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OO Design in Rails: Where to put stuff
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Because Rails provides structure in terms of MVC, it's natural to end up using only the model, view, and controller containers that are provided for you. The typical idiom for beginners (and even some intermediate programmers) is to cram all l...
How are virtual functions and vtable implemented?
...hen a virtual function is called on an object, the vptr of that object provides the base address of the virtual table for that class in memory. This table is used to resolve the function call as it contains the addresses of all the virtual functions of that class. This is how dynamic binding is reso...
Where are the PostgreSQL logs on macOS?
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Postgresapp 9.3.5.1 and later keep a server log. The log is inside the data directory, named postgres-server.log.
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How to insert element as a first child?
...s.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<div id="parent-div">
<div>Hello World</div>
</div>
<input type="button" value="add" class="add" />
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Altering column size in SQL Server
...u can cause a crash (on my environment anyway).
– DavidTheDev
Jan 30 '15 at 15:36
57
It's also im...
微博为什么限制140字(附短信70字限制考) - 闲聊区 - 清泛IT社区，为创新赋能！
...更新状态的字数限制，本身是160字母的限制，再留20字给id长度，剩余140字母留给用户发挥。此外，YAHOO!的meme（2,000字）和Google的Buzz（没有限制）等对字数都没有短而精的要求，在这个层面上，算不上微博，只能算轻量级博客，...
Remove scrollbar from iframe
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in your css:
iframe{
overflow:hidden;
}
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Django dynamic model fields
...tegrates with Django admin;
At the same time being really powerful.
Downsides:
Not very efficient. This is more of a criticism of the EAV pattern itself, which requires manually merging the data from a column format to a set of key-value pairs in the model.
Harder to maintain. Maintaining data...
How do I remove newlines from a text file?
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This didn't work on Mac OS, Sundeep's version did. paste -sd'\0' -
– Trenton
Sep 23 '19 at 17:31
add a com...
Center a 'div' in the middle of the screen, even when the page is scrolled up or down?
...my page a button which when clicked displays a div (popup style) in the middle of my screen.
5 Answers
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