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Rails hidden field undefined method 'merge' error
I wanna do something like this in rails
6 Answers
6
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pandas GroupBy columns with NaN (missing) values
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This is mentioned in the Missing Data section of the docs:
NA groups in GroupBy are automatically excluded. This behavior is consistent with R, for example.
One workaround is to use a placeholder before doing the groupby (e.g. -1):
In [11]: df.fillna(-1)
Out[11]:
a b
0 ...
Why are we not to throw these exceptions?
...ly unspecific. You shouldn’t ever throw this exception because it simply does not contain any useful information. Calling code catching for exceptions couldn’t disambiguate the intentionally thrown exception (from your logic) from other system exceptions that are entirely undesired and point out...
How to change MySQL data directory?
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Stop MySQL using the following command:
sudo /etc/init.d/mysql stop
Copy the existing data directory (default located in /var/lib/mysql) using the following command:
sudo cp -R -p /var/lib/mysql /newpath
edit the MySQL configuration file with the following command...
Checking if a variable is not nil and not zero in ruby
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@xiy currently the guide recommends pretending or and and don't exist (|| is that or && and?)
– user3125280
Aug 24 '14 at 15:33
69
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Bash script to cd to directory with spaces in pathname
... run. However, the path to that directory has spaces in it. How the heck do you do this? This is what I have...
13 Answe...
Which “href” value should I use for JavaScript links, “#” or “javascript:void(0)”?
...to some using the return value of the function called like this:
function doSomething() {
//Some code
return false;
}
But then they forget to use return doSomething() in the onclick and just use doSomething().
A second reason for avoiding # is that the final return false; will not execut...
Completion handler for UINavigationController “pushViewController:animated”?
...igationController?.pushViewController(vc, animated: true) {
// Animation done
}
Objective-C
Header:
#import <UIKit/UIKit.h>
@interface UINavigationController (CompletionHandler)
- (void)completionhandler_pushViewController:(UIViewController *)viewController
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jQuery get textarea text
...ble to make a 'console' on my webpage (as in, you press the ` key like you do in FPS games, etc.), and then have it Ajax itself back to the server in-order to do stuff.
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Prevent Bootstrap Modal from disappearing when clicking outside or pressing escape? [duplicate]
I'm using the Twitter Bootstrap modal as a wizard window, and would like to prevent the user from closing it when clicking outside of the modal or when pressing escape. Instead, I want it to be closed when the user presses the finish button. How could I achieve this scenario?
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