quick write csv files CSVReports::Base.new objects, columns=[ :attr1, :attr2]

csv_reports.rb

require 'csv'

module CSVReports
  class Base
    attr_accessor :columns, :column_separator, :row_separator
    
    def initialize items, columns=[]
      @items = items
      
      self.columns = columns
      self.column_separator = ','
      self.row_separator = "\n"
    end

    def to_s
      rows.join @row_separator
    end

    def to_csv_file
      csv_file = "#{Rails.root.to_s}/tmp/#{Time.now.utc.to_s.gsub('-', '').gsub(':', '').delete(' ')}.csv"
      CSV.open(csv_file, "w") do |csv|
        rows.each { |row| csv << [row] }
      end
      csv_file
    end

    def rows
      @items.collect{ |item| row item}
    end

    private

    def row item
      data = @columns.collect{ |column| eval("item.#{column.to_s}")}
      data = data.join @column_separator
    end
  end
end

class MyCSVReport < CSVReports::Base
  def initialize objects
    super objects, [:id, :name]
  end
end

# CSVReports::Base.new objects, columns=[ :attr1, :attr2]
# MyCSVReport.new objects