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In Django, how does one filter a QuerySet with dynamic field lookups?
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Just a quick gotcha heads-up: make sure the strings in the kwargs are of type str not unicode, else filter() will grumble.
– Steve Jalim
Apr 4 '11 at 9:30
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How do I “git blame” a deleted line?
...w the contents of the line, this is an ideal use case for:
git log -S <string> path/to/file
which shows you commits which introduce or remove an instance of that string. There's also the -G<regex> which does the same thing with regular expressions! See man git-log and search for the -...
Is Hash Rocket deprecated?
...use the rocket if you use keys in your Hashes that aren't symbols, such as strings, integers or constants. For example, 's' => x is valid but 's': x is something completely different.
You can kludge around the above in the obvious manner of course:
h = { }
h[:'where.is'] = 'pancakes house?'
# e...
What are the disadvantages to declaring Scala case classes?
...ically defined
Possible in any class by prefixing params with val
Decent toString() implementation
Yes, very useful, but doable by hand on any class if necessary
Compliant equals() and hashCode()
Combined with easy pattern-matching, this is the main reason that people use case classes
Companion obje...
Is there documentation for the Rails column types?
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Guidelines built from personal experience:
String:
Limited to 255 characters (depending on DBMS)
Use for short text fields (names, emails, etc)
Text:
Unlimited length (depending on DBMS)
Use for comments, blog posts, etc. General rule of thumb: if it's captured v...
How do you get the index of the current iteration of a foreach loop?
... }
}
public class Example
{
public static void Main()
{
string[] values = new[] { "foo", "bar", "baz" };
values.ForEachWithIndex((item, idx) => Console.WriteLine("{0}: {1}", idx, item));
}
}
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Jackson how to transform JsonNode to ArrayNode without casting?
...xample:
JSON:
{
"objects" : ["One", "Two", "Three"]
}
Code:
final String json = "{\"objects\" : [\"One\", \"Two\", \"Three\"]}";
final JsonNode arrNode = new ObjectMapper().readTree(json).get("objects");
if (arrNode.isArray()) {
for (final JsonNode objNode : arrNode) {
System.o...
Spring 3 MVC accessing HttpRequest from controller
...s anything: @RequestMapping(value="/") public String home(HttpServletRequest request){ System.out.println(""+request.getSession().getCreationTime()); return "home"; } This should pring the current amount pof millis but it does not, also annotating the ...
How to put a unicode character in XAML?
...y inside Text="...". When using a Binding with my ViewModel I had to use a string variable containing "\u2014".
– flocbit
Aug 7 '18 at 9:10
add a comment
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HttpServletRequest - how to obtain the referring URL?
...lable in the HTTP referer header. You can get it in a servlet as follows:
String referrer = request.getHeader("referer"); // Yes, with the legendary misspelling.
You, however, need to realize that this is a client-controlled value and can thus be spoofed to something entirely different or even re...