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Rails DB Migration - How To Drop a Table?
... table that I thought I was going to need, but now no longer plan on using it. How should I remove that table?
22 Answers
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View the change history of a file using Git versioning
How can I view the change history of an individual file in Git, complete details with what has changed?
24 Answers
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What is the difference between concurrency and parallelism?
...o or more tasks can start, run, and complete in overlapping time periods. It doesn't necessarily mean they'll ever both be running at the same instant. For example, multitasking on a single-core machine.
Parallelism is when tasks literally run at the same time, e.g., on a multicore processor.
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Are inline virtual functions really a non-sense?
... actual object
rather than a pointer or reference to
an object. I.e., either with a local
object, a global/static object, or a
fully contained object inside a
composite."
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What is the Ruby (spaceship) operator?
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Perl was likely the first language to use it. Groovy is another language that supports it. Basically instead of returning 1 (true) or 0 (false) depending on whether the arguments are equal or unequal, the spaceship operator will return 1, 0, or −1 depending on the ...
Cannot create an NSPersistentStoreCoordinator with a nil model
...and I'm getting the following error when running my code on my device, but it works fine on the simulator..
27 Answers
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browser sessionStorage. share between tabs?
I have some values in my site which I want to clear when the browser is closed. I chose sessionStorage to store those values. When tab is closed they are indeed cleared, and kept if the user presses f5; But if the user opens some link in a different tab these values are unavailable.
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What's the difference between echo, print, and print_r in PHP?
...play strings. The differences are subtle: print has a return value of 1 so it can be used in expressions whereas echo has a void return type; echo can take multiple parameters, although such usage is rare; echo is slightly faster than print. (Personally, I always use echo, never print.)
var_dump pr...
Is there a better way to run a command N times in bash?
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edited Nov 7 '18 at 18:52
Joshua Pinter
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File being used by another process after using File.Create()
I'm trying to detect if a file exists at runtime, if not, create it. However I'm getting this error when I try to write to it:
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