大约有 47,000 项符合查询结果（耗时：0.0617秒） [XML]
“render :nothing => true” returns empty plaintext file?
... Rails versions. For Rails 4+, see William Denniss' post below.
Sounds to me like the content type of the response isn't correct, or isn't correctly interpreted in your browser. Double check your http headers to see what content type the response is.
If it's anything other than text/html, you can ...
How to create index in Entity Framework 6.2 with code first
...
Well 26.10.2017 Entity Framework 6.2 was officially released.
It includes a possibility to define indexes with ease via Fluent API. Ho it is to use was already announced in the beta of 6.2.
Now you can use the HasIndex() method, followed by IsUnique(...
Bash variable scope
Please explain to me why the very last echo statement is blank? I expect that XCODE is incremented in the while loop to a value of 1:
...
Executing elements inserted with .innerHTML
I've got a script that inserts some content into an element using innerHTML .
20 Answers
...
Automatically deleting related rows in Laravel (Eloquent ORM)
...{
return $this->has_many('Photo');
}
// this is a recommended way to declare event handlers
public static function boot() {
parent::boot();
static::deleting(function($user) { // before delete() method call this
$user->photos()->delete();
...
What is the use case of noop [:] in bash?
...ent in Unix v6. : was a label indicator for the Thompson shell's goto statement. The label could be any text, so : doubled up as a comment indicator (if there is no goto comment, then : comment is effectively a comment). The Bourne shell didn't have goto but kept :.
A common idiom that uses : is : ...
Undefined reference to static class member
...
You need to actually define the static member somewhere (after the class definition). Try this:
class Foo { /* ... */ };
const int Foo::MEMBER;
int main() { /* ... */ }
That should get rid of the undefined reference.
...
How can I change my default database in SQL Server without using MS SQL Server Management Studio?
...use the dropped database as its default. I can connect to SQL Server Management Studio by using the 'options' button in the connection dialog and selecting 'master' as the database to connect to. However, whenever I try to do anything in object explorer, it tries to connect using my default database...
How to set up tmux so that it starts up with specified windows opened?
... I have the following in a shell script that I call dev-tmux. A dev environment:
#!/bin/sh
tmux new-session -d 'vim'
tmux split-window -v 'ipython'
tmux split-window -h
tmux new-window 'mutt'
tmux -2 attach-session -d
So everytime I want to launch my favorite dev environment I can just do
$ dev-...
MySQL INNER JOIN select only one row from second table
I have a users table and a payments table, for each user, those of which have payments, may have multiple associated payments in the payments table. I would like to select all users who have payments, but only select their latest payment. I'm trying this SQL but i've never tried nested SQL sta...