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An item with the same key has already been added
...ch contains the same property twice. Perhaps you are using new to hide the base property.
Solution is to override the property or use another name.
If you share your model, we would be able to elaborate more.
share
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通信连接组件 · App Inventor 2 中文网
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SimpleBase64 拓展
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MqttClient 拓展
ClientSocket 拓展
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What is the difference between List (of T) and Collection(of T)?
...em(...) method with a public void new InsertItem(...) and then calling the base.InsertItem(...) from within ? It would still not break the contract. (the name is 'Insert' in List, but nonetheless). So what is the big deal in sticking to Collections<T> ?
– DeeStackOverflow...
How do I specify a single test in a file with nosetests?
...s done from the anaconda command prompt as follows:
ran nosetests from:
(base) C:\Users\ABC\Documents\work\
but test_MyTestFile.py and methodsFile.py were in:
(base) C:\Users\ABC\Documents\work\daily\
run single test by including path with quotes as follows:
(base) C:\Users\ABC\Documents\w...
How do I raise the same Exception with a custom message in Python?
...ocs.python.org/2/library/exceptions.html - "exception EnvironmentError The base class for exceptions that can occur outside the Python system: IOError, OSError. When exceptions of this type are created with a 2-tuple, the first item is available on the instance’s errno attribute (it is assumed to ...
Find a string by searching all tables in SQL Server Management Studio 2008
Is there any way to search for a string in all tables of a database in SQL Server Management Studio 2008?
8 Answers
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Pushing an existing Git repository to SVN
...git svn init protocol:///path/to/repo/PROJECT -s
4. git svn fetch
5. git rebase origin/trunk
5.1. git status
5.2. git add (conflicted-files)
5.3. git rebase --continue
5.4. (repeat 5.1.)
6. git svn dcommit
After #3 you'll get a cryptic message like this:
Using higher level of URL: protocol...
Save image from URL by paperclip
...
Here is a simple way:
require "open-uri"
class User < ActiveRecord::Base
has_attached_file :picture
def picture_from_url(url)
self.picture = open(url)
end
end
Then simply :
user.picture_from_url "http://www.google.com/images/logos/ps_logo2.png"
...
Is there “0b” or something similar to represent a binary number in Javascript
...gned a number that looks like it's in binary, but is actually being parsed base 10. The parseInt function expects a string as the first arg, so it turns it into "1111" (base 10 representation), then re-parses it as if it were base 2.
– Ted Hopp
Sep 12 '12 at 21...
Timer function to provide time in nano seconds using C++
...en RDTSC and your system's built-in clock facilities (which will likely be based on clock(), clock_gettime() and/or QueryPerformanceCounter.
Note that the RDTSC instruction is x86-specific. QueryPerformanceCounter is Windows only. And clock_gettime() is POSIX only. Below I introduce two new cloc...