JetThoughts' articles

Change Factory Girl directory path for Rails 3 generator

2011-09-24T00:00:00Z

After setup rails 3.1 + Rspec + FactoryGirl, all factories are generated to test/factories instead spec/factories. Solution is to add to your application.rb:

g.fixture_replacement :factory_girl, :dir => 'spec/factories'

So we have:

:::ruby
config.generators do |g|
  g.template_engine :haml
  g.test_framework :rspec, :fixture_replacement => :factory_girl, :views => false, :helper => false
  g.view_specs false
  g.helper_specs false
  g.fixture_replacement :factory_girl, :dir => 'spec/factories'
end

Add current date to text document

2011-04-04T00:00:00Z

Often we need to add current date to text document. For Mac users we have awesome tools as Automator and AppleScript. We need to do five simple steps:

1) Create a new workflow with template “Service” in Automator

2) Choose ‘Service receives’ to “no input” in “any application”

3) Add action “Run AppleScript” with content:

:::shell
on run {input, parameters}
  tell application "System Events"
    keystroke (short date string of (current date))
  end tell
  return input
end run

4) Save the service

5) Go To “System Preferences –> Keyboard –> Keyboard Shortcuts –> Services” and setup a shortcut for the service and enable it.

Allow multiple access control requests for Rails

2010-12-22T00:00:00Z

If you have problem with sending XHR requests from different domains, you find trouble to get content, because

XMLHttpRequest cannot load http://different.domain.local:3000/visits. Origin http://localhost:3000 is not allowed by Access-Control-Allow-Origin.

The solution is to setup response headers: Access-Control-Request-Method, Access-Control-Allow-Origin.

:::ruby
headers['Access-Control-Allow-Origin'] = '*'
headers['Access-Control-Request-Method'] = '*'

Example for rails:

:::ruby
#app/application_controller.rb
after_filter :set_access_control_headers

def set_access_control_headers
  headers['Access-Control-Allow-Origin'] = '*'
  headers['Access-Control-Request-Method'] = '*'
end

Redis Store to store session

2010-09-28T00:00:00Z

I use Redis to store session and cache. And When I try cache some session values, I get exception “TypeError (can’t dump TCPSocket)”. I have researched this trouble. It was because session.slice(‘keys’) return not simple Hash instance, but SessionHash. So instance method to_hash fix all troubles. Example:

:::ruby
Rails.cache.write("key", session.except("flash", :session_id, :_csrf_token))

Solution:

:::ruby
Rails.cache.write("key", session.except("flash", :session_id, :_csrf_token).to_hash)

Show not valid CSV lines with sed

2010-09-21T00:00:00Z

I have trouble with invalid formatted CSV file. First step show lines with invalid lines.

:::sh
sed -n '/"[^",]*"[^",]*"[^",]*",/,1p' <fileName>

Then find in the google way to replace symbol inside quotes. And read next manual http://sed.sourceforge.net/sed1line.txt. So create a sed script with next content, call it as script.sed:

:::sh
s/\",\"/\$XXXX\$/g;
:a
s/\([^,]\)"\([^,]\)/\1'\2/g
ta
s/\$XXXX\$/\",\"/g;

Next we just do:

:::sh
sed -f script.sed <fileName>

And we get in output a normal csv format file. Next we just add the argument to apply this in this file.

:::sh
sed -i .bak -f script.sed <fileName>

Different timestamp for Rails and Postgres

2010-09-16T00:00:00Z

Today I found a discrepancy in Rails timestamp and Postgres timestamp for my specs:

:::ruby
puts Time.now.to_i
puts ActiveRecord::Base.connection.execute("SELECT LOCALTIMESTAMP as c1")[0]["c1"].to_time(:local).to_i

But for console timestamps are the same. Why it is not working for specs, I dont know.

Remove first lines from stream

2010-09-04T00:00:00Z

I am not a linux hacker, so I wasted a lot of time to find solution to strip first lines from output stream. First my solution was:

:::sh
tail -f some_file | ruby -e 'a =0; while t=gets; a+=1; puts t if a > 1; end'

It is looks very long, and I thought that this problem is very popular, and at least one tool already exist in the world.

I knew a tool sed and used it before. So read the manual and wuala:

:::sh
tail -f some_file | sed "1d"

Remove first 10 lines:

:::sh
tail -f some_file | sed '1,10d'

It do the same thing as first solution, but more clear and simple. sed is a great tool.

