The idea is implement a simple way to describe what and how should the data be exported.

Example:

Export.transform User do
  replace :full_name, -> { FFaker::Name.name }
  replace :password, 'password'
  replace :email, -> (r) { "#{r.email.split('@').first}@example.com" }
  ignore :created_at, :updated_at
end

And then is possible to apply your rules with the tables:

dump = Export::TransformData.new(User)
result = dump.process(User.all)

And export the tranformed values to a file:

File.open('results.json', 'w+') {|f|f.puts result.to_json }

Currently you can also specify a dump schema, to fetch a specific scenario of data:

Export.dump 'last 3 monts user' do
  model User, -> { where(["created_at > ?",  3.months.ago]) }

  ignore AuditableItem

  on_fetch_data {|table, data| puts "Exported #{data.size} from #{table}" }

  on_fetch_error do |table, error, full_trace|
    puts "Ops! something goes wrong importing #{table}", error, full_trace
  end
end

Imagine that you also have a table orders that depends on users. It will automatically load only the orders related to the current user.

The same will happen with order_items that depends of what orders are being exported.

• all include all records from n *tables
• model receives a class and allow you specify a scope directly in the model class.

How to test

We have an example on examples/rails_test that you can use:

cd examples/rails_test
rake db:setup    # Populate with some seeds
rake export:init # Generate the default configuration

It will generate an initial suggestion with setting up the configuration:

Export.table 'users' do
  replace :full_name, -> { FFaker::Name.name }
  replace :password, 'password'
  replace :email, -> (r) { "#{r.email.split('@').first}@example.com" }
end

Export.table 'addresses'

To test all the process:

rake export:dump

Check the normalized results under results.json file.

TODO

• Make it load the generated dump file
• Explore SQL, yml and and other data formats
• Port lib/tasks/export.rake from rails example to the lib
• Allow use fake :full_name syntax

Export.table 'users' do
  fake :full_name
  fake :email
end