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Foreign keys in mongo?
...field :name
has_many :scores
end
Edit:
> db.foo.insert({group:"phones"})
> db.foo.find()
{ "_id" : ObjectId("4df6539ae90592692ccc9940"), "group" : "phones" }
{ "_id" : ObjectId("4df6540fe90592692ccc9941"), "group" : "phones" }
>db.foo.find({'_id':ObjectId("4df6539ae...
Must Dependency Injection come at the expense of Encapsulation?
...using an OO language as the 'host', but the ideas behind IoC come from component-oriented software engineering, not OO.
Component software is all about managing dependencies - an example in common use is .NET's Assembly mechanism. Each assembly publishes the list of assemblies that it references, a...
What is the difference between compare() and compareTo()?
...art of the Comparator<T> interface, and the typical use is to define one or more small utility classes that implement this, to pass to methods such as sort() or for use by sorting data structures such as TreeMap and TreeSet. You might want to create a Comparator object for the following:
Mul...
When to use inline function and when not to use it?
...y inlined. The degree of cleverness of a compiler cannot be legislated, so one compiler might generate 720, another 6 * fac(5), and yet another an un-inlined call fac(6).
To make inlining possible in the absence of unusually clever compilation and linking facilities, the definition–and not j...
What's the difference between an exclusive lock and a shared lock?
... them to finish reading before she clears the board to write more => If one or more shared locks already exist, exclusive locks cannot be obtained.
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Dependency injection through constructors or property setters?
...of a class. You add a dependency and now all your users (subclasses and anyone instantiating you directly) suddenly know about it. That feels like a break of encapsulation.
...
How to pattern match using regular expression in Scala?
...ld like to be able to find a match between the first letter of a word, and one of the letters in a group such as "ABC". In pseudocode, this might look something like:
...
What is the difference between and ? [duplicate]
Both tags include the content from one page in another.
6 Answers
6
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How to make a Bootstrap accordion collapse when clicking the header div?
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this method doesn't work for iphone. per the answer to stackoverflow.com/questions/19866172/… it needs to be <a> (since it requires the href) in order for it to be collapsible on iphone... any ideas?
– minovsky
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Representing null in JSON
...the same as both "not undefined and not null", and if you were testing for one condition or the other, this might succeed whereas JSON1 would fail.
This is the definitive way to represent null per the JSON spec.
JSON3 {"myCount": 0}
In this case, myCount is 0. That's not the same as null, and it's ...