Enable line numbers in Toto syntaxhighlight

2010-09-04T00:00:00Z

Syntax Highlighting by Rack::CodeHighlighter gem has a bug. May be I did wrong steps. But by default CodeRay disable to show line numbers for code. I did not found any options to enable it by CodeHighlighter. So input next lines in config.ru will show line numbers.

:::ruby
CodeRay::Encoders["html"]::DEFAULT_OPTIONS[:line_numbers]=:inline

But I have a problem with css. I found that CodeHighlighter generate not correct html for CodeRay and default theme’s css for Toto broke this highlighting too. You could use my fixed coderay.css for Toto.

Geoip_city on Mac OS

2010-07-11T00:00:00Z

Today, I spent a time to install gem geoip_city. So what did I do:

Get latest version of GeoIP C Api from http://geolite.maxmind.com/download/geoip/api/c/

    wget http://geolite.maxmind.com/download/geoip/api/c/GeoIP-1.4.6.tar.gz
    tar zxf GeoIP-1.4.6.tar.gz
    cd GeoIP-1.4.6

Read file README.OSX. Found simple instructions to compile this lib.

    export GEOIP_ARCH='-arch i386 -arch x86_64 -arch ppc -arch ppc64'
    export MACOSX_DEPLOYMENT_TARGET=10.4
    export LDFLAGS=$GEOIP_ARCH
    export CFLAGS="-mmacosx-version-min=10.4 -isysroot /Developer/SDKs/MacOSX10.4u.sdk $GEOIP_ARCH"
    ./configure --disable-dependency-tracking
    perl -i.bak -pe'/^archive_cmds=/ and !/\bGEOIP_ARCH\b/ and s/-dynamiclib\b/-dynamiclib \\\$(GEOIP_ARCH)/' ./libtool
    make

When run all this stuff, I did not get a success result, I still have a error when install gem.
show available SDKs in you host
```
ls /Developer/SDKs 
```
I got two: MacOSX10.5.sdk MacOSX10.6.sdk
So change line in readme file before

export CFLAGS="-mmacosx-version-min=10.4 -isysroot /Developer/SDKs/MacOSX10.4u.sdk $GEOIP_ARCH"

export CFLAGS="-mmacosx-version-min=10.4 -isysroot /Developer/SDKs/MacOSX10.6.sdk $GEOIP_ARCH"

and execute all steps from README file.
but found a problem in step configure:

% ./configure --disable-dependency-tracking
checking for gcc... gcc
checking for C compiler default output file name...
configure: error: C compiler cannot create executables
See `config.log' for more details.

I choose another SDK and set to “MacOSX10.5.sdk”
run again all steps
then install gem and all works fine

if you have troubles to install gem and still see next message:

checking for GeoIP_record_by_ipnum() in -lGeoIP... no
you must have geoip c library installed!
*** extconf.rb failed ***
Could not create Makefile due to some reason, probably lack of
necessary libraries and/or headers.  Check the mkmf.log file for more
details.  You may need configuration options.

Provided configuration options:
     --with-opt-dir
     --without-opt-dir
     --with-opt-include
     --without-opt-include=${opt-dir}/include
     --with-opt-lib
     --without-opt-lib=${opt-dir}/lib
     --with-make-prog
     --without-make-prog
     --srcdir=.
     --curdir
     --ruby=/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/bin/ruby
     --with-geoip-dir
     --without-geoip-dir
     --with-geoip-include
     --without-geoip-include=${geoip-dir}/include
     --with-geoip-lib
     --without-geoip-lib=${geoip-dir}/lib
     --with-GeoIPlib
     --without-GeoIPlib

So you should add include /usr/local/lib to DYNLD_LIBRARY_PATH. Or do next: in step of configuration do ./configure —disable-dependency-tracking —prefix=/opt/GeoIP and then next steps from README. I suggest do make clean before each compiles. And then sudo gem install geoip_city — —with-geoip-dir=/opt/GeoIP to install gem.

Install Nokogiri on Mac OS

2010-07-01T00:00:00Z

Run in the terminal:

:::sh
sudo gem install nokogiri -- --with-xml2-include=/usr/include/libxml2 --with-xml2-lib=/usr/lib --with-xslt-dir=/usr