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How do you query for “is not null” in Mongo?
...: 1 }
{ "_id" : ObjectId("544540f11b5cf91c4893eb99"), "otherField" : 2 }
Now, create the sparse index on imageUrl field:
db.foo.ensureIndex( { "imageUrl": 1 }, { sparse: true } )
{
"createdCollectionAutomatically" : false,
"numIndexesBefore" : 1,
"numIndexesAfter" : 2,
"ok" : 1
}
...
How to install PyQt4 on Windows using pip?
... "AMD64". To make it short: AMD's version was better and Intel adopted it, now calling it Intel64 for their CPUs - both are pretty much compatible (very minor differences). So pretty much every 64bit x86-64 CPU out there (except Itaniums) uses AMD64.
– user136036
...
How do I get the number of elements in a list?
...
items.append("apple")
items.append("orange")
items.append("banana")
And now:
len(items)
returns 3.
Explanation
Everything in Python is an object, including lists. All objects have a header of some sort in the C implementation.
Lists and other similar builtin objects with a "size" in Python...
Open file in a relative location in Python
Suppose python code is executed in not known by prior windows directory say 'main' , and wherever code is installed when it runs it needs to access to directory 'main/2091/data.txt' .
...
What is the simplest way to convert a Java string from all caps (words separated by underscores) to
...es they need a routine to swap the case of letters. They implement it. You now have ~20 lines to maintain. You would have ~2 if you used the library. And don't forget the unit tests! * The accepted answer has a downside in that the method name does not describe what the code does. A well reused API ...
test if event handler is bound to an element in jQuery [duplicate]
...ution but seems effective enough! The second time you ‘click’ you can know with certainty that it will not create a duplicate binding.
I therefore use die() or unbind() like this:
$("#someid").die("click").live("click",function(){...
or
$("#someid").unbind("click").bind("click",function(){....
Overloading Macro on Number of Arguments
...unctions:
int FOO4(int a, int b, int c, int d) { return a + b + c + d; }
Now you can use FOO with 2, 3 and 4 arguments:
FOO(42, 42) // will use makro function FOO2
FOO(42, 42, 42) // will use makro function FOO3
FOO(42, 42, 42, 42) // will call FOO4 function
Limitations
Only up to 63 argument...
Mongoose, Select a specific field with find
...
There is a shorter way of doing this now:
exports.someValue = function(req, res, next) {
//query with mongoose
dbSchemas.SomeValue.find({}, 'name', function(err, someValue){
if(err) return next(err);
res.send(someValue);
});
//this e...
How to clone all remote branches in Git?
...track the remote branch, which usually means the origin/branch_name branch
Now, if you look at your local branches, this is what you'll see:
$ git branch
* experimental
master
You can actually track more than one remote repository using git remote.
$ git remote add win32 git://example.com/users/j...
How to read/process command line arguments?
...
at this point (12/2011), argparse is now considered a better option than optparse, correct?
– oob
Dec 20 '11 at 21:48
55
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