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Run a single migration file
... ruby file:
rails console
>> require "db/migrate/20090408054532_add_foos.rb"
>> AddFoos.up
Note: newer versions of rails may require AddFoos.new.up rather than AddFoos.up.
An alternative way (without IRB) which relies on the fact that require returns an array of class names:
script/...
How to define a function in ghci across multiple lines?
...rect, but :{ and :} must each appear on their own line:
> :{
> let foo a b = a +
> b
> :}
> :t foo
foo :: (Num a) => a -> a -> a
This also interacts with the layout rule, so when using do-notation it might be easier to use braces and semi-colons explicitly. For ...
Java Enum definition
...
It still allows me to create a class Foo extends Node<City> where Foo is unrelated to City.
– newacct
Nov 23 '11 at 22:43
1
...
Autoreload of modules in IPython [duplicate]
... In [1]: %load_ext autoreload
In [2]: %autoreload 2
In [3]: from foo import some_function
In [4]: some_function()
Out[4]: 42
In [5]: # open foo.py in an editor and change some_function to return 43
In [6]: some_function()
Out[6]: 43
The module was reloaded without reload...
What is move semantics?
...to members
Sooner or later, you are going to write code like this:
class Foo
{
unique_ptr<Shape> member;
public:
Foo(unique_ptr<Shape>&& parameter)
: member(parameter) // error
{}
};
Basically, the compiler will complain that parameter is an lvalue. If you...
Only initializers, entity members, and entity navigation properties are supported
...he DB Model to the View Model.
Look for a [NotMapped] property with name Foo in your DB Model.
Look for a property with the same name, Foo, in your View Model.
If that is the case, then change your AutoMapper config. Add .ForMember(a => a.Foo, b => b.Ignore());
...
Split string in Lua?
...
Doesn't work if string contains empty values, eg. 'foo,,bar'. You get {'foo','bar'} instead of {'foo', '', 'bar'}
– andras
Sep 19 '16 at 21:38
5
...
Validating parameters to a Bash script
... it as a commentar). i did "$#" to fix it. second, the regex also matches "foo123bar". i fixed it by doing ^[0-9]+$. you may also fix it by using grep's -x option
– Johannes Schaub - litb
Mar 31 '09 at 1:21
...
How to update PATH variable permanently from Windows command line?
...nvironment:PATH=...
...
> REM ## Query env-var:
> setenv.py PATH C:\foo
!!!Cannot access HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\Environment:PATH due to: [WinError 5] Access is denied
!!!Cannot find HKEY_CURRENT_USER\Environment:PATH due to: [WinError 2] The syst...
What does the “at” (@) symbol do in Python?
...ons and class definitions
for more about decorators.
So, we see that
@foo
def bar():
pass
is semantically the same as:
def bar():
pass
bar = foo(bar)
They are not exactly the same because Python evaluates the foo expression (which could be a dotted lookup and a function call) befo...