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Rails - Validate Presence Of Association?
... ActiveRecord::Base
has_one :profile
end
This way, Profile.create will now fail. I have to use user.create_profile or associate a user before saving a profile.
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R apply function with multiple parameters
I have a function f(var1, var2) in R. Suppose we set var2 = 1 and now I want to apply the function f() to the list L . Basically I want to get a new list L* with the outputs
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How to start an Intent by passing some parameters to it?
...e"
If your parameters are ints you would use getIntExtra() instead etc.
Now you can use your parameters like you normally would.
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How to change bower's default components folder?
...wer install
You should see bower_components folder in your public folder now
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PATH issue with pytest 'ImportError: No module named YadaYadaYada'
...ule path even if a module is in the same folder as the file run. I didn't know that this is considered best practice, so that's a useful bit of information, thanks. I agree with most of pep8, although it is still not perfect.
– Zelphir Kaltstahl
Nov 6 '16 at 19...
iOS Detection of Screenshot?
...ly break Snapchat entirely, so a couple betas in a new solution was added. Now, the solution is as simple as using NSNotificationCenter to add an observer to UIApplicationUserDidTakeScreenshotNotification.
Here's an example:
Objective C
NSOperationQueue *mainQueue = [NSOperationQueue mainQueue];
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Set selected index of an Android RadioGroup
...e RadioButtons are added to the radioGroup instead of the layout
}
}
Now Check a button using,
int radio_button_Id = radioGroup.getChildAt(index).getId();
radioGroup.check( radio_button_Id );
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MS-DOS Batch file pause with enter key
...
You can do it with the pause command, example:
dir
pause
echo Now about to end...
pause
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“Variable” variables in Javascript?
I know it's possible in PHP to have "variable" variables. For example
7 Answers
7
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Why use the INCLUDE clause when creating an index?
...ID, DepartmentID), once you find the employees for a given department, you now have to do "bookmark lookup" to get the actual full employee record, just to get the lastname column. That can get pretty expensive in terms of performance, if you find a lot of employees.
If you had included that lastna...