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Django - filtering on foreign key properties
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Is this going to hit the DB twice, should I be using select_related() to make this more optimal?
– Fraser Graham
Dec 30 '09 at 22:52
5
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How to create a directory using nerdtree
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Pressing m would open a menu below and you can select from a list of actions.
NERDTree Menu. Use j/k/enter and the shortcuts indicated
==========================================================
> (a)dd a childnode
(m)ove the current node
(d)elete the current node
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Best practices for large solutions in Visual Studio (2008) [closed]
...projects
We use the 'add reference' context menu option. If 'project' is selected, then the dependency is added to our single, global solution file by default.
2. Should "copy local" be on or off?
Off in our experience. The extra copying just adds to the build times.
3. Should every project bu...
How to remove items from a list while iterating?
...modify the old list in place. That's different from what you'd be doing by selective removal, as in @Lennart's suggestion -- it's faster, but if your list is accessed via multiple references the fact that you're just reseating one of the references and NOT altering the list object itself can lead to...
Why does Java's hashCode() in String use 31 as a multiplier?
... for 31 since 33 is not a prime:
Of the remaining
four, I'd probably select P(31), as it's the cheapest to calculate on a RISC
machine (because 31 is the difference of two powers of two). P(33) is
similarly cheap to calculate, but it's performance is marginally worse, and
33 is composit...
Entity Framework - Add Navigation Property Manually
...also make sure that you get your Primary Key definition right (right click select related fields, mark them as EntityKey in the properties). Otherwise you might get 'Multiplicity is not valid in Role in relationship Because the Dependent Role refers to the key properties...'
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List distinct values in a vector in R
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You can also use the sqldf package in R.
Z <- sqldf('SELECT DISTINCT tablename.columnname FROM tablename ')
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How do I sort unicode strings alphabetically in Python?
...just wanted to point out one coding inefficiency in Human Sort. To apply a selective char-by-char translation to a unicode string s, it uses the code:
spec_dict = {'Å':'A', 'Ä':'A'}
def spec_order(s):
return ''.join([spec_dict.get(ch, ch) for ch in s])
Python has a much better, faster and ...
LoadRunner中参数化技术详解 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...更新方式：
Update Value on
（更新方法）
Select next row
（数据分配方法）
Sequential顺序
Random随机
Unique唯一
Each Iteration（每次迭代）
对于每次迭代，Vuser会从数据表中提取下一...
GitHub: How to make a fork of public repository private?
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Just go to https://github.com/new/import paste the repo you want and select Private
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