CSV Blueprints

A simple and small DSL to generate CSV files.

Declaratively specify a CSV blueprint:

require "csv_blueprints"
require "faker"

blueprint = CsvBlueprints.specify do
  column "ID", value: :sequence
  column "Name", value: -> i { Faker::Name.name }
  columns "Login", "Email", value: -> i { "email#{i}@example.com" }
  column "Type", static: "Client"
  column "Notes", value: :blank
end

We're using the faker gem here for realistic names

This one blueprint can generate multiple plans. E.g. differing numbers of rows or to override the row's values:

# three rows
plan = blueprint.plan.standard(3)
plan.write

will generate a CSV like:

ID,Name,Login,Email,Type,Notes
1,Val Kulas DVM,email1@example.com,email1@example.com,Client,
2,Marsha Sporer,email2@example.com,email2@example.com,Client,
3,Mrs. Bennett Bechtelar,email3@example.com,email3@example.com,Client,

Another plan from the same blueprint

# two rows with duplicate IDs and a note
plan_with_duplicate_ids = blueprint.plan.customized(2, "ID" => 999, "Notes" => "Imported on #{Date.today.strftime('%Y-%m-%d')}")
plan_with_duplicate_ids.write

would generate

ID,Name,Login,Email,Type,Notes
999,Tiffanie Schaden,email1@example.com,email1@example.com,Client,Imported on 2019-03-04
999,Mr. Arie Stroman,email2@example.com,email2@example.com,Client,Imported on 2019-03-04

Add this line to your application's Gemfile:

gem "csv_blueprints"

And then execute:

$ bundle

Or install it yourself as:

$ gem install csv_blueprints

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/jmks/csv_blueprints.

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