Julia Builder

Julia helps you out to create flexible builders to easily export your queries to csv (for now).

Add this line to your application's Gemfile:

gem 'julia_builder'

And then execute:

$ bundle

Or install it yourself as:

$ gem install julia_builder

For non rails projects

require 'julia'

1. Create your own builder class, inherit from Julia::Builder and configure your csv columns.

   class UserCsv < Julia::Builder
     # specify column's header and value
     column 'Birthday', :dob
     # header equals 'Birthday' and the value will be on `user.dbo`
   
     # when header and value are the same, no need to duplicate it.
     column :name
     # header equals 'name', value will be `user.name`
   
     # specify many columns at once
     columns :name, :lastname, :dob
   
     # when you need to do some extra work on the value you can pass a proc.
     column 'Full name', -> { "#{ name.capitalize } #{ last_name.capitalize }" }
   
     # or you can pass a block
     column 'Type' do |user|
       user.class.name
     end
   
     # include your own mixins
     include ActionView::Helpers::DateHelper
   
     column 'age' do |c|
       time_ago_in_words c.dob
     end
   end

2. Now you can use your builder to generate your csv out of a query like:

   users = User.all
   UserCsv.build(users)
   
   # or
   UserCsv.build(users, <csv options>)
   
   # e.g. no headers
   UserCsv.build(users, write_headers: false)

   Csv options could be anything CSV::new understands, but they are optional.

3. Enjoy

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.

Bug reports and pull requests are welcome on GitHub at https://github.com/stevenbarragan/julia_builder/issues. This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the Contributor Covenant code of conduct.

The gem is available as open source under the terms of the MIT License.