The project is in a healthy, maintained state
This library adds spreadsheet-centric jobs to the Burner library. Burner does not ship with non-CSV spreadsheet jobs out of the box.
 Project Readme

Spreadsheet Fuel

Gem Version Build Status Maintainability Test Coverage License: MIT

This library is a plugin for Burner. It adds jobs focused around spreadsheet processing such as reading and writing Microsoft Excel Open XML spreadsheets (.xlsx files).


To install through Rubygems:

gem install spreadsheet_fuel

You can also add this to your Gemfile:

bundle add spreadsheet_fuel


Refer to the Burner library for more specific information on how Burner works. This section will just focus on what this library directly adds.

  • spreadsheet_fuel/deserialize/xlsx [register, sheet_mappings]: Take the register, parse it as a Microsoft Excel Open XML spreadsheet and store the sheet data in the specified sheet_mappings' registers. Each sheet mapping specifies which sheet to read and where to place the parsed data. If no sheet mappings are specified then the default sheet will be parsed and placed in the register.
  • spreadsheet_fuel/serialize/xlsx [register, sheet_mappings]: Create a Microsoft Excel Open XML workbook and write all specified register data into their respective sheets. The sheet_mappings will specify which sheets get data and from which register.


Reading an Excel Spreadsheet

Let's use the example fixture file as an example XLSX file to read and parse (located at spec/fixtures/patients_and_notes.xlsx). We could execute the following Burner pipeline:

pipeline = {
  jobs: [
      name: 'read',
      type: 'b/io/read',
      path: File.join('spec', 'fixtures', 'patients_and_notes.xlsx') # change as necessary
      name: 'parse',
      type: 'spreadsheet_fuel/deserialize/xlsx',
      sheet_mappings: [
        { sheet: 'Patients', register: 'patients' },
        { sheet: 'Notes',    register: 'notes' }
  steps: %w[read parse]

payload =

Burner::Pipeline.make(pipeline).execute(payload: payload)

Inspecting the payload's registers would now look something like this:

patients = payload[:patients] # [%w[chart_number first_name last_name], ...]
notes    = payload[:notes] # [%w[emp_number note_number contents],, ...]

Writing an Excel Spreadsheet

Let's do an exact opposite of the above example. Let's say we would like to write a spreadsheet given a few registers of data:

pipeline = {
  jobs: [
      name: 'load_patients',
      type: 'b/value/static',
      register: :patients,
      value: [
        %w[chart_number first_name last_name],
        [123, 'Bozo', 'Clown'],
        ['A456', nil, 'Rizzo'],
        %w[Z789 Hops Bunny]
      name: 'load_notes',
      type: 'b/value/static',
      register: :notes,
      value: [
        %w[emp_number note_number contents],
        ['A456', 1, 'Hello world!'],
        [nil, 2, 'Hello, again!'],
        ['Z789', 1, 'Something something…']
      name: 'write_workbook',
      type: 'spreadsheet_fuel/serialize/xlsx',
      register: :spreadsheet,
      sheet_mappings: [
        { sheet: 'Patients', register: :patients },
        { sheet: 'Notes',    register: :notes }
  steps: %w[load_patients load_notes write_workbook]

payload =

Burner::Pipeline.make(pipeline).execute(payload: payload)


Development Environment Configuration

Basic steps to take to get this repository compiling:

  1. Install Ruby (check spreadsheet_fuel.gemspec for versions supported)
  2. Install bundler (gem install bundler)
  3. Clone the repository (git clone
  4. Navigate to the root folder (cd spreadsheet_fuel)
  5. Install dependencies (bundle)

Running Tests

To execute the test suite run:

bundle exec rspec spec --format documentation

Alternatively, you can have Guard watch for changes:

bundle exec guard

Also, do not forget to run Rubocop:

bundle exec rubocop


Note: ensure you have proper authorization before trying to publish new versions.

After code changes have successfully gone through the Pull Request review process then the following steps should be followed for publishing new versions:

  1. Merge Pull Request into master
  2. Update lib/spreadsheet_fuel/version.rb using semantic versioning
  3. Install dependencies: bundle
  4. Update with release notes
  5. Commit & push master to remote and ensure CI builds master successfully
  6. 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

Code of Conduct

Everyone interacting in this codebase, issue trackers, chat rooms and mailing lists is expected to follow the code of conduct.


This project is MIT Licensed.