I have used ‘sanitize’ gem to remove HTML tags from entered text
the version i was using was ‘1.0.8’
After using it for a while, i found an issue in it where calling
Sanitize.clean(“’”) will return “#39;” while quote isn’t HTML character
Looking around for a reason for this issue, i found that this is a defect that was detected in older versions and that it is now fixed in version ‘1.1.0’
So anyone who has this issue can simply remove his installed gem and install the latest one
This title was part of an error message i got while dealing with action_mailer
i looked everywhere for a reason for this error message and found so many reasons but none of them matched with my case
So i liked to share why i got this error. Simply because i was adding no recipients to my email. I know it is very weird to send an email without having a recipient but getting this error message i much more weird and strange
/usr/lib/ruby/1.8/net/smtp.rb:930:in `check_response': 555 5.5.2 Syntax error. 24sm123817eyx.21 (Net::SMTPFatalError)
from /usr/lib/ruby/1.8/net/smtp.rb:899:in `getok'
from /usr/lib/ruby/1.8/net/smtp.rb:842:in `rcptto'
from /usr/lib/ruby/1.8/net/smtp.rb:834:in `rcptto_list'
from /usr/lib/ruby/1.8/net/smtp.rb:833:in `each'
from /usr/lib/ruby/1.8/net/smtp.rb:833:in `rcptto_list'
from /usr/lib/ruby/1.8/net/smtp.rb:654:in `sendmail'
from /usr/lib/ruby/gems/1.8/gems/actionmailer-2.3.2/lib/action_mailer/base.rb:683:in `perform_delivery_smtp'
from /usr/lib/ruby/1.8/net/smtp.rb:526:in `start'
from /usr/lib/ruby/gems/1.8/gems/actionmailer-2.3.2/lib/action_mailer/base.rb:681:in `perform_delivery_smtp'
from /usr/lib/ruby/gems/1.8/gems/actionmailer-2.3.2/lib/action_mailer/base.rb:523:in `__send__'
from /usr/lib/ruby/gems/1.8/gems/actionmailer-2.3.2/lib/action_mailer/base.rb:523:in `deliver!'
from /usr/lib/ruby/gems/1.8/gems/actionmailer-2.3.2/lib/action_mailer/base.rb:395:in `method_missing'
from test_sending_emails_in_ruby.rb:31
this is the error message i got and it was solved when i added a recipient
I was working on a task that scrape several web pages. After running this task for a while, i found that memory taken by my process is raising forever until it was about to eat all memory available of the server.
after some investigation regarding this matter, i knew that the problem was in my understanding to how mechanize agent works
let me explain with an example
agent = WWW::Mechanize.new
while(true)
page = agent.get(“www.example.com”)
end
in this example, memory will be consumed because mechanize keeps history within the agent, i looked in its documentation and found that there is a parameter which is called “max_history” which when set will fix this issue i think but didn’t try
also a fix to such issue, if you don’t need history is to write your code like that
while(true)
agent = WWW::Mechanize.new
page = agent.get(“www.example.com”)
end
That’s it, maybe this piece of information can be useful for someone facing this issue just like me
Installing mechanize gem on Debian should be as easy as running this command
gem install mechanize
but this won’t succeed unless you install these packages on your Debian machine
apt-get install libxml-dev libxslt1-dev
Once installed, gem will be installed seamlessly
Update:
if the above apt-get command didn't work with you and you got an error that package doesn't exist
try this new line
apt-get install libxml2-dev libxslt1-dev
as some packages names has changed
Due to my new configuration which is using Windows as my default OS and Debian shell through Virtualbox, my need to have a folder shared between these two environment become a must in order to ease file sharing and exchange.
At first, i depended on “shared folders” feature of VirtualBox which after a while failed as i always get a “Protocol Error” whenever i deal with files IO on that shared folder.
That’s why i looked for another solution that is more stable than that one and reached to using “CIFS” as a way to mount windows shared folder on my Debian machine.
The steps are very easy to be made and gives you a stable robust solution away from VirtualBox problems. i can summarize these steps as follows
That’s it, Enjoy sharing folders seamlessly
Two giants are there one called Windows and another called Linux. As i am fan of Windows Interfaces and Usability (by the way i use Windows XP) and also fan of the extreme shell power of Linux, I wished if i can exploit these two powers at the same time.
The solution i found was using Windows XP as my primary OS and adding Debian version on virtual machine. You may be asking why should this solution be said when it is well known and made by some many users but actually, i made some modifications to this solution.
What i did can be summarized in these following points:
This way, i enjoy my XP machine and whenever i need the shell of linux. i connect using openssh on my debian virtualized machine and do what i want
I use this solution while developing ROR applications, i prepared the environment i use as follows
Now, i open my IDE on XP machine that changes in folders place in the shared folder between two machines and i open my server from virtual machine and test apps on debian machine IP rather than my localhost
This experience is great and i enjoy it so much as i feel i have the power of each environment Windows & Linux at the same time
In order to optimize the performance of my Virtual Machine somehow, i raised the priority of these virtualized processes to ‘High’ or even ‘Realtime’. it is now better but not perfect
I think in order to raise the performance significantly, i need to buy another motherboard supporting Intel VT technology. Using such technology i can move virtualization from software layer (being a process that Windows XP Scheduler deal with) to hardware layer which should improve performance as stated
That’s it, i suggest you try this experience and Enjoy as i do
the idea is simple and only needed is that you do some simple steps and you are done
follow the following steps:
That’s it, you now have the document you wrote in WIKI style. Take this text and play with it as you wish
