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What's the recommended approach to resetting migration history using Django South?
...tarting to consume quite a bit of time in my unit tests. I would like to reset the baseline and start a fresh set of migrations. I've reviewed the South documentation , done the usual Google/Stackoverflow searching (e.g. "django south (reset OR delete OR remove) migration history") and haven't foun...
How to create a unique index on a NULL column?
...
Strictly speaking, a unique nullable column (or set of columns) can be NULL (or a record of NULLs) only once, since having the same value (and this includes NULL) more than once obviously violates the unique constraint.
However, that doesn't mean the concept of "unique nu...
What is the difference between LL and LR parsing?
...hand, but they are less powerful than LR parsers and accept a much smaller set of grammars than LR parsers do. LR parsers come in many flavors (LR(0), SLR(1), LALR(1), LR(1), IELR(1), GLR(0), etc.) and are far more powerful. They also tend to have much more complex and are almost always generated ...
“R cannot be resolved to a variable”? [duplicate]
...r me somehow the Project properties; Android; Project Build Target was not set. I chose a Android version there (e.g. 4.2) and it fixed it.
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Changed GitHub password, no longer able to push back to the remote
...ook at the following Git documentation:-
https://help.github.com/articles/setting-your-username-in-git/
https://help.github.com/articles/changing-a-remote-s-url/
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How to write PNG image to string with the PIL?
...h doesn't exist in StringIO case
You can bypass the format detection by setting the format yourself in a parameter
import StringIO
output = StringIO.StringIO()
format = 'PNG' # or 'JPEG' or whatever you want
image.save(output, format)
contents = output.getvalue()
output.close()
...
jQuery access input hidden value
...at have a CSS display value of none, elements that have a width and height set to 0, and elements that have a hidden ancestor (api.jquery.com/hidden-selector)
– Daniel Liuzzi
Sep 14 '18 at 9:51
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How to use executables from a package installed locally in node_modules?
...use npm scripts since they always search the local binaries first. You can set up aliases to each of your binaries there or just use generic names like "build".
– Joe Zim
Sep 22 '15 at 1:47
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(How) can I count the items in an enum?
...{ FA, FB, FC, Folders_MAX = FC} versus {FA, FB, FC, Folders_MAX]: I prefer setting the ...MAX value to the last legal value of the enum for a few reasons:
The constant's name is technically more accurate (since Folders_MAX gives the maximum possible enum value).
Personally, I feel like Folders_MAX...
Simple explanation of clojure protocols
... in object oriented languages such as Java. A protocol defines an abstract set of functions that can be implemented in a concrete way for a given object.
An example:
(defprotocol my-protocol
(foo [x]))
Defines a protocol with one function called "foo" that acts on one parameter "x".
You can...