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Rails migration for change column
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You can also use a block if you have multiple columns to change within a table.
Example:
change_table :table_name do |t|
t.change :column_name, :column_type, {options}
end
See the API documentation on the Table class for more details.
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How can I test what my readme.md file will look like before committing to github?
...ts "definition lists", github doesn't. StackEdit puts triple backtick code blocks on there own line (useful for use in numbered lists), github doesn't. There are other differences. The only safe bet is to trial and error with a gist and delete it when you are done.
– Bruno Bron...
MediaHelper 媒体助手扩展：从媒体文件提取元数据和专辑封面 · App Inventor 2 中文网
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格式：0 = PNG，1 = JPEG
显示到图像组件 ToImageBlock(图像组件)
在 Image 组件中显示专辑图像。
事件 Events
元数据加载后 AfterLoadMetaData(成功)
当 LoadMetaDataAsync 完成后触发此事件。
Success：...
In what cases will HTTP_REFERER be empty
... the HTTP_REFERER, because HTTP_REFERER = NULL
has some browser addon that blocks it for privacy reasons. Some firewalls and AVs do to.
Try this firefox extension, you'll be able to set any headers you want:
@Master of Celebration:
Firefox:
extensions: refspoof, refontrol, modify headers, no-r...
how to release localhost from Error: listen EADDRINUSE
...nd prompt (cmd). With the cmd you can discover the process ID (PID) of the blocking application. You will need the PID in order to terminate / kill the process.
Here is a step-by-step guide...
Find all processes which are running on a specified port (in this example, Port is "3000"):
netstat ...
ViewPager.setOffscreenPageLimit(0) doesn't work as expected
...s, after added this code I got NPL for first time, I just added try catch block and its works perfect for me!!!
– Bhavin Chauhan
Aug 26 '15 at 4:56
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Twitter bootstrap remote modal shows same content every time
...ass on the modal, so if your window was too small, the modal may have been blocking mouse events on the buttons. For some reason JSFiddle.net is really bad this morning (got a 504 trying to update), so I just redid the example on plnkr.co, which is better for AJAX anyway.
– me...
How to check Google Play services version?
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}
and you have two options, either write your code directly in else block as commented, or use the returned boolean value for this method to write custom code.
I hope this code helps someone.
share
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数据结构与本地数据库 04：从打包 JSON 读取知识卡片 · App Inventor 2 中文网
...g:hover { color: #3773f5 } .feedback-pop .feedback-img { display: inline-block; width: 24px; height: 24px; margin-bottom: 4px; background: url(/static/images/feedback.svg) 50% / 100% auto no-repeat; } /*手机版：反馈浮动按钮收小*/ @media screen and (max-width: 700px) { .feedback-po...
How to replace DOM element in place using Javascript?
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this example wouldn't work. You should put the script block at the end of the body to make it work. Furthermore, just for fun: try adding the line [alert(myAnchor.innerHTML)] after the operation.
– KooiInc
May 10 '09 at 8:27
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