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Foreign Key naming scheme
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The standard convention in SQL Server is:
FK_ForeignKeyTable_PrimaryKeyTable
So, for example, the key between notes and tasks would be:
FK_note_task
And the key between tasks and users would be:
FK_task_user
This gives you an 'at a glance' view of which tables ...
Do I need to explicitly call the base virtual destructor?
...of concept with results:
class base {
public:
base() { cout << __FUNCTION__ << endl; }
~base() { cout << __FUNCTION__ << endl; }
};
class derived : public base {
public:
derived() { cout << __FUNCTION__ << endl; }
~derived() { cout << __FU...
Should I be using object literals or constructor functions?
...on () {
return this.x + this.y + this.z;
}
};
var ObjCon = function(_x, _y, _z) {
var x = _x; // private
var y = _y; // private
this.z = _z; // public
this.add = function () {
return x + y + this.z; // note x, y doesn't need this.
};
};
// use the objects:
objLit.x = 3;
objLit...
How do I remove all .pyc files from a project?
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This ignores .pyo files and __pycache__ directories. See my answer.
– Wilfred Hughes
Apr 7 '14 at 15:03
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Using module 'subprocess' with timeout
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In Python 3.3+:
from subprocess import STDOUT, check_output
output = check_output(cmd, stderr=STDOUT, timeout=seconds)
output is a byte string that contains command's merged stdout, stderr data.
check_output raises CalledProcessError on non-zero exit status as specified i...
Foreign keys in mongo?
...his:
class Student
include Mongoid::Document
field :name
embeds_many :addresses
embeds_many :scores
end
class Address
include Mongoid::Document
field :address
field :city
field :state
field :postalCode
embedded_in :student
end
class Score
include Mongoi...
“x not in y” or “not x in y”
...am' not in 'spam and eggs'
>>> dis.dis(notin)
2 0 LOAD_CONST 1 ('ham')
3 LOAD_CONST 2 ('spam and eggs')
6 COMPARE_OP 7 (not in)
9 POP_TOP
10 LOAD_CONST 0 (...
Is there a way of having git show lines added, lines changed and lines removed?
...he -m option is for showing the number of modified lines.
Sample output:
app/controllers/application_controller.rb | 30 -------------------!!!
1 files changed, 0 insertions(+), 26 deletions(-), 4 modifications(!)
The count for the number of lines modified is approximate, as man diffstat says:...
How do I count a JavaScript object's attributes? [duplicate]
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Use underscore library, very useful: _.keys(obj).length.
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Iterate an iterator by chunks (of n) in Python? [duplicate]
...', 'x') --> ABC DEF Gxx"
args = [iter(iterable)] * n
return izip_longest(fillvalue=fillvalue, *args)
It will fill up the last chunk with a fill value, though.
A less general solution that only works on sequences but does handle the last chunk as desired is
[my_list[i:i + chunk_size] f...