大约有 36,200 项符合查询结果（耗时：0.0564秒） [XML]
What is scope/named_scope in rails?
I've recently started an internship. My employer uses ruby on rails, and I frequently encounter new syntax that I need to look up to understand. I've googled around for a good explanation of named_scope, but what I've found so far is mostly blog posts giving high praise for it, rather a straight def...
Cancel/kill window.setTimeout() before it happens
...StatusIndicator()' is a function, you can gain performance (and type less) by simply: var timer1 = setTimeout(removeStatusIndicator, statusTimeout); This avoids the nested function calls.
– HarleyDave
Aug 29 '14 at 11:25
...
How to convert PascalCase to pascal_case?
...ing rules:
A sequence beginning with a lowercase letter must be followed by lowercase letters and digits;
A sequence beginning with an uppercase letter can be followed by either:
one or more uppercase letters and digits (followed by either the end of the string or an uppercase letter followed by...
Under what conditions is a JSESSIONID created?
...g the attributes in that
object, must never be shared between
contexts by the container.
(Servlet 2.4 specification)
Update: Every call to JSP page implicitly creates a new session if there is no session yet. This can be turned off with the session='false' page directive, in which case sessio...
What exactly do the Vagrant commands do?
...you may need.
vagrant gem is used to install Vagrant plugins via the RubyGems
system. In fact, vagrant gem is just a frontend to the actual gem
interface, with the difference being that Vagrant sets up a custom
directory where gems are installed so that they are isolated from your
system...
Handle file download from ajax post
... // IE workaround for "HTML7007: One or more blob URLs were revoked by closing the blob for which they were created. These URLs will no longer resolve as the data backing the URL has been freed."
window.navigator.msSaveBlob(blob, filename);
} else {
var URL = w...
What are free monads?
...er: A Monad is something that "computes" when monadic context is collapsed by join :: m (m a) -> m a (recalling that >>= can be defined as x >>= y = join (fmap y x)). This is how Monads carry context through a sequential chain of computations: because at each point in the series, the...
How can I pass a list as a command-line argument with argparse?
...nd the end result.
import argparse
parser = argparse.ArgumentParser()
# By default it will fail with multiple arguments.
parser.add_argument('--default')
# Telling the type to be a list will also fail for multiple arguments,
# but give incorrect results for a single argument.
parser.add_argument...
What's the difference between ngModel.$modelValue and ngModel.$viewValue
...t; component, where viewValue contains FileList object with files attached by the user. The Angular docs are confusing about this right now and should be updated.
– demisx
Feb 23 '15 at 17:59
...
What is causing “Unable to allocate memory for pool” in PHP?
...#ini.apc.ttl
The solution is to increase memory allocated to APC.
Do this by increasing apc.shm_size.
If APC is compiled to use Shared Segment Memory you will be limited by your operating system. Type this command to see your system limit for each segment :
sysctl -a | grep -E "shmall|shmmax"
T...