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What is causing ERROR: there is no unique constraint matching given keys for referenced table?
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It's because the name column on the bar table does not have the UNIQUE constraint.
So imagine you have 2 rows on the bar table that contain the name 'ams' and you insert a row on baz with 'ams' on bar_fk, which row on bar would it be referring since there are two rows m...
How to hide command output in Bash
...on may be to...
Redirect output to /dev/null, which accepts all output and does nothing with it. It looks like this:
your_command "Hello?" > /dev/null
For output redirection to a file, you can direct both stdout and stderr to the same place very concisely, but only in bash:
/your/first/comman...
Fast way of finding lines in one file that are not in another?
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This does exactly what I need, in a tiny fraction of the time taken by the enormous grep. Thanks!
– Niels2000
Aug 13 '13 at 9:47
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Proper way to wait for one function to finish before continuing?
...This update is just to emphasise alternatives.
Also the original question doesn't specificallty mention async, so in case anyone is confused, if your function is synchronous, it will block when called. For example:
doSomething()
// the function below will wait until doSomething completes if it is ...
How to configure Sublime Text 2/3 to use direct Ctrl+Tab order and to create new tabs after the last
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Thanks. What about changing where does a new tab appear and where do I get when I close a tab?
– Ivan
Aug 29 '14 at 15:14
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What is the difference between a definition and a declaration?
...e something that's been declared and referenced somewhere, then the linker doesn't know what to link references to and complains about a missing symbols. If you define something more than once, then the linker doesn't know which of the definitions to link references to and complains about duplicated...
Is there a way to word-wrap long words in a div?
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Old post, but it doesn't appear to render spaces when IE is in quirks mode.
– Jeremy
Nov 21 '12 at 7:10
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How can I remove the gloss on a select element in Safari on Mac?
...> element with a background color generates a gloss over itself. This does not seem to happen in other operating systems.
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Bootstrap: Open Another Modal in Modal
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My solution does not close the lower modal, but truly stacks on top of it. It preserves scrolling behavior correctly. Tested in Bootstrap 3. For modals to stack as expected, you need to have them ordered in your Html markup from lowes...
setNeedsLayout vs. setNeedsUpdateConstraints and layoutIfNeeded vs updateConstraintsIfNeeded
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@pash3r Difference is updating constant doesn't qualify as "invalidation". Invalidation is when it's no longer relevant at all, like has to be attached to another view or removed completely. Constant would merely place a view closer or farther, or change its size, ...