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ActiveRecord: size vs count
...o go if you are using the data.
Example: Summary of a fully loaded table, titles of displayed data, etc.
size
It checks if the data was loaded (i.e. already in rails) if so, then just count it, otherwise it calls count. (plus the pitfalls, already mentioned in other entries).
def size
loaded? ...
How to Add a Dotted Underline Beneath HTML Text
...you can do:
<html>
<head>
<!-- Other head stuff here, like title or meta -->
<style type="text/css">
u {
border-bottom: 1px dotted #000;
text-decoration: none;
}
</style>
</head>
<!-- Body, content here -->
</html>
...
Actual meaning of 'shell=True' in subprocess
...ll are nontrivial, you now require the reader and maintainer of the Python script (which may or may not be your future self) to understand both Python and shell script. Remember the Python motto "explicit is better than implicit"; even when the Python code is going to be somewhat more complex than t...
Convert an image to grayscale in HTML/CSS
...
Update: I made this into a full GitHub repo, including JavaScript polyfill for IE10 and IE11: https://github.com/karlhorky/gray
I originally used SalmanPK's answer, but then created the variation below to eliminate the extra HTTP request required for the SVG file. The inline SVG wor...
micro:bit 实验05 - 用 P0 引脚读一个自己接的按钮 · App Inventor 2 中文网
... function HideORDispFeedback() { $("#feedback").toggle();}function makeTitleDraggable(element, titleElement) { let isDragging = false; let offsetX, offsetY; // 只在标题栏上按下时开始拖动 titleElement.onmousedown = function(e) { isDragging = true; offset...
Modifying a query string without reloading the page
... a photo gallery, and would like to be able to change the query string and title when the photos are browsed.
5 Answers
...
How to turn on line numbers in IDLE?
...top (Win10) like this:
C:\Python\Python37\pythonw.exe "C:\Python\Python37\Scripts\idlex.pyw"
The paths may be different and need to be changed:
C:\Python\Python37
(Thanks for the great answers above)
share
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...
How do I pull my project from github?
...ion. This will open up the SSH key page. Click on the New SSH key. In the "Title" field, add a descriptive label for the new key. Paste your key into the "Key" field.
Clone the Repository
Open VS Code (or any IDE/CLI which has command prompt etc.). Go to the directory in which you want to clone, us...
List all svn:externals recursively?
...
I used the answer of Wim Coenen and wrote the following script to create a list of all revisions:
getSvnRevs() {
cd "$1"
wcver="$(svnversion)"
[ -n "$wcver" ] || panic "Unable to get version for $wcdir"
echo "$1: $wcver"
svn propget svn:externals -R | while read a b c d...
JavaScript - onClick to get the ID of the clicked button
...tton id="3" onClick="reply_click(this.id)">B3</button>
<script type="text/javascript">
function reply_click(clicked_id)
{
alert(clicked_id);
}
</script>
This will send the ID this.id as clicked_id which you can use in your function. See it in actio...