Dump large table to JSON file in ruby

data_json_dump.rb

File.open(file_path, 'w') do |file|
  file.write("[")
  if records.any?
    last_id = records.last.id
    records.find_each do |model|
      file.write(model.to_json(except: excluded_columns))
      file.write(",\n") if model.id != last_id
    end
  end
  file.write("]\n")
 end

JSON dumping solutions expect you to do something simpler like:

File.open(file_path, 'w') do |file|
  file.write(records.to_json(except: excluded_columns))
end

this will inevitably crash if your table contains millions of rows.

You can use the above script when dumping ActiveRecord tables for example