Sequel extension for crosstabs
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sequel-tablefunc.gemspec

README.md

Sequel::Tablefunc Build Status Gem Version Coverage Status

This is sequel extension makes using crosstab function more convenient

Installation

Add this line to your application's Gemfile:

gem 'sequel-tablefunc'

And then execute:

$ bundle

Usage

Assuming you have table which already have 2 categories. This table can be represented as a pivot table

  User.select_group(:type_id, :status_id)
      .select_append(:count.sql_function.*)
      .order(:type_id)
      .crosstab(User.select(:status_id).distinct.order(:status_id))
      .all
row_name status1 status2
type1 5 10
type2 1 2

It is easy, isn't it?

  User.select_group(:date_trunc.sql_function('year', :created_at), :status_id)
      .select_append(:count.sql_function.*)
      .order(:date_trunc.sql_function('year', :created_at))
      .crosstab(User.select(:status_id)
      .distinct
      .order(:status_id))
      .all
row_name status1 status2
2012-01-01 00:00:00 6 nil
2013-01-01 00:00:00 nil 12

Development

After checking out the repo, run bin/setup to install dependencies. Then, run rake spec to run the tests. You can also run bin/console for an interactive prompt that will allow you to experiment.

To install this gem onto your local machine, run bundle exec rake install. To release a new version, update the version number in version.rb, and then run bundle exec rake release, which will create a git tag for the version, push git commits and tags, and push the .gem file to rubygems.org.

Contributing

Bug reports and pull requests are welcome on GitHub at https://github.com/umbrellio/sequel-tablefunc.