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Rails migrations: Undo default setting for a column

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When to use -retainCount?

...cation, an object's retainCount is meaningless. If you're trying to track down why an object isn't getting deallocated, use the Leaks tool in Instruments. If you're trying to track down why an object was deallocated too soon, use the Zombies tool in Instruments. But don't use -retainCount. It's ...
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Call a REST API in PHP

... the Web site: $client = new GuzzleHttp\Client(); $res = $client->get('https://api.github.com/user', [ 'auth' => ['user', 'pass'] ]); echo $res->getStatusCode(); // 200 echo $res->getHeader('content-type'); // 'application/json; charset=utf8' echo $res->getBody(); ...
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Checking for empty queryset in Django

... use cases (those where there are results), this technique often gets that down to under 20ms. (One case I found, it was 6.) Could be much longer, of course, depending on how far the database has to look to find a result. Or even faster, if it finds one quickly; YMMV. EDIT: This will often be slow...
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Slow Requests on Local Flask Server

...tall gevent. Instructions on how to modify your code accordingly are here: https://flask.palletsprojects.com/en/1.1.x/deploying/wsgi-standalone/#gevent meinheld gevent is better, but from all the benchmarks I've looked at that involve real-world testing, meinheld seems to be the most straightforward...
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How can I add a class attribute to an HTML element generated by MVC's HTML Helpers?

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CSS vertical alignment of inline/inline-block elements

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Error “The connection to adb is down, and a severe error has occurred.”

... [2012-07-04 11:24:25 - The connection to adb is down, and a severe error has occurred. [2012-07-04 11:24:25 - You must restart adb and Eclipse. [2012-07-04 11:24:25 - Please ensure that adb is correctly located at '/home/ASDK/platform-tools/adb' and can be executed ...
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Why is transposing a matrix of 512x512 much slower than transposing a matrix of 513x513?

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The definitive guide to form-based website authentication [closed]

...und practical auth, and how to avoid the most common security pitfalls. To HTTPS or not to HTTPS? Unless the connection is already secure (that is, tunneled through HTTPS using SSL/TLS), your login form values will be sent in cleartext, which allows anyone eavesdropping on the line between browser a...