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How do I test a file upload in rails?
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From The Rspec Book, B13.0:
Rails’ provides an ActionController::TestUploadedFile class which can be used to represent an uploaded file in the params hash of a controller spec, like this:
describe UsersController, "POST c...
How do you grep a file and get the next 5 lines
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You want:
grep -A 5 '19:55' file
From man grep:
Context Line Control
-A NUM, --after-context=NUM
Print NUM lines of trailing context after matching lines.
Places a line containing a gup separator (described under --group-separator)
between contiguous g...
Get ID of last inserted document in a mongoDB w/ Java driver
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To avoid casting from Object to ObjectId, given a com.mongodb.client.MongoCollection collection and a org.bson.Document doc, you can do the following:
collection.insert(doc);
ObjectId id = doc.getObjectId("_id");
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Converting A String To Hexadecimal In Java
...the most pure sample of 3vilness I ever saw: using a BigInteger to convert from a byte[]...
– Eduardo Costa
Jul 5 '11 at 21:07
13
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Efficient way to determine number of digits in an integer
...ng a uniform distribution of numbers, the reverse linear search ( starting from max digits to 1 ) may be faster on average than the binary search as there are quite more numbers with N digits than with N-1 digits graphics.stanford.edu/~seander/…
– fa.
Sep 2...
Switch statement fall-through…should it be allowed? [closed]
...sider that evil. Perhaps moving the common code to a function and calling from both places would be a better idea.
And please note that I use the C++ FAQ definition of "evil"
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What parameters should I use in a Google Maps URL to go to a lat-lon?
...tion for a long time and I found the perfect one. here are some parameters from it.
https://maps.google.com?parameter = value
q=
is used to specify the search query in Google maps search.
eg :
https://maps.google.com?q=newyork or
https://maps.google.com?q=51.03841,-114.01679
near=
is used ...
How to use CSS to surround a number with a circle?
...eed the zero width space for vertical alignment. Moved the line-height:0px from the outer to the pseudo so that it is at least visible when degrading for IE8.
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How can I pad a value with leading zeros?
...xity when commented. This means you understand that there are perspectives from which your answer is not perfect. Hence the complexity.
– Om Shankar
Aug 8 '15 at 7:49
3
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Arduino101 引脚 · App Inventor 2 中文网
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Parameters:
* value (_number_) —
The value of the pin read from the Arduino. Valid values depend on whether the pin
is digital or analog. For digital pins, a 0 indicates LOW and 1 indicates HIGH.
For analog, an integer in the range of [0, 1023] will be returned.
PinStateWr...