Module: UsefulRenderers::CsvRenderable

Defined in:
lib/useful_renderers/csv_renderable.rb

Instance Method Summary collapse

Instance Method Details

#to_csv(options = {}) ⇒ Object

Converts an array to CSV formatted string Options include: :only => [:col1, :col2] # Specify which columns to include :except => [:col1, :col2] # Specify which columns to exclude :add_methods => [:method1, :method2] # Include addtional methods that aren’t columns



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# File 'lib/useful_renderers/csv_renderable.rb', line 12

def to_csv(options = {})
  klass = first.class
  return '' if empty?
  return join(',') unless klass.respond_to? :column_names

  columns = klass.column_names
  if options[:only]
    columns = []
    options[:only].each do |method|
      columns << method.to_s if first.respond_to?(method)
    end
  end

  columns -= options[:except].map(&:to_s)      if options[:except]
  columns += options[:add_methods].map(&:to_s) if options[:add_methods]

  headers = columns.dup
  headers.map!{|col| klass.human_attribute_name col } if options[:translate]

  csv_options = {
    encoding: 'utf-8',
    headers: headers,
    write_headers: true
  }

  CSV.generate(csv_options) do |row|
    self.each do |obj|
      row << columns.map { |c| obj.send(c) }
    end
  end
end