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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.
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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...
How to get disk capacity and free space of remote computer
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$disk = Get-WmiObject Win32_LogicalDisk -ComputerName remotecomputer -Filter "DeviceID='C:'" |
Select-Object Size,FreeSpace
$disk.Size
$disk.FreeSpace
To extract the values only and assign them to a variable:
$disk = Get-WmiObject Win32_LogicalDisk...
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 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...
What does the regular expression /_/g mean?
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The regex matches the _ character.
The g means Global, and causes the replace call to replace all matches, not just the first one.
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impro...
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' ...
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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Rails raw SQL example
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You can do this:
sql = "Select * from ... your sql query here"
records_array = ActiveRecord::Base.connection.execute(sql)
records_array would then be the result of your sql query in an array which you can iterate through.
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sbt-assembly: deduplication found error
...le
assemblyMergeStrategy in assembly := {
case PathList("META-INF", xs @ _*) => MergeStrategy.discard
case x => MergeStrategy.first
}
This helped me a lot.
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