大约有 40,000 项符合查询结果（耗时：0.0300秒） [XML]
how to prevent “directory already exists error” in a makefile when using mkdir
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"Generally, stick to the widely-supported (usually posix-specified) options and features of these programs. For example, don't use ‘mkdir -p’, convenient as it may be, because a few systems don't support it at all and with othe...
RSpec: how to test if a method was called?
...do
expect(subject).to receive(:bar).with("an argument I want")
subject.foo
end
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setMaxResults for Spring-Data-JPA annotation?
...t; {
@Query("from User u where ...")
List<User> findAllUsersWhereFoo(@Param("foo") Foo foo, Pageable pageable);
default List<User> findTop10UsersWhereFoo(Foo foo) {
return findAllUsersWhereFoo(foo, new PageRequest(0,10));
}
}
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Check if a given key already exists in a dictionary
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I usually just use get if I'm going to be pulling the item out of the dictionary anyway. No sense in using in and pulling the item out of the dictionary.
– Jason Baker
Oct 21 '09 at 19:12
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What is the difference between Type and Class?
...primitives are classes (or more exactly structs).
– dalle
Jan 22 '09 at 7:10
4
@dalle: agreed, th...
Why the switch statement cannot be applied on strings?
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The reason why has to do with the type system. C/C++ doesn't really support strings as a type. It does support the idea of a constant char array but it doesn't really fully understand the notion of a string.
In order to generate the code for a switch statement the compiler must under...
setState vs replaceState in React.js
...ows out the current state, and replaces it with only what you provide. Usually setState is used unless you really need to remove keys for some reason; but setting them to false/null is usually a more explicit tactic.
While it's possible it could change; replaceState currently uses the object passe...
AngularJS - placeholder for empty result from filter
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I use ng-controller="FooController as $ctrl" and did "bar in $ctrl.filteredBars = (bars | filter:barFilter)" so I could even use $ctrl.filteredBars.length outside the ng-repeat. Thanks for this epic hint!
– xlttj
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RegEx to exclude a specific string constant [duplicate]
...siest way would be to use a negative-match option, for example:
$var !~ /^foo$/
or die "too much foo";
If not, you have to do something evil:
$var =~ /^(($)|([^f].*)|(f[^o].*)|(fo[^o].*)|(foo.+))$/
or die "too much foo";
That one basically says "if it starts with non-f, the rest can be...
What's the difference between belongs_to and has_one?
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They essentially do the same thing, the only difference is what side of the relationship you are on. If a User has a Profile, then in the User class you'd have has_one :profile and in the Profile class you'd have belongs_to :user. To det...