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MongoDB atomic “findOrCreate”: findOne, insert if nonexistent, but do not update
as the title says, I want to perform a find (one) for a document, by _id, and if doesn't exist, have it created, then whether it was found or was created, have it returned in the callback.
...
Environment variables for java installation
...ironment variables (== environment variables of type user variables)
JAVA_HOME : C:\Program Files\Java\jdk1.8.0_112
JDK_HOME : %JAVA_HOME%
JRE_HOME : %JAVA_HOME%\jre
CLASSPATH : .;%JAVA_HOME%\lib;%JAVA_HOME%\jre\lib
PATH : your-unique-entries;%JAVA_HOME%\bin (make sure that the longish your...
Avoid browser popup blockers
...create a blank popup on user action
var importantStuff = window.open('', '_blank');
Optional: add some "waiting" info message. Examples:
a) An external HTML page: replace the above line with
var importantStuff = window.open('http://example.com/waiting.html', '_blank');
b) Text: add the follow...
How to implement a rule engine?
...;
// use a method call, e.g. 'Contains' -> 'u.Tags.Contains(some_tag)'
return Expression.Call(left, method, right);
}
}
Note that I used 'GreaterThan' instead of 'greater_than' etc. - this is because 'GreaterThan' is the .NET name for the operator, therefore we don't need any...
New Array from Index Range Swift
...gt; but is of type ArraySlice<Int>. That's because Array's subscript(_:) returns an ArraySlice<Element> that, according to Apple, presents a view onto the storage of some larger array.
Besides, Swift also provides Array an initializer called init(_:) that allows us to create a new...
How do I catch a numpy warning like it's an exception (not just for testing)?
...gt;>> import numpy as np
>>> np.array([1])/0 #'warn' mode
__main__:1: RuntimeWarning: divide by zero encountered in divide
array([0])
>>> np.seterr(all='print')
{'over': 'warn', 'divide': 'warn', 'invalid': 'warn', 'under': 'ignore'}
>>> np.array([1])/0 #'print' ...
How to configure Git post commit hook
...the git notes 'build' (git show refs/notes/build): git diff --name-only SHA_build HEAD.
your script can parse that list and decide if it needs to go on with the build.
in any case, create/move your git notes 'build' to HEAD.
May 2016: cwhsu points out in the comments the following possible url...
Is there an exponent operator in C#?
...h.Pow() is not an operator an thus has not the same usages as an operator ._.
– Alexandre Daubricourt
Dec 30 '18 at 13:35
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How to parse JSON in Scala using standard Scala classes?
... {
"languages": [{
"name": "English",
"is_active": true,
"completeness": 2.5
}, {
"name": "Latin",
"is_active": false,
"completeness": 0.9
}]
}
""".stripMargin
val result = for {
Some(M(m...
Sort Go map values by keys
... }
sort.Ints(keys)
// To perform the opertion you want
for _, k := range keys {
fmt.Println("Key:", k, "Value:", m[k])
}
}
Output:
Key: 0 Value: b
Key: 1 Value: a
Key: 2 Value: c
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