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Doctrine2: Best way to handle many-to-many with extra columns in reference table
...tself, and then you realize you have 3 objects, linked between them with a one-to-many and many-to-one relation.
http://groups.google.com/group/doctrine-user/browse_thread/thread/d1d87c96052e76f7/436b896e83c10868#436b896e83c10868
Once a relation has data, it's no more a relation !
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Generate all permutations of a list without adjacent equal elements
...ns safety.
The only way that a greedy step introduces a defect is if only one item type remains, in which case there is only one way to continue, and that way is safe. Otherwise, let P be the (safe) prefix just before the step under consideration, let P' be the prefix just after, and let S be an op...
Elegant way to invert a map in Scala
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You can avoid the ._1 stuff while iterating in few ways.
Here's one way. This uses a partial function that covers the one and only case that matters for the map:
Map() ++ (origMap map {case (k,v) => (v,k)})
Here's another way:
import Function.tupled
Map() ++ (origMap map ...
Keep SSH session alive [closed]
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@user271996, why should one restart a daemon for a client-side setting?
– maxschlepzig
Jun 2 '15 at 15:40
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When should one use a 'www' subdomain?
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You should choose one to be canonical mattcutts.com/blog/seo-advice-url-canonicalization
– Andrew Harry
Dec 19 '11 at 22:09
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Possible to do a MySQL foreign key to one of two possible tables?
... That is, the "foreign key" column contains an id value that must exist in one of a set of target tables. Typically the target tables are related in some way, such as being instances of some common superclass of data. You'd also need another column along side the foreign key column, so that on eac...
Constant Amortized Time
... There is a constant c, such that for
every sequence of operations (also one ending with a costly operation) of
length L, the time is not greater than
c*L (Thanks Rafał Dowgird)
share
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impr...
How to find and return a duplicate value in array
...}
I know this isn't very elegant answer, but I love it. It's beautiful one liner code. And works perfectly fine unless you need to process huge data set.
Looking for faster solution? Here you go!
def find_one_using_hash_map(array)
map = {}
dup = nil
array.each do |v|
map[v] = (map[v...
Difference between using bean id and name in Spring configuration file
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From the Spring reference, 3.2.3.1 Naming Beans:
Every bean has one or more ids (also
called identifiers, or names; these
terms refer to the same thing). These
ids must be unique within the
container the bean is hosted in. A
bean will almost always have only one
id, but if a b...
Bitwise operation and usage
...se operators are operators that work on multi-bit values, but conceptually one bit at a time.
AND is 1 only if both of its inputs are 1, otherwise it's 0.
OR is 1 if one or both of its inputs are 1, otherwise it's 0.
XOR is 1 only if exactly one of its inputs are 1, otherwise it's 0.
NOT is 1 only...