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How can I list all collections in the MongoDB shell?
... Can we please get db.listCollections() as the answer shown here and checked in green? Otherwise people are making the same mistake I did countless times when they come to this answer - and attempt to use db.getCollectionNames and the error comes back db.collectionNames is not a function....
How do I read the source code of shell commands?
I would like to read the actual source code which the linux commands are written with. I've gained some experience using them and now I think it's time to interact with my machine at a deeper level.
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“Ago” date/time functions in Ruby/Rails
...om_time, to_time)
time_ago_in_words(from_time)
Check the API for details and more options.
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Reading InputStream as UTF-8
...edReader in = new BufferedReader(new InputStreamReader(url.openStream(), StandardCharsets.UTF_8));
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Left padding a String with Zeros [duplicate]
I've seen similar questions here and here .
20 Answers
20
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How to check if an int is a null
.... you need to do
if (person != null){ // checks if person is not null
}
and
if(person.equals(null))
The above code would throw NullPointerException when person is null.
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Rails 4 Authenticity Token
...fault, \Rails resets the session when it finds an unverified request.
def handle_unverified_request
reset_session
end
In Rails 4:
def handle_unverified_request
forgery_protection_strategy.new(self).handle_unverified_request
end
Which will call the following:
def handle_unverified_request
...
Remove multiple elements from array in Javascript/jQuery
...removeValFromIndex[i],1);
Go through removeValFromIndex in reverse order and you can .splice() without messing up the indexes of the yet-to-be-removed items.
Note in the above I've used the array-literal syntax with square brackets to declare the two arrays. This is the recommended syntax because...
How can I create an error 404 in PHP?
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What you're doing will work, and the browser will receive a 404 code. What it won't do is display the "not found" page that you might be expecting, e.g.:
Not Found
The requested URL /test.php was not found on this server.
That's because the web server...
CSS Input Type Selectors - Possible to have an “or” or “not” syntax?
...syntax. At the time this question was asked, we needed a fall-back for IE7 and IE8. One option was to use a polyfill like IE9.js. Another was to exploit the cascade in CSS:
input {
// styles for most inputs
}
input[type=checkbox] {
// revert back to the original style
}
input.checkbox {
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