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Difference between Django's annotate and aggregate methods?
... Am I correct that .annotate() on a qs alone does not hit the db, but calling q[0].num_authors does? I assume aggregate must always hit the db as it is a terminal clause?
– alias51
Jul 30 at 23:05
...
Setting a WebRequest's body data
... throw new ApplicationException(string.Format(
"Remote server call {0} {1} resulted in a http error {2} {3}.",
method,
uri,
httpResponse.StatusCode,
httpResponse.StatusDescription), wex);
}
else
{
throw new ApplicationE...
Lua简明教程 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...表达式 a.b
__newindex(a, b, c) 对应表达式 a.b = c
__call(a, ...) 对应表达式 a(...)
“面向对象”
上面我们看到有__index这个重载，这个东西主要是重载了find key的操作。这操作可以让Lua变得有点面向对象的感觉，...
What are the differences between delegates and events?
...is that every class which uses your Animal class can raise RaiseEvent just calling it animal.RaiseEvent().
To avoid these weak spots you can use events in c#.
Your Animal class will change in this way:
public class ArgsSpecial : EventArgs
{
public ArgsSpecial (string val)
{
Operat...
Code equivalent to the 'let' keyword in chained LINQ extension method calls
...bout Code equivalent to the 'let' keyword in chained LINQ extension method calls
above comment is no more valid
var x = new List<int> { 2, 3, 4, 5, 6 }.AsQueryable();
(from val in x
let val1 = val
let val2 = val + 1
where val2 > val1
select val
).Dump();
produces
System.Collections.Ge...
How to determine one year from now in Javascript
... the next year if you do it in December; the date will be adjusted automatically. Same goes for day-of-month via getDate() and setDate().
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follow...
Check if two lists are equal [duplicate]
....Contains);. A simple count comparison is likely much faster than the .All call. If counts are not equal it would return faster.
– Spiralis
Aug 24 '15 at 4:21
8
...
How do you discover model attributes in Rails?
...
In ActiveRecord 5 (and probably earlier) you can call Model.attribute_names.
– aceofbassgreg
Sep 22 '16 at 17:17
add a comment
| ...
Why CancellationToken is separate from CancellationTokenSource?
...
@Mike -- Just curious: how come you can't call something like ThrowIfCancellationRequested() on a CTS like you can on a CT?
– rory.ap
Jun 16 '17 at 17:15
...
What is the difference between a shim and a polyfill?
...
A shim is any piece of code that performs interception of an API call and provides a layer of abstraction. It isn't necessarily restricted to a web application or HTML5/CSS3.
A polyfill is a type of shim that retrofits legacy browsers with modern HTML5/CSS3 features usually using Javascrip...