大约有 19,000 项符合查询结果（耗时：0.0290秒） [XML]
Rails migrations: self.up and self.down versus change
... rollback? It's not possible, so you need to define the down method.
As said, I suggest you to read the Rails Migrations Guide.
share
|
improve this answer
|
follow
...
Nginx not picking up site in sites-enabled?
...
I had the same problem. It was because I had accidentally used a relative path with the symbolic link.
Are you sure you used full paths, e.g.:
ln -s /etc/nginx/sites-available/example.com.conf /etc/nginx/sites-enabled/example.com.conf
...
Should I use encoding declaration in Python 3?
...hen you deviate from the default, or if you rely on other tools (like your IDE or text editor) to make use of that information.
In other words, as far as Python is concerned, only when you want to use an encoding that differs do you have to use that declaration.
Other tools, such as your editor, c...
Is it possible for intellij to organize imports the same way as in Eclipse?
...on a project where all the team members are using Eclipse and I'm the only IDEA user. This creates a lot of noise from imports rearrangements. The order in which eclipse imports is: Java, Javax, Org, Com, everything else in alphabetical order. Is it possible to configure IDEA to follow these rules?
...
How can I keep my fork in sync without adding a separate remote?
...
To avoid the confusing situation mention above, it'd better click the Edit button and manually switch the base fork to me/foobar and head fork to someone/foobar. In this way it's much clear
– macemers
...
PHP: Count a stdClass object
...
Count Normal arrya or object
count($object_or_array);
Count multidimensional arrya or object
count($object_or_array, 1); // 1 for multidimensional array count, 0 for Default
share
|
im...
Using HTML5/JavaScript to generate and save a file
I've been fiddling with WebGL lately, and have gotten a Collada reader working. Problem is it's pretty slow (Collada is a very verbose format), so I'm going to start converting files to a easier to use format (probably JSON). I already have the code to parse the file in JavaScript, so I may as well ...
When annotating a class with @Component, does this mean it is a Spring Bean and Singleton?
... creating Singletons, will i not run into concurrency issues? To my newbie idea it will results in a bean that is used throughout the ApplicationContext, so concurrent users will get a reference to the single bean. Or am i missing something?
– Marco
May 6 '11 a...
Why declare a struct that only contains an array in C?
...sistent that is. For C++ it looks for an == operator. In C it says "invalid operands to binary ==".
– Matt
Dec 22 '11 at 1:43
add a comment
|
...
Enable zooming/pinch on UIWebView
...f UIWebView
self.mWebview.frame = CGRectMake(0, 35, self.view.bounds.size.width, self.view.bounds.size.height - 80); // set frame whatever you want..
[self.mWebview setOpaque:NO];
self.mWebview.backgroundColor = [UIColor clearColor];
[self.view addSubview:self.mWebview];
With load HTML file/conten...