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How does Rails keep track of which migrations have run for a database?
...hen Rails runs a migration, it takes the leading digits in the migration's file name and inserts a row for that "version", indicating it has been run. If you roll back that migration, Rails will delete the corresponding row from schema_migrations.
For example, running a migration file named 2012062...
How to call a JavaScript function from PHP?
... There's off course also the option of linking in an external javascript file that does the call itself... That way you keep JavaScript where it belongs, in the JavaScript code. =)
– PatrikAkerstrand
Jun 25 '09 at 19:54
...
Changing default encoding of Python?
...ultencoding function is removed from sys.
So the solution is to append to file /usr/lib/python2.7/sitecustomize.py the code:
import sys
sys.setdefaultencoding('UTF8')
When I use virtualenvwrapper the file I edit is ~/.virtualenvs/venv-name/lib/python2.7/sitecustomize.py.
And when I use with pyt...
How to center text vertically with a large font-awesome icon?
...g
<div class='my-fancy-container'>
<span class='my-icon icon-file-text'></span>
<span class='my-text'>Hello World</span>
</div>
.my-icon {
vertical-align: middle;
font-size: 40px;
}
.my-text {
font-family: "Courier-new";
}
.my-fancy-contai...
Error during installing HAXM, VT-X not working
...ort emulator in rendering graphics more smoothly. I downloaded appropriate file HAXM file for Windows 7 64 bit, unpacked and started installing. However, during the installation process I get this error:
...
Reset push notification settings for app
... This would only work if your'e using wildcard based provisioning profiles - otherwise, you would need to create a profile for the new bundle.
– Zorayr
May 18 '15 at 2:03
...
Xcode 6 Storyboard the wrong size?
...steps to resolve the issue
In Storyboard, select any view, then go to the File inspector. Uncheck the "Use Size Classes", you will ask to keep size class data for: iPhone/iPad. And then Click the "Disable Size Classes" button.
Doing this will make the storyboard's view size with selected device.
...
What are the differences between a clustered and a non-clustered index?
...er. Create a logical order for data rows and use pointers to physical data files
Data insertion/update is faster than clustered index
Use extra space to store logical structure
Apart from these differences you have to know that when table is non-clustered (when the table doesn't have a clustered...
What is lazy loading in Hibernate?
...e Parent Object.
You need to do this setting respective hibernate mapping file of the parent class.
Lazy = true (means not to load child)
By default the lazy loading of the child objects is true.
This make sure that the child objects are not loaded unless they are explicitly invoked in the appl...
How can I debug my JavaScript code? [closed]
...ng Firebug since I discovered it, and it helps me a lot! console.debug, profiler, inspector...
– Julio Greff
Jun 12 '09 at 20:23
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