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Django admin: how to sort by one of the custom list_display fields that has no database field
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I haven't tested this out (I'd be interested to know if it works) but what about defining a custom manager for Customer which includes the number of orders aggregated, and then setting admin_order_field to that aggregate, ie
from django.db import models
class CustomerManage...
Refresh a page using PHP
How can I refresh a page using PHP periodically? If I can not do it by PHP, what is the best recommended scenario?
13 Answe...
How to do an instanceof check with Scala(Test)
...; replacing all JUnit tests with ScalaTests. At one point, I want to check if Guice's Injector injects the correct type. In Java, I have a test like this:
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Select mySQL based only on month and year
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If you have
$_POST['period'] = "2012-02";
First, find the first day of the month:
$first_day = $_POST['period'] . "-01"
Then this query will use an index on Date if you have one:
$q = "
SELECT *
FROM project...
Rails :include vs. :joins
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.joins will just joins the tables and brings selected fields in return. if you call associations on joins query result, it will fire database queries again
:includes will eager load the included associations and add them in memory. :includes loads all the included tables attributes. If you call ...
What's onCreate(Bundle savedInstanceState)
Can anyone help me to know about the Bundle savedInstanceState in onCreate(Bundle savedInstanceState) I am newbie in Android. I try to understand it from developer.android.com. But I am not able to understand. Can anyone simplify it?
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Embedding SVG into ReactJS
...ort, check the docs’ list of supported SVG attributes. And here’s the (now closed) GitHub issue that tracked support for namespaced SVG attributes.
Previous answer
You can do a simple SVG embed without having to use dangerouslySetInnerHTML by just stripping the namespace attributes. For exam...
Change R default library path using .libPaths in Rprofile.site fails to work
...getenv())) ]
The two that matter for storing and accessing packages are (now different on a Linux box):
R_LIBS_SITE /usr/local/lib/R/site-library:/usr/lib/R/site-library:/usr/lib/R/library
R_LIBS_USER /home/david/R/x86_64-pc-linux-gnu-library/3.5....
How to send a header using a HTTP request through a curl call?
...lly do. You should not replace internally set headers without
knowing perfectly well what you're doing. Remove an internal header
by giving a replacement without content on the right side of the
colon, as in: -H "Host:".
curl will make sure that each...
How to identify server IP address in PHP
How can I identify the server IP address in PHP?
15 Answers
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