clicking on the selected block of code you wish to comment, or giving it a shortcut under System Preferences.
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Generate a random point within a circle (uniformly)
...gle we just fold any points that appear in ADC back down to ABC along AC.
Now consider a circle. In the limit we can think of it as infinitely many isoceles triangles ABC with B at the origin and A and C on the circumference vanishingly close to each other. We can pick one of these triangles simply...
Creating the Singleton design pattern in PHP5
...ngleton would produce an instance of its parent class instead of its own.
Now you can do:
class Foobar extends Singleton {};
$foo = Foobar::getInstance();
And $foo will be an instance of Foobar instead of an instance of Singleton.
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How can I get seconds since epoch in Javascript?
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Re: arcane magic: Per these docs, Javascript knows how to convert a Date object to a Number. This means that you can type Number(new Date()) to get a number, or even +(new Date()), or use any Date instance in a numerical context such as new Date()/1000 and Javascript wi...
Is it possible to make a Tree View with Angular?
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Have a look at this fiddle
Original: http://jsfiddle.net/brendanowen/uXbn6/8/
Updated: http://jsfiddle.net/animaxf/uXbn6/4779/
This should give you a good idea of how to display a tree like structure using angular. It is kind of using recursion in html!
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Java: Get month Integer from Date
... that Calendar.MONTH is for no apparent reasons ZERO based, ie January==0. Now that's documented just fine in the API, but it's still confusing as hell for first time users. I've yet to find anyone who could tell me why they went with that - maybe time for a new SO question myself (though I fear the...
Create a pointer to two-dimensional array
...0][0][1] = ...;
Because indexing requires the element type's size to be known (indexing implies an addition of an integer to the pointer, so it won't work with incomplete types). Note that this only works in C, because T[] and T[N] are compatible types. C++ does not have a concept of compatible ty...