大约有 16,000 项符合查询结果（耗时：0.0250秒） [XML]
find() with nil when there are no records
... I found a weird issue with Rails 4.2 where when you pass a hash as 'x' to Something.find_by(id: x) it would create a SQL statement with all the attribute/value pairs of the hash as part of the WHERE clause. Looks like a Rails bug to me.
– Tilo
May 24 '...
Objective-C for Windows
...
Expanding on the two previous answers, if you just want Objective-C but not any of the Cocoa frameworks, then gcc will work on any platform. You can use it through Cygwin or get MinGW. However, if you want the Cocoa frameworks...
do you have kcachegrind like profiling tools for mac [closed]
...
I ended up using qcachegrind on OSX. It can be installed via brew
brew install qcachegrind
or, to enable graphviz support:
brew install qcachegrind --with-graphviz
What's great about this program is that I successfully loaded a 6.1GB cachegrind file on ...
How do you properly use namespaces in C++?
...lowing what bernhardrusch has said, I tend not to use the "using namespace x" syntax at all, I usually explicitly specify the namespace when instantiating my objects (i.e. the first example I showed).
And as you asked below, you can use as many namespaces as you like.
...
C# 4 default parameter values: How to assign a default DateTime/object value? [duplicate]
...it with attributes.
.method private hidebysig static void foo([opt] int32 x) cil managed
{
.param [1] = int32(5)
.maxstack 8
L_0000: nop
L_0001: ret
}
.method //this is a new method
private hidebysig static //it is private, ???, and static
void foo //it returns nothing (void) ...
How to remove a project (from the workspace) in PHPStorm?
...e manually. If you do so, you will see the folder disappear from Phpstorm explore window. This might be weird, but true.
B. Remove from the recent project panel of Phpstorm 2018.3
(The folder after such removal will hide and a creation of the same name of project will restore the removed from t...
Parallel.ForEach vs Task.Run and Task.WhenAll
...ed Task.Run(()=> Parallel.ForEach(....)); It stopped crashing. Can you explain why? Please note i constrain the parallel options to the number of cores on system.
– monkeyjumps
Nov 6 '14 at 18:33
...
Convert boolean to int in Java
...
In the case where myBoolean stands for a boolean expression, using parenthesis is more readable.
– rsp
Sep 25 '10 at 12:33
40
...
Best way to structure a tkinter application? [closed]
... root = tk.Tk()
MainApplication(root).pack(side="top", fill="both", expand=True)
root.mainloop()
The important things to notice are:
I don't use a wildcard import. I import the package as "tk", which requires that I prefix all commands with tk.. This prevents global namespace pollution...
How to hide status bar in Android
I referred this link . In that if the user clicks on EditText(for ex To: ) at that time keyboard will be popped out and at the same time the user can be able to scroll to see all remaining views(ex: compose,subject, send button) in that screen. Similarly in my app I have one activity in that I am ...