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In mongoDb, how do you remove an array element by its index?
...}})
db.lists.update({}, {$pull : {"interests" : null}})
Update: as mentioned in some of the comments this approach is not atomic and can cause some race conditions if other clients read and/or write between the two operations. If we need the operation to be atomic, we could:
Read the document f...
How to get the clicked link's href with jquery?
Does anyone know how can I get the clicked link's href with jquery? I have the link as following:
4 Answers
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How to solve the “failed to lazily initialize a collection of role” Hibernate exception
...ime you retrieve a Topic then change your field mapping for comments to:
@OneToMany(fetch = FetchType.EAGER, mappedBy = "topic", cascade = CascadeType.ALL)
private Collection<Comment> comments = new LinkedHashSet<Comment>();
Collections are lazy-loaded by default, take a look at this ...
How to call a Parent Class's method from Child Class in Python?
...ass's method in Python", and the OP is written from the perspective of someone new to python.
I found:
https://docs.python.org/3/tutorial/classes.html#inheritance
to be useful in understanding how you access inherited methods.
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How can I get color-int from color resource?
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hmm... this is what everyone says but i can't get it to work. Do i have to initialize context? Currently I get "cannot resolve symbol 'context'"
– ColdTuna
Sep 27 '17 at 18:06
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How to use mod operator in bash?
...or i in {1..600}; do echo wget http://example.com/search/link$(($i % 5)); done
The $(( )) syntax does an arithmetic evaluation of the contents.
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Python unit test with base and sub class
...ommonTests. I think the setUpClass method below is the best and is less prone to human error. Either that or wrapping the BaseTest class in a container class which is a bit more hacky but avoids the skip message in the test run printout.
– David Sanders
Oct 1...
How to set data attributes in HTML elements
... works. may be we can edit the answer to make it clear. it seems the first one is the solution, while it could be a little bit better exposed. i'm not sure about how to better explain, this is the reason why I don't edit the post.
– Gaucho
Nov 2 '18 at 11:58
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How to convert a LocalDate to an Instant?
...oint on the time-line. Conversion to and from a LocalDate requires a time-zone. Unlike some other date and time libraries, JSR-310 will not select the time-zone for you automatically, so you must provide it.
LocalDate date = LocalDate.now();
Instant instant = date.atStartOfDay(ZoneId.systemDefault(...
write a shell script to ssh to a remote machine and execute commands
...mmands in each machine. (Including some sudo operations). How can this be done using shell scripting?
You can do this with ssh, for example:
#!/bin/bash
USERNAME=someUser
HOSTS="host1 host2 host3"
SCRIPT="pwd; ls"
for HOSTNAME in ${HOSTS} ; do
ssh -l ${USERNAME} ${HOSTNAME} "${SCRIPT}"
done
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