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Backwards migration with Django South
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You need to figure out the number of the migration just before the one you want to roll back.
Your app should have a migrations directory, with files in it named like
0000_initial.py
0001_added_some_fields.py
0002_added_some_more_fields.py
0003_deleted_some_stuff.py
Normally, wh...
jquery-ui sortable | How to get it work on iPad/touchdevices?
...ng to prevent elements from moving until they've touched that specific one for X seconds should do the trick?
– Tom
Oct 31 '13 at 23:18
2
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What is javax.inject.Named annotation supposed to be used for?
... not clear what the javax.inject.Named annotation is supposed to be used for. The Javadoc does not explain the the idea behind it.
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UIPopovercontroller dealloc reached while popover is still visible
I assure you that I did look for an answer in SO for my question but none of them were helpful. Here I got a simple code that should present a UIImagePickerController within a UIPopoverController :
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Prevent line-break of span element
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Put this in your CSS:
white-space:nowrap;
Get more information here: http://www.w3.org/wiki/CSS/Properties/white-space
white-space
The white-space property declares how white space inside the element is handled.
Values
normal
This value directs user agents to collapse seque...
How to change value of process.env.PORT in node.js?
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For just one run (from the unix shell prompt):
$ PORT=1234 node app.js
More permanently:
$ export PORT=1234
$ node app.js
In Windows:
set PORT=1234
In Windows PowerShell:
$env:PORT = 1234
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What does an Asterisk (*) do in a CSS selector?
...d, this means it will select all elements within that portion of the DOM.
For example, if I want apply margin to every element on my entire page you can use:
* {
margin: 10px;
}
You can also use this within sub-selections, for example the following would add a margin to all elements within a...
How to get a substring of text?
... This may be obvious to some, but it is not okay to use a comma for negative positions: a[-4,-2]. The only valid notation is the two dots: a[-4..-2]. Learnt it the hard way.
– cavpollo
Jul 1 '15 at 6:59
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How to check if an intent can be handled from some activity?
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edwardxu's solution works perfectly for me.
Just to clarify a bit:
PackageManager packageManager = getActivity().getPackageManager();
if (intent.resolveActivity(packageManager) != null) {
startActivity(intent);
} else {
Log.d(TAG, "No Intent available...
python numpy machine epsilon
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An easier way to get the machine epsilon for a given float type is to use np.finfo():
print(np.finfo(float).eps)
# 2.22044604925e-16
print(np.finfo(np.float32).eps)
# 1.19209e-07
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