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Rails: around_* callbacks
...read the documentation at http://api.rubyonrails.org/classes/ActiveRecord/Callbacks.html , but don't understand when the around_* callbacks are triggered in relation to before_* and after_* .
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What command opens Ruby's REPL?
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There are several REPLs for Ruby.
The standard library ships with a REPL called IRb (for Interactive Ruby), which installs a program named irb, but since it is just a Ruby library, it can also be invoked from Ruby code and not just from the shell. On Rubinius, IRb can also be invoked by just calli...
Reset PHP Array Index
...t:
$a = array(
3 => "Hello",
7 => "Moo",
45 => "America"
);
$b = array_values($a);
print_r($b);
Array
(
[0] => Hello
[1] => Moo
[2] => America
)
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What's the difference between MemoryCache.Add and MemoryCache.Set?
... thread querying that key would get no clue (Set does not; the swap is typically atomic); as such, while Set has the same end result as Remove + Add, the mechanism difference is important since it could impact other callers.
For example of Add:
Return Value
Type: System.Boolean true if ins...
How set the default repository
How can I set default remote repository for mercurial local repository?
1 Answer
1
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Clojure 1.2.1/1.3/1.4 'proxy generated in Grails 2.0.0 runtime fails. 1.2.0 is fine
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I found an Issue called CLJ-944 on clojure.org. There you can find a fix for ClassCastException: clojure.lang.PersistentArrayMap cannot be cast to java.lang.Class issue
The problem is:
that the compiler injects an incorrect cast to
clo...
Oracle SQL Developer multiple table views
In Oracle SQL Developer , one can list the data in a table using the Data tab when viewing a table. there where can add, delete, edit or just viewing records of table currently viewd
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SQL: How to get the count of each distinct value in a column?
I have a SQL table called "posts" that looks like this:
1 Answer
1
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Reliable timer in a console application
...amework Class Library ). I have chosen a threaded timer as the other types can drift if the main thread is busy, and I need this to be reliable.
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emacs, unsplit a particular window split
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You can use the C-x0 key combination to delete the current window.
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