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How to define object in array in Mongoose schema correctly with 2d geo index
...itization.
(req, res, next) => {
// Extract the validation errors from a request.
const errors = validationResult(req);
if (!errors.isEmpty()) {
// There are errors. Render form again with sanitized values/error messages.
res.status(400).send({...
What exactly does an #if 0 … #endif block do?
...y:
/*
foo();
bar(x, y); /* x must not be NULL */
baz();
*/
Bzzt. Syntax error! Why? Because block comments do not nest, and so (as you can see from SO's syntax highlighting) the */ after the word "NULL" terminates the comment, making the baz call not commented out, and the */ after baz a syntax e...
How can I pass a member function where a free function is expected?
...e preferable than using a void* interface as they remove the potential for errors due to a cast to the wrong type.
To clarify how to use a function pointer to call a member function, here is an example:
// the function using the function pointers:
void somefunction(void (*fptr)(void*, int, int), v...
Smarty中date_format日期格式化详解 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...围从 001 到 366）
%k - 小时，24 小时格式，没有前导零
%l - 小时，12 小时格式，没有前导零
%m - 十进制月份（范围从 01 到 12）
%M - 十进制分钟数
%n - 换行符
%p - 根据给定的时间值为 `am' 或 `pm'，或者当前区域设置中的相应字符...
How would you count occurrences of a string (actually a char) within a string?
...
LukeHLukeH
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Python ElementTree module: How to ignore the namespace of XML files to locate matching element when
...elated code outside the with block. I ended up creating this after getting errors in unrelated libraries after using the version by ericspod which also happened to use expat.
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What key shortcuts are to comment and uncomment code?
There were Ctrl + E + C (comment) and Ctrl + E + U (uncomment) in older versions, or Ctrl + K + C and Ctrl + K + U .
...
iOS 7's blurred overlay effect using CSS?
...e demo no longer works. The content goes below the phone, and I get the JS error "TypeError: sheet.addRule is not a function"
– BoffinBrain
Apr 29 '15 at 10:10
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What is “the inverse side of the association” in a bidirectional JPA OneToMany/ManyToOne association
...write many queries, for example when you try to debug something)
it's more error prone because you can suddenly get too many or too few results when something goes wrong in the code which manages the connection table.
That's why I rarely recommend this approach.
...
Basic http file downloading and saving to disk in python?
...
For Python3+ URLopener is deprecated.
And when used you will get error as below:
url_opener = urllib.URLopener() AttributeError: module 'urllib' has no
attribute 'URLopener'
So, try:
import urllib.request
urllib.request.urlretrieve(url, filename)
...