CsvStreamer

Streams CSV files one row at a time as live data is generated instead of waiting for the whole file to be created and then sent to the client. Works on most standard web servers including Nginx, Passenger, Unicorn, Thin etc., but does NOT work on Webrick.

Installation

Add this line to your application's Gemfile:

gem 'csv_streamer'

And then execute:

$ bundle

Or install it yourself as:

$ gem install csv_streamer

Usage

In your model:

class MyModel

  def self.header_row
    CSV::Row([:name, :title], ['Name', 'Title'], true)
  end

  def to_csv_row
    CSV::Row(name: name, title: title)
  end

end

In your controller:

Class ExportsController

  def index

    stream_csv('data.csv', MyModel.header_row) do |rows|
      MyModel.find_each do |my_model|
        rows << my_model.to_csv_row
      end
    end

  end
end

Contributing

1. Fork it
2. Create your feature branch (git checkout -b my-new-feature)
3. Commit your changes (git commit -am 'Add some feature')
4. Push to the branch (git push origin my-new-feature)
5. Create new Pull Request