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Rails params explained?
...en params[:foo] would be "1" and params[:boo] would be "octopus".
In HTTP/HTML, the params are really just a series of key-value pairs where the key and the value are strings, but Ruby on Rails has a special syntax for making the params be a hash with hashes inside. For example, if the user's brow...
Logical operator in a handlebars.js {{#if}} conditional
...
Note that this wasn't possible until HTMLBars in Ember 1.10. Also, those helpers come as an Ember CLI addon if you'd rather: github.com/jmurphyau/ember-truth-helpers.
– stephen.hanson
Jul 31 '15 at 15:06
...
What is declarative programming? [closed]
...
Here's an example.
In CSS (used to style HTML pages), if you want an image element to be 100 pixels high and 100 pixels wide, you simply "declare" that that's what you want as follows:
#myImageId {
height: 100px;
width: 100px;
}
You can consider CSS a declarative...
Drawing an image from a data URL to a canvas
...e:
var img = new Image;
img.src = strDataURI;
The drawImage() method of HTML5 Canvas Context lets you copy all or a portion of an image (or canvas, or video) onto a canvas.
You might use it like so:
var myCanvas = document.getElementById('my_canvas_id');
var ctx = myCanvas.getContext('2d');
var...
How can I configure Logback to log different levels for a logger to different destinations?
...
You can also use logback.qos.ch/manual/filters.html#levelFilter which will implement the classes for you..
– Dejell
Nov 6 '11 at 6:47
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Rails: FATAL - Peer authentication failed for user (PG::Error)
...he user before it will GRANT ALL: postgresql.org/docs/8.2/static/sql-grant.html
– Bent Cardan
May 12 '12 at 19:55
38
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node and Error: EMFILE, too many open files
...evlog/2014/1/11/how-to-determine-whats-causing-error-connect-emfile-nodejs.html
How To Isolate
This command will output the number of open handles for nodejs processes:
lsof -i -n -P | grep nodejs
COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
...
nodejs 12211 root 1012u IP...
How can javascript upload a blob?
...(e) { ... };
xhr.send(file);
Granted, if you are replacing a traditional HTML multipart form with an "AJAX" implementation (that is, your back-end consumes multipart form data), you want to use the FormData object as described in another answer.
Source: New Tricks in XMLHttpRequest2 | HTML5 Rocks...
ASP MVC href to a controller/view
... that you can accomplish this. You can do the following:
<li>
@Html.ActionLink("Clients", "Index", "User", new { @class = "elements" }, null)
</li>
or this:
<li>
<a href="@Url.Action("Index", "Users")" class="elements">
<span>Clients</span>...
JOIN queries vs multiple queries
...
Source: https://dev.mysql.com/doc/refman/8.0/en/nested-join-optimization.html ; https://dev.mysql.com/doc/workbench/en/wb-relationship-tools.html
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