大约有 33,000 项符合查询结果（耗时：0.0511秒） [XML]
Rails: select unique values from a column
...el.uniq.pluck(:rating)
# rails 5+
Model.distinct.pluck(:rating)
Update
Apparently, as of rails 5.0.0.1, it works only on "top level" queries, like above. Doesn't work on collection proxies ("has_many" relations, for example).
Address.distinct.pluck(:city) # => ['Moscow']
user.addresses.disti...
Random color generator
...r creating easily distinguishable vibrant markers in Google Maps and other apps.
// Adam Cole, 2011-Sept-14
// HSV to RBG adapted from: http://mjijackson.com/2008/02/rgb-to-hsl-and-rgb-to-hsv-color-model-conversion-algorithms-in-javascript
var r, g, b;
var h = step / numOfSteps;
...
How to activate virtualenv?
... the flask project directory and under microblog directory there should be app and venv folders. then run the below command, This is one worked for me in Ubuntu.
source venv/bin/activate
share
|
...
Disable cross domain web security in Firefox
... Works for me! I allowed CORS for localhost and now I can test my web apps and APIs locally without setting up complicated servers. Thank you!
– Arthur Khazbs
Jun 8 at 14:46
...
PostgreSQL query to list all table names?
...iving just \dt in psql? See https://www.postgresql.org/docs/current/static/app-psql.html.
share
|
improve this answer
|
follow
|
...
Git 'fatal: Unable to write new index file'
...
It happened to me that the file .git/index was in use by another process (my local development web server). I shut down the process and then it worked.
s...
How can I enable auto complete support in Notepad++?
...
Auto complete documentation is now here: sourceforge.net/apps/mediawiki/notepad-plus/…
– Sam Mackrill
Oct 24 '11 at 16:11
...
Rails 4 multiple image or file upload using carrierwave
...g create instead just fails silently. Any idea how to have the validation happen on the post reach into the attachments?
– dchess
Jul 26 '16 at 23:51
|
...
How to use underscore.js as a template engine?
...id="target"></div>
<!-- Write some code to fetch the data and apply template -->
<script type="text/javascript">
var items = [
{name:"Alexander", interests:"creating large empires"},
{name:"Edward", interests:"ha.ckers.org <\nBGSOUND SRC=\"javascript:alert('XSS');...
ASP.NET Web Site or ASP.NET Web Application?
... start a new ASP.NET project in Visual Studio, I can create an ASP.NET Web Application or I can create an ASP.NET Web Site.
...