Dump entire database into seeds

dump_seeds.rake

namespace :db do
  task dump_seeds: :environment do
    Rails.application.eager_load!
    path = 'db/fixtures/gen/%s.rb'
    ObjectSpace.each_object(Class)
      .select{|c| c < ActiveRecord::Base && !c.abstract_class? }
      .each do |c|
        # skip if it's a view
        next if c.new.readonly?
        next unless c.attribute_names.include?('id')

        filename = c.name.underscore.gsub('/','_')

        begin
          SeedFu::Writer.write(path % filename, class_name: c.name, constraints: [:id]) do |writer|
            c.find_each do |model|
              writer.add model.attributes
            end
          end
        rescue ActiveRecord::StatementInvalid => e
          # probably a view we missed
          puts e
        end
      end
  end
end