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Fully custom validation error message with Rails
Using Rails I'm trying to get an error message like "The song field can't be empty" on save. Doing the following:
17 Answer...
Polymorphism: Why use “List list = new ArrayList” instead of “ArrayList list = new ArrayList”? [dupl
...he main reason you'd do this is to decouple your code from a specific implementation of the interface. When you write your code like this:
List list = new ArrayList();
the rest of your code only knows that data is of type List, which is preferable because it allows you to switch between differe...
What is the naming convention in Python for variable and function names?
Coming from a C# background the naming convention for variables and method names are usually either camelCase or PascalCase:
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How to Sort a List by a property in the object
... note that this creates a whole new list with all the items in memory, which may be problematic in terms of performance.
– staafl
Oct 19 '13 at 19:25
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Programmatically obtain the phone number of the Android phone
...gr.getLine1Number();
Required Permission:
<uses-permission android:name="android.permission.READ_PHONE_STATE"/>
Caveats:
According to the highly upvoted comments, there are a few caveats to be aware of. This can return null or "" or even "???????", and it can return a stale phone number...
Are std::vector elements guaranteed to be contiguous?
My question is simple: are std::vector elements guaranteed to be contiguous? In order word, can I use the pointer to the first element of a std::vector as a C-array?
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How do you default a new class to public when creating it in Visual Studio?
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Achieving bright, vivid colors for an iOS 7 translucent UINavigationBar
...ers. I'm subclassing UINavigationBar and adding a layer to the back with some extra space to cover if any of the various height status bars are up. The layer gets adjusted in layout subviews and the color changes whenever you set barTintColor.
Gist: https://gist.github.com/aprato/6631390
setBarTi...
bash/fish command to print absolute path to a file
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Use realpath
$ realpath example.txt
/home/username/example.txt
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urlencode vs rawurlencode?
...en/function.rawurlencode.php)
Returns a string in which all non-alphanumeric characters except -_.~ have been replaced with a percent (%) sign followed by two hex digits. This is the encoding described in » RFC 3986 for protecting literal characters from being interpreted as special URL delimit...