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Elegant way to invert a map in Scala
... different keys associated with same values. So, if you are interested in knowing all the keys, here's the code:
scala> val m = Map(1 -> "a", 2 -> "b", 4 -> "b")
scala> m.groupBy(_._2).mapValues(_.keys)
res0: Map[String,Iterable[Int]] = Map(b -> Set(2, 4), a -> Set(1))
...
Do I need dependency injection in NodeJS, or how to deal with …?
... dbCon = require('./lib/mydbconnection'); //wherever the file is stored
//now do something with the connection
var connection = dbCon.fetchConnection(); //mydbconnection.js is responsible for pooling, reusing, whatever your app use case is
//come TEST time of SuperCoolWebApp, you can set the requi...
Compare object instances for equality by their attributes
...lemented
return self.foo == other.foo and self.bar == other.bar
Now it outputs:
>>> x == y
True
Note that implementing __eq__ will automatically make instances of your class unhashable, which means they can't be stored in sets and dicts. If you're not modelling an immutable ty...
Can scrapy be used to scrape dynamic content from websites that are using AJAX?
... a JSON file:
Which presents all the information I'm looking for.
From now, I must implement all this knowledge in scrapy. Let's define the spider for this purpose:
class spider(BaseSpider):
name = 'RubiGuesst'
start_urls = ['http://www.rubin-kazan.ru/guestbook.html']
def parse(sel...
Remove by _id in MongoDB console
... new for the ObjectId.
Also, note that in some drivers/tools, remove() is now deprecated and deleteOne or deleteMany should be used instead.
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MySQL get the date n days ago as a timestamp
...B will do part of it depending on what you want
mysql> SELECT DATE_SUB(NOW(), INTERVAL 30 day);
2009-06-07 21:55:09
mysql> SELECT TIMESTAMP(DATE_SUB(NOW(), INTERVAL 30 day));
2009-06-07 21:55:09
mysql> SELECT UNIX_TIMESTAMP(DATE_SUB(NOW(), INTERVAL 30 day));
1244433347
...
How to solve Operator '!=' cannot be applied to operands of type 'T' and 'T' [duplicate]
...os: Yeah I wonder how many people are using the wrong method in their code now...
– user541686
Oct 21 '13 at 21:14
...
Java: Date from unix timestamp
...ent the
specified number of milliseconds since
the standard base time known as "the
epoch", namely January 1, 1970,
00:00:00 GMT.
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Semantic Issue: Property's synthesized getter follows Cocoa naming convention for returning 'owned'
... to synthesize it in the .m file (I have done this before with no issues). Now, I came across this: "Semantic Issue: Property's synthesized getter follows Cocoa naming convention for returning 'owned' objects."
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Python decorators in classes
...
Thanks Michael, only now saw that this is what I wanted.
– hcvst
Jan 18 '11 at 16:05
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