Thu 18 Aug 2011

SL4Ar4 crashing after installation

Posted by kosmas under Android
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Problem
After installing SL4A_r4 (Scripting Layer for Android), on your Android phone, and before installing any interpreters every time you start your SL4A app, it keeps crashing after a few seconds.

Solution
If you install an interpreter (ie JRuby), then the application stops crashing.
You would need to be quick to start the installation before the application crashes, by doing the following:

Settings -> View -> Interpreters -> Settings -> Add and then select the interpreter you would like.

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Mon 15 Aug 2011

/lib/libz.so.1: no version information available

Posted by kosmas under Android
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Problem
You are following the steps described in the book ‘Hello, Android’, but when you try to change the interface in section 3.3 ‘Creating the Opening Screen’, and try to run the application in either the emulator or the phone you get the following error message in the eclipse console:
/lib/libz.so.1: no version information available...

Solution
You will need to make sure that you add the needed strings, i.e (main_title, continue_label, new_game_label, about_label and exit_label) in the Sudoku/values/strings.xml file, which is described in page 51, but is not clear that you have to do that before running the app. So your strings.xml file should look like:

<?xml version="1.0" encoding="utf-8"?>
<resources>
<string name="app_name">Sudoku</string>
<string name="main_title">Android Sudoku</string>
<string name="continue_label">Continue</string>
<string name="new_game_label">New Game</string>
<string name="about_label">About</string>
<string name="exit_label">Exit</string>
</resources>

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Fri 22 Jul 2011

Testing associations in Rspec

Posted by kosmas under RSpec, ruby on rails
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Problem
You would like to test your model associations in an RSpec model spec, to make sure that they are correctly set up.

Solution
After some Google searching and coming across this article here, ended up using the second method described there with the reflect_on_association method, as it doesn’t need the inclusion of another gem.
So for example to to test multiple has_many or belongs_to associations in your model rspec you could use something like:
context "check associations" do
# belongs_to associations
%w{bel_to1 bel_to2}.each do |bt|
it "should belong to #{bt}" do
m = Model.reflect_on_association(:"#{bt}")
m.macro.should == :belongs_to
end
end
# has_many associations
%w{has_many1 has_many2 has_many3}.each do |hm|
it "should have many #{hm}" do
m = Model.reflect_on_association(:"#{hm}")
m.macro.should == :has_many
end
end
end

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Fri 22 Jul 2011

The single-table inheritance mechanism failed to locate the subclass:

Posted by kosmas under Cucumber, ruby on rails
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Problem
You have correctly setup your Single Table Inheritance tables as in:

class Parent < ActieRecord::Base ; end
class Child < Parent ; end

but everytime you are trying to use that in a cucumber feature, or in rails console you get the following error:

The single-table inheritance mechanism failed to locate the subclass: 'child'. This error is raised because the column 'type' is reserved for storing the class in case of inheritance. Please rename this column if you didn't intend it to be used for storing the inheritance class or overwrite Parent.inheritance_column to use another column for that information. (ActiveRecord::SubclassNotFound)

Solution
Make sure that when use the subclass name in a feature, or you create a record in the database the initial letter is in capital!
So make sure that in this case the type column contains 'Child' and not 'child'

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Tue 19 Jul 2011

Google-Maps-Rails (gmaps4rails) does not display markers when upgrading to 0.10.0

Posted by kosmas under ruby on rails
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Problem
When upgrading the gmaps4rails gem to version 0.10.0 the markers are not displayed any more on the map.

Solution
There is an issue raised about the bug here.
To make the markers appear downgrade to version 0.9.1 of the gem.

update: or upgrade to 0.10.2 as the bug is fixed.

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Wed 13 Jul 2011

Error while loading shared libraries – Mandriva

Posted by kosmas under linux, Mandriva
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Problem
After installing a package and trying to run it in Mandriva 2010 64, you get errors about missing libraries, like:

error while loading shared libraries: libasound.so.2: cannot open shared object file: No such file or directory

Solution
Use the urpmf command to find the packages that contain the missing libraries like :

urpmf libasound.so.2

and then when you get something like the following:

lib64alsa2:/usr/lib64/libasound.so.2
lib64alsa2:/usr/lib64/libasound.so.2.0.0
lib64alsa2:/usr/lib64/libasound.so.2
lib64alsa2:/usr/lib64/libasound.so.2.0.0
libalsa2:/usr/lib/libasound.so.2
libalsa2:/usr/lib/libasound.so.2.0.0
libalsa2:/usr/lib/libasound.so.2
libalsa2:/usr/lib/libasound.so.2.0.0

install the missing packages with:

sudo urpmi lib64alsa2
or/and
sudo urpmi libalsa2

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Tue 12 Jul 2011

Using gitolite in a non standard ssh port

Posted by kosmas under git
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Problem
You have moved your gitolite server or you want to be able to access your gitolite server behind a firewall and port 22 for ssh is no longer available.

Solution
Edit your .git/config file and replace the line with :

url = git_user_name@http://server_ip:repo_name.git

to the following:

url = ssh://git_user_name@external_ip:non_standard_ssh_port/repo_name.git

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Fri 8 Jul 2011

OSx – VMware – Mandriva resizing partition

Posted by kosmas under linux, Mandriva
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Problem
When you use WMware to run Mandriva or any other distribution on Mac OSx, if you resize the hard disk partition in VMware your Mandriva system won’t automatically resize the partition to use the newly available space.

Solution
To be able to use the available space the quickest solution is:

  • restart your VMware session but run in safe mode
  • start up drakdisk
  • select the partition you want to resize. WARNING (Make sure you back up important data – even though in my case everything went smoothly)
  • umount the select partition and resize using all the avaliable free space
  • after a few minutes you should be able to restart your VMware and login to your virtual machine as normal, and the partition should be resized

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Mon 27 Jun 2011

problem using capistrano on deployment server after server ip address change

Posted by kosmas under Capistrano, git, linux
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Problem
After changing the IP address of your staging server the cap deploy does not work any more and gives you the following error:

** [192.168.0.50 :: err] Host key verification failed.
** [192.168.0.50 :: err] fatal: The remote end hung up unexpectedly

Solution
You would need to login to your staging server (as your deployment user) and do an initial checkout for one time for the ssh keys to work.
So you could do something like the following:

$ ssh user_name@staging_server
$sh -c 'git clone -q git_user@192.168.0.50:repo_name /some/tmp/dir/temp_repo_name

Make sure that you reply ‘y’ to the question about the authenticity of the host as in:
The authenticity of host '192.168.0.50 (192.168.0.50)' can't be established.
RSA key fingerprint is xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xxb.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added '192.168.0.50' (RSA) to the list of known hosts.

Net delete the newly created git project from your tmp directory, and then you should be able to use cap deploy as normal again from your development pc

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Mon 27 Jun 2011

You tried to assign a String or a Pathname to an uploader, for security reasons, this is not allowed.

Posted by kosmas under factory_girl, linux, ruby on rails
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Problem
You would like to use Carrierwave for file uploads, but you get the following error if you are trying to use factories for running your cucumber scripts:

You tried to assign a String or a Pathname to an uploader, for security reasons, this is not allowed.

That happens if you try to assign inside your factory template, to your file field the path like f.file “path_to_file”

Solution

You would need to slightly modify your factory template to use the file path as follows:

f.file File.open(File.join(Rails.root,"path_to_file"))

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