大约有 40,000 项符合查询结果（耗时：0.0587秒） [XML]
find() with nil when there are no records
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Yes, just do:
Challenge.find_by_id(10)
For Rails 4 and 5:
Challenge.find_by(id: 10)
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Do you put unit tests in same project or another project?
... can be toggled using compiler command-line parameters in your CI software scripts. See msdn.microsoft.com/en-us/library/4y6tbswk.aspx.
– Rich C
Feb 7 '14 at 3:35
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How to disable HTML links
...it by yourself before using this. It has the advantage to work without JavaScript. Unfortunately (but obviously) tabindex cannot be changed from CSS.
Intercept clicks
Use a href to a JavaScript function, check for the condition (or the disabled attribute itself) and do nothing in case.
$("td >...
How to check for null in Twig?
... Notice: as Twig 2.x check for variable is equal to value like is_ sameas must be {% if var is same as(false) %} not {% if var is sameas(false) %} see Doc url => twig.symfony.com/doc/2.x/tests/sameas.html
– ahmed hamdy
Jul 15 '19 at 17:01
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Why is Scala's immutable Set not covariant in its type?
...ameter of type A due to the contravariance of functions. Set could potentially be contravariant in A, but this too causes issues when you want to do things like this:
def elements: Iterable[A]
In short, the best solution is to keep things invariant, even for the immutable data structure. You'll...
How to checkout a specific Subversion revision from the command line?
...TortoiseSVN dialogs appear to collect user
input. If you want to write a script which requires no input, you
should use the official Subversion command line client instead.
Use the Subversion command-line svn.exe client. With the command-line client, you can
checkout a working copy in REV re...
Reading specific lines only
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with linecache.getlin('some_file', 4) I get the 4th line, not the 5th.
– Juan
Dec 11 '14 at 18:14
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LINQ: Distinct values
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Oh so by "larger type" you may mean I still want all properties in the result even though I only want to compare a few properties to determine distinctness?
– The Red Pea
Sep 20 '16 at 14:31
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Why do we need message brokers like RabbitMQ over a database like PostgreSQL?
...ustering options are also available.
In regards to AMQP, I would say a really cool feature is the "exchange", and the ability for it to route to other exchanges. This gives you more flexibility and enables you to create a wide array of elaborate routing typologies which can come in very handy when...
Git status - is there a way to show changes only in a specific directory?
...e exec perm
sudo chmod +x /usr/local/bin/gitstat
And calling that simple script: gitstat /path/to/foo-project. You can also use it while in foo-project just doing gitstat . and so suppose shorter than git status -s, git diff --stat or git diff --stat HEAD if your are always using console instead o...