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Postgresql: Conditionally unique constraint
... It's also worth noting that this index effects can't be deferred. If you need to perform bulk updates this may present a problem as the uniqueness is checked after every row, not after the statement like it would be for a constraint or after the transaction like it would be for a deferrable...
Ruby on Rails: How can I revert a migration with rake db:migrate?
...> is the version number of your migration file you want to revert.
eg. if you want to revert a migration with file name 3846656238_create_users.rb
rake db:migrate:down VERSION=3846656238
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Delete ActionLink with confirm dialog
...
Poor implementation. Don't modify the server data on GET
– Dan Hunex
Apr 15 '13 at 19:12
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Dynamically add script tag with src that may include document.write
...rl + ' was loaded (' + --count + ' more scripts remaining).');
if (count < 1) {
callback();
}
};
}
function loadScript(url) {
var s = document.createElement('script');
s.setAttribute('src', url);
s.onload = urlCallba...
How to do Mercurial's 'hg remove' for all missing files?
...
If you intend to do addremove and commit, it can be joined with '-A' option as shown here:
hg commit -A -m 'Commit with addremove'
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PowerMockito mock single static method and return object
...on the mock instance.
From the javadoc:
Creates class mock with a specified strategy for its answers to
interactions. It's quite advanced feature and typically you don't need
it to write decent tests. However it can be helpful when working with
legacy systems. It is the default answer so ...
How to get RGB values from UIColor?
...
If someone finding problem on how to get values from colors, you can write something like, CGFloat red = colors[0];
– Hemang
Jul 2 '14 at 9:49
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Regular expression for matching HH:MM time format
..." part in the string is valid. I resolved the issue by using the following if statement let res = value.match(regex); if (res && res[0] === value) doSomething();
– Taha Rehman Siddiqui
Oct 7 '19 at 17:55
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Percentage width child element in absolutely positioned parent on Internet Explorer 7
...ioned div its parent has a width of 0 hence why it itself collapses to 0.
If you would like a more in-depth discussion of this along with lots of working examples, have a gander here.
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Undefined reference to pthread_create in Linux
...ects on command line, and -lpthread is not an "option", it's a library specification. On a system with only libpthread.a installed,
gcc -lpthread ...
will fail to link.
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