大约有 40,000 项符合查询结果（耗时：0.0478秒） [XML]
Select distinct values from a table field
...ctually that works. However! I couldn't get it to work on all my models. Weidly, it worked on some but not others. For those that have a Meta ordering it doesn't work. So, you have to clear the ordering on the queryset first. models.Shop.objects.order_by().values('city').distinct()
...
Get the current first responder without using a private API
...eturn the first responder.
@implementation UIView (FindFirstResponder)
- (id)findFirstResponder
{
if (self.isFirstResponder) {
return self;
}
for (UIView *subView in self.subviews) {
id responder = [subView findFirstResponder];
if (responder) return respo...
Having both a Created and Last Updated timestamp columns in MySQL 4.0
... the more interesting question would be WHY THE HECK DON'T they've not provided a way do this very commonly requested/needed functionality.
– Ray
Aug 2 '12 at 17:20
22
...
Automapper - how to map to constructor parameters instead of property setters
...TestFixture]
public class Tester
{
[Test]
public void Test_ConstructUsing()
{
Mapper.CreateMap<ObjectFrom, ObjectTo>()
.ConstructUsing(x => new ObjectTo(x.Name));
var from = new ObjectFrom { Name = "Jon", Age = 25 };
...
How do I test if a string is empty in Objective-C?
...
You can check if [string length] == 0. This will check if it's a valid but empty string (@"") as well as if it's nil, since calling length on nil will also return 0.
share
|
improve this answ...
TypeScript: problems with type system
...ave a problem with its type system. My html site has a canvas tag with the id "mycanvas". I'm trying to draw a rectangle on this canvas. Here's the code
...
Good examples of Not a Functor/Functor/Applicative/Monad?
...r, but not Applicative:
I don't have a good example. There is Const, but ideally I'd like a concrete non-Monoid and I can't think of any. All types are basically numeric, enumerations, products, sums, or functions when you get down to it. You can see below pigworker and I disagreeing about wheth...
Query an XDocument for elements by name at any depth
... example:
using System;
using System.Xml.Linq;
class Test
{
static void Main()
{
string xml = @"
<root>
<child id='1'/>
<child id='2'>
<grandchild id='3' />
<grandchild id='4' />
</child>
</root>";
XDocument doc = XDoc...
How to have an automatic timestamp in SQLite?
...
Just declare a default value for a field:
CREATE TABLE MyTable(
ID INTEGER PRIMARY KEY,
Name TEXT,
Other STUFF,
Timestamp DATETIME DEFAULT CURRENT_TIMESTAMP
);
However, if your INSERT command explicitly sets this field to NULL, it will be set to NULL.
...
how to draw smooth curve through N points using javascript HTML5 canvas?
...by completely disjoint control points. One solution is to "curve to" the midpoints between the next 2 subsequent sample points. Joining the curves using these new interpolated points gives a smooth transition at the end points (what is an end point for one iteration becomes a control point for the...