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Determine what attributes were changed in Rails after_save callback?
... Works great! Also to be noted, the result of self.changed is an array of strings! (Not symbols!) ["attr_name", "other_attr_name"]
– LukeS
Mar 2 '17 at 23:18
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Visibility of global variables in imported modules
...l = None
if 'MYVAL' in os.environ:
myval = os.environ['MYVAL']
As an extra precaution, handle the case when MYVAL is not defined inside the module.
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UITableViewHeaderFooterView: Unable to change background color
...es not generate any warning message. Apple code does not have 'background' string at all. Of course, uitableVuewHeaderFooterview.contentView is nil in TVAnimationsGestures. I don't understand why this happen.
– kmugitani
Feb 6 '15 at 5:54
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Adding iOS UITableView HeaderView (not section header)
...o do that, you need to be able to calculate the height of the cell given a string, and pass that value in for heightForRowAtIndexPath. You can use NSString's method sizeWithFont:constrainedToSize: function to figure out the height of the text when constrained to a size.
– Mark
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Captured variable in a loop in C#
...r or foreach:
for (int i=0; i < 10; i++) // Just one variable
foreach (string x in foo) // And again, despite how it reads out loud
See section 7.14.4.2 of the C# 3.0 spec for more details of this, and my article on closures has more examples too.
Note that as of the C# 5 compiler and beyond ...
How do I fix “Failed to sync vcpu reg” error?
... installed. It is not. You must go to this folder:
<Android SDK>\extras\intel\Hardware_Accelerated_Execution_Manager\
and run intelhaxm-android.exe manually. In my case, I had 1.0.6 and upgraded to 1.1.
I think that what caused the error in the first place was that some other part of th...
Does free(ptr) where ptr is NULL corrupt memory?
...L Perq running PNX, which was based on Version 7 Unix with some System III extras). But I've not code that way for a long time.
– Jonathan Leffler
Mar 11 '10 at 14:06
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Get difference between two lists
...ot[4]'],
'values_changed': {'root[2]': {'newvalue': 4, 'oldvalue': 2}}}
String difference
>>> t1 = {1:1, 2:2, 3:3, 4:{"a":
How to get the path of the batch script in Windows?
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Extra information is "d means the drive only, …" etc. Thank you, @Hayz.
– R.J. Dunnill
Aug 6 '19 at 22:00
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Get the name of the currently executing method
...ns a symbol – for example, :test_method. To return the method name as a string, call __method__.to_s instead.
Note: This requires Ruby 1.8.7.
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