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Add a reference column migration in Rails 4
...migration AddUserToUploads user:references
Which will create a migration file as:
class AddUserToUploads < ActiveRecord::Migration
def change
add_reference :uploads, :user, index: true
end
end
Then, run the migration using rake db:migrate.
This migration will take care of adding a ne...
Python's os.makedirs doesn't understand “~” in my path
..._dir is called tilde expansion and is a common user interface feature. The file system does not know anything about it.
In Python, this feature is implemented by os.path.expanduser:
my_dir = os.path.expanduser("~/some_dir")
...
Why use pip over easy_install? [closed]
...ent state of things:
Binary packages are now distributed as wheels (.whl files)—not just on PyPI, but in third-party repositories like Christoph Gohlke's Extension Packages for Windows. pip can handle wheels; easy_install cannot.
Virtual environments (which come built-in with 3.4, or can be adde...
Iterating each character in a string using Python
...much anything in python using the for loop construct,
for example, open("file.txt") returns a file object (and opens the file), iterating over it iterates over lines in that file
with open(filename) as f:
for line in f:
# do something with line
If that seems like magic, well it kind...
How to put a UserControl into Visual Studio toolBox
...i moved the code into another project, create a dll, and reference the dll file, the custom control does not show up.
– Fandi Susanto
Dec 8 '14 at 9:18
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高并发服务端分布式系统设计概要 - C/C++ - 清泛网 - 专注C/C++及内核技术
...口（废话否则怎么存取数据），group的底层可以是实际的File System，甚至是HDFS。Group Master和Group Slave可以共享同一个File System（用于不能丢数据的强一致性系统），也可以分别指向不同的File System（用于弱一致性，允许停写服务和...
How to display double quotes(") Symbol in a TextView?
I'm trying to display some words in double quotes, in Text view in in xml file. But its not working. Pls help me.
9 Ans...
Is there a command to undo git init?
...
rmdir /s .git if you already add a remote to force files and subfolders
– dpineda
Oct 15 '15 at 23:14
...
sass --watch with automatic minify?
...onsult the documentation for updates:
http://sass-lang.com/documentation/file.SASS_REFERENCE.html#using_sass
http://sass-lang.com/documentation/file.SASS_REFERENCE.html#output_style
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impro...
Where does Console.WriteLine go in ASP.NET?
... System.out.println() , my text goes to standard out, which is mapped to a file by the WebSphere admin console.
12 Answers
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