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SQL to determine minimum sequential days of access?
...ionDate < DATEADD(dd, DATEDIFF(dd, 0, uh1.CreationDate) + @days, 0), to mean "Not yet on the 31st day later". Also means you can skip the @seconds calculation.
– Rob Farley
Jan 22 '10 at 1:09
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Rails 4 multiple image or file upload using carrierwave
...s way you simply do not need to have a child object's controller at all! I mean no any PostAttachmentsController is needed anymore. As for parent object's controller (PostController), you also almost don't change it - the only thing you change in there is the list of the whitelisted params (to inclu...
What is a “first chance exception”?
... It's more than a debugging concept; C# doesn't provide a convenient means of observing two-pass exception handling at run-time, but vb.net does. Basically, when an exception is thrown, the run-time starts by searching up the call stack to find out who if anyone is going to catch it. That pr...
How to run functions in parallel?
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@Lamar McAdory: Please explain what exactly you mean by "at the same time", perhaps giving a concrete example of what you did, what you were expecting to happen, and what actually happened.
– NPE
Aug 26 '11 at 16:30
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Django Rest Framework File Upload
...difference between the POST and PUT requests is reflected in the different meaning of the Request-URI. The URI in a POST request identifies the resource that will handle the enclosed entity. That resource might be a data-accepting process, a gateway to some other protocol, or a separate entity that ...
function declaration isn't a prototype
... number of arguments, while int foo(void) accepts 0 arguments. In C++ they mean the same thing. I suggest that you use void consistently when you mean no arguments.
If you have a variable a, extern int a; is a way to tell the compiler that a is a symbol that might be present in a different translat...
How are Python's Built In Dictionaries Implemented?
...e key.
If that slot is empty, the entry is added to the slot (by entry, I mean, <hash|key|value>). But what if that slot is occupied!? Most likely because another entry has the same hash (hash collision!)
If the slot is occupied, CPython (and even PyPy) compares the hash AND the key (by comp...
How can I trigger a JavaScript event click
...t);
}
};
Note that calling fireEvent(inputField, 'change'); does not mean it will actually change the input field. The typical use case for firing a change event is when you set a field programmatically and you want event handlers to be called since calling input.value="Something" won't trigge...
What is an uninterruptible process?
...function) that cannot be interrupted by a signal.
To understand what that means, you need to understand the concept of an interruptible system call. The classic example is read(). This is a system call that can take a long time (seconds) since it can potentially involve spinning up a hard drive, or...
Difference between freeze and seal
...ays looks these up in MDN. In short:
Freeze: makes the object immutable, meaning no change to defined property allowed, unless they are objects.
Seal: prevent addition of properties, however defined properties still can be changed.
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