Wed 14 Apr 2010
Posted by kosmas under ruby on rails
No Comments
Problem
You have the error showing up after starting either the server (./script/server) or the console (./script/console).
For my particular case it started appearing after installing the Rails 3.0 beta3 version, and in an application developed with Rails 2.3.2.
Solution
Just install the system_timer gem:
sudo gem install system_timer
Fri 26 Mar 2010
Posted by kosmas under Mandriva, linux, ruby on rails
No Comments
Problem
When you get the above error you cannot login to your application.
Solution
You will need to delete the cookies for the authentication, so in Firefox (Linux) go to Preferences, remove individual cookies for the specific domain.
Thu 18 Mar 2010
Posted by kosmas under Dreamhost, linux, ruby on rails
No Comments
Problem
You have just deployed your rails application to dreamhost but you are getting this error from passenger.
Solution
There was a change in the ImageMagic between versions 6.4.3 and 6.4.4 from the affinity function to remap.
If you don’t want, or don’t have time to recompile the ImageMagick and install the rmagick gem, you can comment out the two declarations for the alias functions, located around lines 782 and 1525 in the file rmagick-2.12.2/lib/RMagick.rb:
alias_method :affinity, :remap
Mon 15 Mar 2010
Posted by kosmas under Dreamhost, ruby on rails
No Comments
Problem
You want to deploy to a shared host (dreamhost) that has a later version of rails from the one you have developed your application.
You also have a later version installed in your development pc,and using rake rails:freeze:gems uses the latest one and not the one you want.
Solution
Use the following to freeze the specific version you want, and by using your gems you have installed:
rake rails:freeze:gems VERSION=2.3.2
Fri 12 Mar 2010
Posted by kosmas under Dreamhost, git, linux
No Comments
Problem
You already have a project in github, but you want to move it to a different host (ie dreamhost)
Solution
Following the post here that describes how to setup a new git repository in dreamhost, the only difference after the initial setup :
ssh username@dreamhost_domain.com
mkdir -p ~/git/yourproject.git
cd ~/git/yourproject.git
git –bare init
is to edit your project’s .git/config file:
vi local_host/your_project/.git/config
and change the :
url = git@github.com:user_name/project_name.git
to the following:
ssh://dreamhost_username@dreamhost_domain/~/git/yourproject.git
Lastly you have to push for the first time to the server:
git push origin master
Optionally if you would like to check and/or checkout to a different pc you can use:
git clone ssh://dreamhost_username@dreamhost_domain/~/git/yourproject.git
Thu 11 Mar 2010
Posted by kosmas under Mandriva, linux
No Comments
Problem
Just recently installed Mandriva 2010 in a new Dell Vostro 430 and the network card (Broadcom Netlink BCM57780) was not recognized.
Solution
Add the following to the /etc/modprobe.conf file:
sudo vi /etc/modprobe.conf
install tg3 /sbin/modprobe broadcom; /sbin/modprobe/ –ignore-install tg3
Tue 23 Feb 2010
Posted by kosmas under ruby on rails
[2] Comments
Problem
You have a list, usually after using join(“,”) in an array that consists of different values ie “one, two, three, four”, but you want to replace the last comma with and so it would be “one, two, three and four”.
Solution
Use reverse initially to reverse the string, then use sub to replace the last comma with the word and reversed (dna), and then finally reverse the string again.
string_with_and=string_with_commas.reverse.sub(/,/, ‘ dna ‘).reverse
or, thanks to Akhil's comment, for Arrays in Rails we can use the to_sentence method as in: string_with_no_commas=array.to_sentence(options = {:last_word_connector => ” and “})
Wed 6 Jan 2010
Posted by kosmas under ruby on rails
No Comments
Problem
Trying to use the rake task for populating latitude and longitude details for addresses as described in the Web mashup projects book, gives the error about attempting to call private method.
Solution
Use the method save instead of update as suggested in the book.
Wed 6 Jan 2010
Posted by kosmas under ruby on rails
No Comments
Problem
Using the latest version of Geokit gives the error for undefined method ‘timeout’. This could happen if the gem/plugin didn’t modify the config/environment.rb file, and you had to copy the configuration values from an older version.
Solution
The configuration variable has changed in the latest version (1.5.0) from timeout to request_timeout, so change it in your config/environment.rb file as :
GeoKit::Geocoders::request_timeout = 3
Tue 5 Jan 2010
Posted by kosmas under MySQL, ruby on rails
No Comments
Problem
You want to use flexigrid with a MySQL fields that contains carriage returns. As the flexigrid uses json it doesn’t work with carriage returns, and displays an empty page, instead of an error page.
Solution
In the page_name.json.erb file in the fields that has carriage returns make sure that you use to_json method as in the example below:
‘<%=fg_escape event.comments.to_json -%>‘,