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Select DISTINCT individual columns in django?
...distinct(). The above example will work but all combinations of distinct() and values() may not.
PS: it is a good idea to use lower case names for fields in a model. In your case this would mean rewriting your model as shown below:
class ProductOrder(models.Model):
product = models.CharField...
How to call a Python function from Node.js
...all you have to do is make sure that you import sys in your python script, and then you can access arg1 using sys.argv[1], arg2 using sys.argv[2], and so on.
To send data back to node just do the following in the python script:
print(dataToSendBack)
sys.stdout.flush()
And then node can liste...
Do event handlers stop garbage collection from occurring?
...that this is one-way; i.e. if we have:
publisher.SomeEvent += target.SomeHandler;
then "publisher" will keep "target" alive, but "target" will not keep "publisher" alive.
So no: if pClass is going to be collected anyway, there is no need to unsubscribe the listeners. However, if pClass was long-...
Best way to merge two maps and sum the values of same key?
I want to merge them, and sum the values of same keys. So the result will be:
15 Answers
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Recommended way to save uploaded files in a servlet application
...ot save the file in the server anyway as it is not portable, transactional and requires external parameters. However, given that I need a tmp solution for tomcat (7) and that I have (relative) control over the server machine I want to know :
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Pelican 3.3 pelican-quickstart error “ValueError: unknown locale: UTF-8”
...ile:
export LC_ALL=en_US.UTF-8
export LANG=en_US.UTF-8
There is an outstanding bug report related to this issue. It appears that Python makes some assumptions about the format of locale names that aren't universally valid. Explicitly setting these environment vars is basically just a workaround...
How do you get a Golang program to print the line number of the error it just called?
...his to work I only need to set that at the top of one of the package files and it will available for all my files for that package?
– Pinocchio
Jul 17 '14 at 18:31
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Best way to detect Mac OS X or Windows computers with JavaScript or jQuery
...m trying to move a "close" button to the left side when the user is on Mac and the right side when the user is on PC. Now I'm doing it by examining the user agent, but it can be too easily spoofed for reliable OS detection. Is there a surefire way to detect whether the OS on which the browser is run...
Spring: how do I inject an HttpServletRequest into a request-scoped bean?
... The problem is that when you test validators using MockMvc and this kind of injection you'll have problems. May be the other solution will be preferred in this case
– Neyko
Feb 25 '13 at 14:55
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Bogus foreign key constraint fail
...US" after the drop fails.
If it turns out to be the latter case, I'd dump and restore the whole server if you can.
MySQL 5.1 and above will give you the name of the table with the FK in the error message.
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