大约有 40,000 项符合查询结果（耗时：0.0300秒） [XML]
A migration to add unique constraint to a combination of columns
...ship.create!(user_id: user_id, post_id: post_id)
Fully runnable example: https://gist.github.com/Dorian/9d641ca78dad8eb64736173614d97ced
db/schema.rb generated: https://gist.github.com/Dorian/a8449287fa62b88463f48da986c1744a
...
How can query string parameters be forwarded through a proxy_pass with nginx?
...s nginx to replace /service/ with / when passing the request.
proxy_pass http://apache/;
}
Or if you want to use the regex location, just include the args:
location ~* ^/service/(.*) {
proxy_pass http://apache/$1$is_args$args;
}
...
Why is WinRT unmanaged? [closed]
... use WinRT without jumping through the hoops that C++/CLI introduces ( see http://www2.research.att.com/~bs/bs_faq.html#CppCLI ) It does mean though that you will still have to study COM if you want to use WinRT.
The real question is 'why is COM necessary? why did Microsoft have to invent it?' B...
Use cases for the 'setdefault' dict method
..., because it only creates keys on explicit access. Think you use something HTTP-ish with many headers -- some are optional, but you want defaults for them:
headers = parse_headers( msg ) # parse the message, get a dict
# now add all the optional headers
for headername, defaultvalue in optional_head...
Python time measure function
... need is to wrap your function up using decorators. More explanation here: http://www.pythoncentral.io/time-a-python-function/
The only case where you might be interested in writing your own timing statements is if you want to run a function only once and are also want to obtain its return value.
...
Creating a singleton in Python
...ion of a class means and how to implement that definition. See for example http://code.activestate.com/recipes/498149/, which essentially recreates C-style structs in Python using metaclasses. The thread What are some (concrete) use-cases for metaclasses? also provides some examples, they generally ...
How to verify Facebook access token?
...
You can simply request https://graph.facebook.com/me?access_token=xxxxxxxxxxxxxxxxx if you get an error, the token is invalid. If you get a JSON object with an id property then it is valid.
Unfortunately this will only tell you if your token is v...
If REST applications are supposed to be stateless, how do you manage sessions?
...
Statelessness means that every HTTP request happens in complete isolation. When the client makes an HTTP request, it includes all the information necessary for the server to fulfill that request. The server never relies on information from previous request...
Rails detect if request was AJAX
...est.xhr?
Returns true if the “X-Requested-With” header contains “XMLHttpRequest”....
But BEWARE that
request.xhr?
returns numeric or nil values not BOOLEAN values as the docs say, in accordance with =~.
irb(main):004:0> /hay/ =~ 'haystack'
=> 0
irb(main):006:0> /stack/ =~ '...
Can I have an onclick effect in CSS?
...d="btnControl"/>
<label class="btn" for="btnControl"><img src="https://placekitten.com/200/140" id="btnLeft" /></label>
With that being said, there is some bad news. Because a label can only be associated with one form control at a time, that means you can't just drop a bu...