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Introducing FOREIGN KEY constraint may cause cycles or multiple cascade paths - why?
...I'm using EF Codefirst migrations and the migrations are failing with this error:
16 Answers
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Get the _id of inserted document in Mongo database in NodeJS
... console.log(result.insertedId);
})
.catch(err => {
// handle error
});
It's the same thing if you use callbacks.
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Converting between datetime, Timestamp and datetime64
...>> numpy.__version__
'1.6.2' # current version available via pip install numpy
I can reproduce the long value on numpy-1.8.0 installed as:
pip install git+https://github.com/numpy/numpy.git#egg=numpy-dev
The same example:
>>> from datetime import datetime
>>> import num...
Take the content of a list and append it to another list
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Take a look at itertools.chain for a fast way to treat many small lists as a single big list (or at least as a single big iterable) without copying the smaller lists:
>>> import itertools
>>> p = ['a', 'b', 'c']
>>> q = ['d', 'e', 'f']
>>> r = ['g', ...
java.lang.UnsupportedClassVersionError: Bad version number in .class file?
I am getting this error when I include an opensource library that I had to compile from source. Now, all the suggestions on the web indicate that the code was compiled in one version and executed in another version (new on old). However, I only have one version of JRE on my system. If I run the c...
ReSharper warns: “Static field in generic type”
...jority of cases, having a static field in a generic type
is a sign of an error. The reason for this is that a static field in a
generic type will not be shared among instances of different close
constructed types. This means that for a generic class C<T> which
has a static field X, the...
The $.param( ) inverse function in JavaScript / jQuery
...ht with accepted answer "this won't work with arrays". Your solution works all right.
– Robert Koritnik
Sep 16 '09 at 12:44
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数据存储组件 · App Inventor 2 中文网
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云数据库是一个不可见组件，允许您将数据存储在连接到互联网的数据库服务器上（使用Redis），这样你的App上所有用户就能共享数据。 默认情况下，数据将存储在 MIT 维护的服务器中，但是您可以设置和运行自己的服务...
Xcode 4 hangs at “Attaching to (app name)”
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This doesn't fix the error for me. Using XCode 4.0.1, I start a new project, build and run it without modifying the default template - works. Without quitting the simulator, I make some changes, run again, still works. Then I quit XCode and the s...
Windows 7, 64 bit, DLL problems
...e to an empty folder: myproject.exe
Try to execute it, It will retrieve an error (missing DLL files...).
Now, copy all the DLL files from Qt (in my case they were in C:\Qt\Qt5.1.1\5.1.1\msvc2012_64_opengl\bin) to this folder.
Try to execute again, it will probably works fine.
Start to delete progres...