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Why is rbindlist “better” than rbind?
...bind.data.frame will account for the fact that columns may be in different orders, and match up by name), rbindlist doesn't do this kind of checking, and will join by position
eg
do.call(rbind, list(data.frame(a = 1:2, b = 2:3), data.frame(b = 1:2, a = 2:3)))
## a b
## 1 1 2
## 2 2 3
## 3 2 ...
Use ASP.NET MVC validation with jquery ajax?
...est;
}
}
}
What this does is return a JSON object specifying all of your model errors.
Example response would be
[{
"key":"Name",
"errors":["The Name field is required."]
},
{
"key":"Description",
"errors":["The Description field is required."]
}]
This would be retu...
How to stop mongo DB in one command
...
I believe the order for service is sudo service mongodb [start|stop|restart|status]. sudo service stop mongodb results in: stop: unrecognized service
– jacob
Jul 12 '13 at 16:21
...
Docker can't connect to docker daemon
...’t run Docker natively in OS X. So you have to install docker-machine in order to create VM and attach to it.
Install docker-machine on macOS
If you don't have docker-machine command yet, install it by using one of the following methods:
Using Brew command: brew install docker-machine docker.
...
Get ID of last inserted document in a mongoDB w/ Java driver
...h MongoDB plainly auto-generates ObjectId's. However, your solution of manually creating an ObjectId does work, and thanks for this option!
– Apophenia Overload
Dec 4 '12 at 8:39
...
Using OR in SQLAlchemy
...
@intgr The example showed by robru is still efficient, if you want to use another operator instead of in_, for example the LIKE operator.
– Lhassan Baazzi
Jul 12 '17 at 1:41
...
解决WaitForSingleObject阻塞UI线程的问题 - C/C++ - 清泛网 - 专注C/C++及内核技术
...ile (TRUE)
{
//wait for m_hThread to be over，and wait for
//QS_ALLINPUT（Any message is in the queue）
dwRet = MsgWaitForMultipleObjects(1, &hThread, FALSE, INFINITE, QS_ALLINPUT);
switch(dwRet)
{
case WAIT_OBJECT_0:
break; //break the loop
case WAIT_OBJECT_0 + 1:
...
Error in finding last used cell in Excel with VBA
... LookIn:=xlFormulas, _
SearchOrder:=xlByRows, _
SearchDirection:=xlPrevious, _
MatchCase:=False).Row
Else
lastrow = 1
End If
End With
Find Last Row in a Table (ListObject)
The same principles apply,...
How to Unit test with different settings in Django?
...
EDIT: This answer applies if you want to change settings for a small number of specific tests.
Since Django 1.4, there are ways to override settings during tests:
https://docs.djangoproject.com/en/dev/topics/testing/tools/#overriding-settings
TestCase will have a self.settings context ma...
Rails migration for has_and_belongs_to_many join table
...r_id:integer
(note the table name lists both join tables in alphabetical order)
and then for rails 3 and below only, you need to edit your generated migration so an id field is not created:
create_table :students_teachers, :id => false do |t|
...