module Enumerable
def hash_map
hash = {}
self.each {|o| hash.store(*yield(o))}
hash
end
end
my_hash = lines.hash_map {|l| l.split /:/}
Great suggestion on redit for creating a hash from other objects.
I added assert_empty to check that an array is empty.
But the line number from test helper.rb was the first line of the test helper, not the line in the test.
Instead, I wanted to see the actual failure as the first line. Welcome remove_me_from_trace(exception)
class Test::Unit::TestCase
def assert_empty(*args)
begin
args.unshift []
assert_equal *args
rescue => e
raise remove_me_from_trace(e)
end
end
def remove_me_from_trace(e)
x=e.backtrace.shift until (x =~ /test_helper.rb/ )
e
end
end
I normally don’t like hacking rails files directly, but this is the only way I could extend rake db:migrate to support a friendly VERSION.
railities/lib/tasks/database.rake on line 111.
# was ENV["VERSION"] ? ENV["VERSION"].to_i : nil
# looks up version based upon migration files
def version_num
version=ENV["VERSION"]
if version.to_i==0 && version.present?
matches=Dir["db/migrate/*#{ENV["VERSION"]}*"]
if matches.length > 0
#prune off directory name
matches=matches.collect{|n| n.gsub(/^.*\//,'')}
unless matches.length == 1
raise "VERSION #{version} matches "+
"#{matches.join(', ')}"
end
#prune off version num
version=matches.first.gsub(/([^_]*)_.*$/) {$1}
puts "VERSION=#{version}"
end
end
version ? version.to_i : nil
end
In 3 places (migrate, up, down), the version code is changed from
ENV["VERSION"] ? ENV["VERSION"].to_i : nil
to
version_num
Now rake db:migrate:down VERSION=create_photo works like a charm.
I have been using a schell script so I don’t need to remember the long version number associated with ruby migrations.
#given a migration task, return the version
#e.g.: rake db:migrate:redo VERSION=$(mver create_photo)
function mver() {
scr=${1:?Please specify migration action}
ls db/migrate/*${scr}* | sed 's=^[^0-9]*\([0-9][^_]*\)_.*$=\1='
}
which will run migration 20100302214328_create_photos_and_folders.rb
![If you do printf debugging, this adds pretty colors and only shows for the user requesting the logging
# if you want to customize, redefine in initializers
# passenger does not define ENV['USER']
USER=ENV['HOME'].split('/').last
#usage: my_log 'kbrock', 'UserController#logout', name
#only for me, will log
def my_log(*args)
who=args.shift #determine who wants to see this
if who.nil? || who == USER
theme=args.shift
params = args.join ' ' || ''
params += ' ' + yield if block_given?
message="\e[1;34m#{theme}\e[0m #{params}"
Rails.logger.debug(message)
puts(message) unless Rails.env.test?
end
end](http://29.media.tumblr.com/tumblr_l5t2yeF2P31qzc7cto1_250.png)
![Tests rebuild database which takes a bit of time. I hacked Rakefile to not rebuild database every time.
Rake::Task['features'].clear_prerequisites rescue nil # For some super weird reason this fails for some...
Rake::Task['default'].clear_prerequisites rescue nil
Rake::Task['spec'].clear_prerequisites rescue nil
task :spec => %w[db:abort_if_pending_migrations]
task :features => %w[db:abort_if_pending_migrations]
desc "Run all tests and features"
task :default => %w(spec features)](http://25.media.tumblr.com/tumblr_l4kxbqWSRL1qzc7cto1_100.png)
![Rake task to generate model diagrams in a rails project
namespace :doc do
desc "document db: (annotate, schema.rb, dot)"
task :db=>%w(annotate_models db:schema:dump doc:dot)
desc "Use railroad to generate graphviz dot files"
task :dot do
#tack on stuff at the top of the page
FORMAT=%q{sed 's/graph\\[/ graph[page="8.5,11",\
size="7.5,10",center=1];\
node[shape=Mrecord,width="1.2",fillcolor="#cccccc",\
style="filled", penwidth="2"]\
edge [ minlen="1.2", penwidth="2"]\
graph[/'}
now=`rake db:version`.chomp.split(' ')[-1]
models="doc/models#{now}.dot"
#hide magic hides created_at, updated_at
puts `railroad -liM --hide-magic|#{FORMAT}>#{models}`
[models].each do |filename|
filetype='pdf'
outfile=filename.gsub('.dot',".#{filetype}")
#create viewable file (graphviz must be installed)
puts `dot -T#{filetype} #{filename} -o#{outfile}`
#open the file using mac graphviz app
puts `open #{filename} -a graphviz`
end
end
end](http://25.media.tumblr.com/tumblr_l4kwyujIMG1qzc7cto1_400.jpg)
