大约有 25,000 项符合查询结果（耗时：0.0391秒） [XML]
find() with nil when there are no records
...
Yes, just do:
Challenge.find_by_id(10)
For Rails 4 and 5:
Challenge.find_by(id: 10)
share
|
improve this answer
|
follow
...
How to open every file in a folder?
... answered Aug 16 '13 at 13:15
le_vinele_vine
90655 silver badges1414 bronze badges
...
How to set a bitmap from resource
...
Highly active question. Earn 10 reputation in order to answer this question. The reputation requirement helps protect this question from spam and non-answer activity.
...
Could not load NIB in bundle
...wered Jun 17 '11 at 0:08
creator_11creator_11
70111 gold badge66 silver badges1111 bronze badges
...
Convert string with commas to array
...ols: like e.g. "0,s" any ideas how to fix that?
– sqp_125
Aug 31 '17 at 12:48
1
@sqp_125 try 0,'s...
I can not find my.cnf on my windows computer [duplicate]
... be called my.ini. MySQL looks for it in the following locations (in this order):
%PROGRAMDATA%\MySQL\MySQL Server 5.7\my.ini, %PROGRAMDATA%\MySQL\MySQL Server 5.7\my.cnf
%WINDIR%\my.ini, %WINDIR%\my.cnf
C:\my.ini, C:\my.cnf
INSTALLDIR\my.ini, INSTALLDIR\my.cnf
See also http://dev.mysql.com/doc...
将 App Inventor 2 项目连接到外部传感器 · App Inventor 2 中文网
... port 13.
Ultrasonic sensors: port 36
Luminosity sensor: TwiMaster 1
In order to initialize all of the motors for use, the method “SetupMotors” must be called when the app starts and the screen is initialized. Here is an example of how simple the new blocks are to use:
Tutorials
A tutoria...
Plot yerr/xerr as shaded region rather than error bars
...
Highly active question. Earn 10 reputation in order to answer this question. The reputation requirement helps protect this question from spam and non-answer activity.
...
How do I set a ViewModel on a window in XAML using DataContext property?
...MarkupExtension, IValueConverter where T : class, new() { private static T _converter; public override object ProvideValue(IServiceProvider serviceProvider) { return _converter ?? (_converter = new T()); } }
– Whazz
May 19 '18 at 22:30
...
Reducing the space between sections of the UITableView
...
Why not use CGFLOAT_MIN? It's made for these kind of scenarios :)
– Andrei Filip
May 11 '15 at 9:38
12
...