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Validate uniqueness of multiple columns
... can pass multiple scope params in case you need to validate uniqueness on more than 2 fields. I.e. :scope => [:friend_id, :group_id]
– Dave Rapin
May 2 '11 at 16:36
27
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How do I use Nant/Ant naming patterns?
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The rules are:
a single star (*) matches zero or more characters within a path name
a double star (**) matches zero or more characters across directory levels
a question mark (?) matches exactly one character within a path name
Another way to think about it is double star...
How to export data as CSV format from SQL Server using sqlcmd?
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This answer is now outdated. PowerShell scripts are more flexible and can be run in SQL Server as a Job Agent.
– Clinton Ward
May 24 '16 at 2:45
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How to get file creation & modification date/times in Python?
... spent a few hours researching in the process), and I'm sure it's at least more correct than the answers that were here previously, but this is a really hard topic and I'd appreciate any corrections, clarifications, or other input that people can offer. In particular, I'd like to construct a way of ...
Any free WPF themes? [closed]
...lex community or something for this. Heck, it is amazing that there aren't more for purchase!
The only one that I have found (for sale) is reuxables. A little pricey, if you ask me, but you do get 9 themes/61 variations.
UPDATE 1:
After I posted my answer, I thought, heck, I should go see if any Cod...
Why I can't change directories using “cd”?
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Functions are more flexible than aliases, so that's where you'd look next when aliases aren't enough.
– ephemient
Nov 1 '08 at 4:40
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What is the best way to ensure only one instance of a Bash script is running? [duplicate]
...; /bin/rm -f /var/run/my.lock" 0 1 2 3 13 15 You can search /usr/bin/* for more examples.
– Shannon Nelson
Nov 12 '09 at 4:07
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Are static variables shared between threads?
...o visibility. If they are accessible any thread can get at them, so you're more likely to see concurrency problems because they're more exposed.
There is a visibility issue imposed by the JVM's memory model. Here's an article talking about the memory model and how writes become visible to threads. Y...
Scala: What is a TypeTag and how do I use it?
...peTags#WeakTypeTag
ClassTag substitutes ClassManifest whereas TypeTag is more or less the replacement for Manifest.
The former allows to fully work with generic arrays:
scala> import scala.reflect._
import scala.reflect._
scala> def createArr[A](seq: A*) = Array[A](seq: _*)
<console&gt...
How do you stop tracking a remote branch in Git?
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@GabrielStaples I agree. For more on remote tracking: stackoverflow.com/a/44081446/6309, stackoverflow.com/a/38202006/6309 and stackoverflow.com/a/28341622/6309
– VonC
Sep 6 at 9:24
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