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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
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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，...
Can I find out the return value before returning while debugging in Eclipse?
...er the line has been run and before the instruction pointer returns to the calling function?
9 Answers
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How to check a radio button with jQuery?
...se:
$("#radio_1").attr('checked', 'checked');
Tip: You may also want to call click() or change() on the radio button afterwards. See comments for more info.
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jQuery get specific option tag text
...is nickf. Here is this answer expanded if you want to get the value dynamically: var selectValue = document.getElementById('list').value; var selectOption = $("#list option[value=" + selectValue + "]").text(); ///good example nickf.
– Kevin Florida
Apr 5 '11...
In C# what is the difference between a destructor and a Finalize method in a class?
... do so. Manually overriding Finalize will give you an error message.
Basically what you are trying to do with your Finalize method declaration is hiding the method of the base class. It will cause the compiler to issue a warning which can be silenced using the new modifier (if it was going to work...
The performance impact of using instanceof in Java
...= _.class implementation
I used jmh to run the benchmark with 100 warmup calls, 1000 iterations under measuring, and with 10 forks. So each option was measured with 10 000 times, which takes 12:18:57 to run the whole benchmark on my MacBook Pro with macOS 10.12.4 and Java 1.8. The benchmark measur...
How do you discover model attributes in Rails?
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In ActiveRecord 5 (and probably earlier) you can call Model.attribute_names.
– aceofbassgreg
Sep 22 '16 at 17:17
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How do I pass parameters into a PHP script through a webpage?
I am calling a PHP script whenever a webpage loads. However, there is a parameter that the PHP script needs to run (which I normally pass through the command line when I am testing the script).
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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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