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All Ruby tests raising: undefined method `authenticate' for nil:NilClass
... Also, check that you haven't included Devise::TestHelpers multiple times as this can cause issues.
– Joseph Siefers
Sep 1 '15 at 20:16
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StringLength vs MaxLength attributes ASP.NET MVC with Entity Framework EF Code First
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Also note that by default MVC 3 does not recognized MaxLengthAttribute, while EF does recognize StringLengthAttribute
– marcind
Apr 19 '11 at 18:09
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How do I make a simple makefile for gcc on Linux?
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Interesting, I didn't know make would default to using the C compiler given rules regarding source files.
Anyway, a simple solution that demonstrates simple Makefile concepts would be:
HEADERS = program.h headers.h
default: program
program.o: program.c $(HEADERS)
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How does delete[] know it's an array?
...e programmer. Deleting a pointer to a single int with delete [] would result in undefined behavior. Your second main() example is unsafe, even if it doesn't immediately crash.
The compiler does have to keep track of how many objects need to be deleted somehow. It may do this by over-allocating e...
Characters allowed in a URL
...d / sub-delims )
unreserved = ALPHA / DIGIT / "-" / "." / "_" / "~" <---This seems like a practical shortcut, most closely resembling original answer
reserved = gen-delims / sub-delims
gen-delims = ":" / "/" / "?" / "#" / "[" / "]" / "@"
sub-delims = "!" / "$" / "&" / "'" / "(" ...
Resize a large bitmap file to scaled output file on Android
...outWidth + ",
orig-height: " + options.outHeight);
Bitmap resultBitmap = null;
in = mContentResolver.openInputStream(uri);
if (scale > 1) {
scale--;
// scale to max possible inSampleSize that still yields an image
// larger than target
options ...
java.net.ConnectException: localhost/127.0.0.1:8080 - Connection refused
..."
And make sure you did set the internet permission within the manifest
<uses-permission android:name="android.permission.INTERNET" />
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How do I retrieve the number of columns in a Pandas data frame?
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Alternative:
df.shape[1]
(df.shape[0] is the number of rows)
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What is the _references.js used for?
... I didn't even appreciate why I was getting angular intellisense. <3 Visual Studio!
– Dave Alperovich
Apr 3 '14 at 17:50
2
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Rails find_or_create_by more than one attribute?
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Multiple attributes can be connected with an and:
GroupMember.find_or_create_by_member_id_and_group_id(4, 7)
(use find_or_initialize_by if you don't want to save the record right away)
Edit: The above method is deprecated i...