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What is the difference between t.belongs_to and t.references in rails?
... for help, clarification, or responding to other answers.Making statements based on opinion; back them up with references or personal experience.To learn more, see our tips on writing great answers.
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How do I parse an ISO 8601-formatted date?
... and are okay to tolerate occasional misreads.
– ivan_pozdeev
Apr 23 '15 at 23:34
2
Agreed. An ex...
App Inventor 2 向心力实验App - 探究向心力F与角速度ω、半径r、质量m的关...
...a
初始化局部变量 m = 取文本为数字(文本输入框_质量.文本)
初始化局部变量 r = 取文本为数字(文本输入框_半径.文本)
设置 全局变量 向心力 为 m × 全局变量 向心加速度
设置 标...
Check to see if python script is running
... pid file, the script will be run multiple times.
I suggest the following based from another website:
This is to check if there is already a lock file existing
\#/usr/bin/env python
import os
import sys
if os.access(os.path.expanduser("~/.lockfile.vestibular.lock"), os.F_OK):
#if the loc...
Transposing a 2D-array in JavaScript
...
array[0].map((_, colIndex) => array.map(row => row[colIndex]));
map calls a provided callback function once for each element in an array, in order, and constructs a new array from the results. callback is invoked only for indexe...
Changing the status bar text color in splash screen iOS 7
...usBarStyleLightContent instead.
And you don't have to set UIViewControllerBasedStatusBarAppearanceto NOin your plist, you can set the preferredStatusBarStyle you want to your view controllers.
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What is the Difference Between Mercurial and Git?
...
64
So "natively" is not quite the right word, but it is not well supported under windows, that is for sure.
– Ian Kellin...
How to know if two arrays have the same values
...
function arraysEqual(_arr1, _arr2) {
if (!Array.isArray(_arr1) || ! Array.isArray(_arr2) || _arr1.length !== _arr2.length)
return false;
var arr1 = _arr1.concat().sort();
var arr2 = _arr2.concat().sort();
for (var i = 0; ...
Implement touch using Python?
...is will create a file.txt at the path.
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Path.touch(mode=0o777, exist_ok=True)
Create a file at this given path. If mode is given, it is combined with the process’ umask value to determine the file mode and access flags. If the file already exists, the function succeeds if exist_ok is t...
Where is the C auto keyword used?
...rking enforcement.
If you see a lot of extern static auto ... in any code base, you're in a bad neighborhood; look for a better job immediately, before the whole place turns to Rust.
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improv...