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Validate uniqueness of multiple columns
Is there a rails-way way to validate that an actual record is unique and not just a column? For example, a friendship model / table should not be able to have multiple identical records like:
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How to link to a named anchor in Multimarkdown?
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In standard Markdown, place an anchor <a name="abcd"></a> where you want to link to and refer to it on the same page by [link text](#abcd).
(This uses name= and not id=, for reasons explained in this answer.)
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What are the details of “Objective-C Literals” mentioned in the Xcode 4.4 release notes?
I was going through the release notes for Xcode 4.4 and noticed this:
3 Answers
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When to use next() and return next() in Node.js
...eturn next();
// do something
});
It saves me an indentation level, and when I read the code again later, I'm sure there is no way next is called twice.
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When to use Comparable and Comparator
...thought I wrote a new class that implements Comparator, that does the task and it works.
19 Answers
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使用App Inventor扩展实现多点触控：Rotation Detector · App Inventor 2 中文网
...tents
rver.
Keep in mind that the extensions mechanism is still unstable and under development. Any aia files you build in steps (1) a
Using App Inventor extensions to implement multitouch: Rotation detector
A demo app with rotation detector extension component
How to build rotation detector...
使用App Inventor扩展实现多点触控：Rotation Detector · App Inventor 2 中文网
...tents
rver.
Keep in mind that the extensions mechanism is still unstable and under development. Any aia files you build in steps (1) a
Using App Inventor extensions to implement multitouch: Rotation detector
A demo app with rotation detector extension component
How to build rotation detector...
使用App Inventor扩展实现多点触控：Rotation Detector · App Inventor 2 中文网
...tents
rver.
Keep in mind that the extensions mechanism is still unstable and under development. Any aia files you build in steps (1) a
Using App Inventor extensions to implement multitouch: Rotation detector
A demo app with rotation detector extension component
How to build rotation detector...
使用App Inventor扩展实现多点触控：Rotation Detector · App Inventor 2 中文网
...tents
rver.
Keep in mind that the extensions mechanism is still unstable and under development. Any aia files you build in steps (1) a
Using App Inventor extensions to implement multitouch: Rotation detector
A demo app with rotation detector extension component
How to build rotation detector...
Using -performSelector: vs. just calling the method
I'm still kind of new to Objective-C and I'm wondering what is the difference between the following two statements?
5 Answe...