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How do I get the current absolute URL in Ruby on Rails?
... in other parameters
# https://x.com/y/1?page=1
# + current_url( :page => 3 )
# = https://x.com/y/1?page=3
def current_url(overwrite={})
url_for :only_path => false, :params => params.merge(overwrite)
end
Example Usage:
current_url --> http://...
current_url(:page=>4) --> ...
How to use GROUP BY to concatenate strings in MySQL?
...ASC | DESC] [,col_name ...]]
[SEPARATOR str_val])
OR
mysql> SELECT student_name,
-> GROUP_CONCAT(DISTINCT test_score
-> ORDER BY test_score DESC SEPARATOR ' ')
-> FROM student
-> GROUP BY student_name;
...
Is there a foreach in MATLAB? If so, how does it behave if the underlying data changes?
...et the value of the loop variable(s) as you wish:
n = 10;
f = n;
while n > 1
n = n-1;
f = f*n;
end
disp(['n! = ' num2str(f)])
Btw, the for-each loop in Java (and possibly other languages) produces unspecified behavior when the data structure is modified during iteration. If you need to...
EC2 Can't resize volume after increasing size
...untu from 8G up to 16G "on-the-fly".
step-1) login into AWS web console -> EBS -> right mouse click on the one you wish to resize -> "Modify Volume" -> change "Size" field and click [Modify] button
step-2) ssh into the instance and resize the partition:
let's list block devic...
What is an undefined reference/unresolved external symbol error and how do I fix it?
...returned 1 exit status
and similar errors with Microsoft Visual Studio:
1>test2.obj : error LNK2001: unresolved external symbol "void __cdecl foo(void)" (?foo@@YAXXZ)
1>test2.obj : error LNK2001: unresolved external symbol "int x" (?x@@3HA)
1>test2.obj : error LNK2001: unresolved external ...
How would you access Object properties from within an object method? [closed]
...c function getName($outsideCall = true){ if($outsideCall){ $this->incrementNameCalled(); } return $this->name; } and then from within the Object itself, if you called get name, you could keep it from incrementing by: PHP: $name = $this->getName(false); Am I just going over...
Deprecated warning for Rails 4 has_many with order
...ch as dependent: :destroy etc.
Give this a try:
has_many :contents, -> { order(:position) }
To specify order direction, i.e. either asc or desc as @joshua-coady and @wsprujit have suggested, use:
has_many :contents, -> { order 'position desc' }
or, using the hash style:
has_many :...
Folder is locked and I can't unlock it
...click on your Subversion working directory folder, and select TortoiseSVN->Clean Up from the Context Menu. This will recurse it's way through your working directory and cleanup any incomplete actions, remove the local locks (which is different from using Subversion locking of a file in the reposi...
Permission denied (publickey) when deploying heroku code. fatal: The remote end hung up unexpectedly
...H2_MSG_KEXINIT sent
debug1: SSH2_MSG_KEXINIT received
debug1: kex: server->client aes128-cbc hmac-md5 none
debug1: kex: client->server aes128-cbc hmac-md5 none
debug1: sending SSH2_MSG_KEXDH_INIT
debug1: expecting SSH2_MSG_KEXDH_REPLY
debug1: Host 'heroku.com' is known and matches the RSA host...
Replace String in all files in Eclipse
...
"Search"->"File"
Enter text, file pattern and projects
"Replace"
Enter new text
Voilà...
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