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What do helper and helper_method do?
... This is used for any method that you need to access from both controllers and helpers/views (standard helper methods are not available in controllers). e.g. common use case:
#application_controller.rb
def current_user
@current_user ||= User.find_by_id!(session[:user_id])
end
helper_method :curre...
Linux: compute a single hash for a given folder & contents?
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If there is a whole directory tree, you're probably better off using find and xargs. One possible command would be
find path/to/folder -type f -print0 | sort -z | xargs -0 sha1sum | sha1sum
And, finally, if you also need to take account of permissions and empty directories:
(find path/to/folde...
How do I change column default value in PostgreSQL?
...able name, only that table is altered. If ONLY is not specified, the table and all its descendant tables (if any) are altered" postgresql.org/docs/9.3/static/sql-altertable.html
– Yodan Tauber
Dec 20 '15 at 8:41
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Scala: join an iterable of strings
...Strings.mkString(",")
A variant exists in which you can specify a prefix and suffix too.
See here for an implementation using foldLeft, which is much more verbose, but perhaps worth looking at for education's sake.
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How to create loading dialogs in Android?
Those dark spinning progress dialogs in the Amazon and Engadget apps - are those standard in Android?
2 Answers
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Include all files in a folder in a single bundle
...include all files of a folder including all the files of the childfolders (and their childfolders etc.)?
1 Answer
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What is float in Java?
...f it is suffixed with an ASCII letter F or f; otherwise its type is double and it can optionally be suffixed with an ASCII letter D or d
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Can you put two conditions in an xslt test attribute?
Is this right for When 4 < 5 and 1 < 2 ?
4 Answers
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PHP namespaces and “use”
I am having a little trouble with namespaces and the use statements.
2 Answers
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Remove data.frame row names when using xtable
OK, I admit this one is a bit uptight (read: "stupid"), and I assume it's quite easy too. I'm writing a report and I want to use xtable package for LaTeX table generation (note that memisc package does the job, but say I want to do this solely with xtable ).
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