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How do I print out the contents of an object in Rails for easy debugging?
...
I generally first try .inspect, if that doesn't give me what I want, I'll switch to .to_yaml.
class User
attr_accessor :name, :age
end
user = User.new
user.name = "John Smith"
user.age = 30
puts user.inspect
#=> #<User:0x...
ruby on rails f.select options with custom attributes
...at you want:
(1) Using a custom attribute name in HTML5. In HTML5 you are allowed to have custom attribute names, but they have to be pre-pended with 'data-'. These custom attributes will not get submitted with your form, but they can be used to access your elements in Javascript. If you want to ac...
How to remove selected commit log entries from a Git repository while keeping their changes?
...ke to remove.
git rebase --onto commit-id^ commit-id
Note that this actually removes the change that was introduced by the commit.
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设置用户默认权限 Umask命令详解 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...22 = 644
注：权限计算实际上是二进制位的与操作，参考All About the umask and Permissions。
操作bar.tar
shell> tar xf bar.tar
这次有点不同，我们要运行两次tar命令。
第一次：以root身份运行tar命令，然后查看目录和文件的权限，分别...
can't push to branch after rebase
...erge on my development branches because they'll be rebased at any time. Usually the workflow is as follows:
o-----o-----o-----o-----o-----o master
\
o-----o-----o devel0
\
o-----o-----o devel1
Then to stay up-to-date with remo...
Adding information to an exception?
...essage + ' happens at %s' % arg1)
bar('arg1')
Traceback (most recent call last):
File "test.py", line 13, in <module>
bar('arg1')
File "test.py", line 11, in bar
raise type(e)(e.message + ' happens at %s' % arg1)
IOError: Stuff happens at arg1
Update 1
Here's a slight modif...
boost Composite keys - C/C++ - 清泛网 - 专注C/C++及内核技术
... first key, then the second key if the first one is equal, etc. This order allows for partial searches where only the first keys are specified:
phonebook pb;
...
// look for all Whites
std::pair<phonebook::iterator,phonebook::iterator> p=
pb.equal_range(boost::make_tuple(std::string("Whi...
if A vs if A is not None:
...
The statement
if A:
will call A.__nonzero__() (see Special method names documentation) and use the return value of that function. Here's the summary:
object.__nonzero__(self)
Called to implement truth value testing and the built-in operation ...
How to set or change the default Java (JDK) version on OS X?
...
those really are backticks the export line
– David West
Nov 27 '14 at 19:38
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How to remove old Docker containers
...can use Docker container prune:
docker container prune
This will remove all stopped containers and should work on all platforms the same way.
There is also a Docker system prune:
docker system prune
which will clean up all unused containers, networks, images (both dangling and unreferenced), ...