Method: CustomTableConcern#custom_table_export

Defined in:
app/controllers/concerns/custom_table_concern.rb

#custom_table_export(format, collection, filename: nil) ⇒ Object 



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# File 'app/controllers/concerns/custom_table_concern.rb', line 39

def custom_table_export(format, collection, filename: nil)

  filename ||= collection.model.model_name.plural

  format.xlsx do
    # if collection.count > 1000
      # redirect_to params.permit!.merge({:format => :html}), alert: t("custom_table.huge_xlsx_alert", csv: helpers.link_to(t("custom_table.download_as_csv"), params.permit!.merge({:format => :csv})))
    # else
      response.headers['Content-Disposition'] = "attachment; filename=\"#{filename}.xlsx\""
    # end
  end

  format.csv do
    # Delete this header so that Rack knows to stream the content.
    headers.delete("Content-Length")
    # Do not cache results from this action.
    headers["Cache-Control"] = "no-cache"
    # Let the browser know that this file is a CSV.
    headers['Content-Type'] = 'text/csv'
    # Do not buffer the result when using proxy servers.
    headers['X-Accel-Buffering'] = 'no'
    # Set the filename
    headers['Content-Disposition'] = "attachment; filename=\"#{filename}.csv\"" 

    global_model_name = collection.model.model_name.singular

    fields = helpers.custom_table_fields_definition_for(collection.model)

    # Allow pre-defined fields for export
    if !@fields.nil?
      fields = fields.select { |k, _v| local_assigns[:fields].include?(k) }
    end 

    @csv_enumerator ||= Enumerator.new do |yielder|

      head = []

      fields.each do |field, defs|
        head.push (defs[:label].nil? ? collection.model.human_attribute_name(field) : defs[:label])
      end

      yielder << CSV.generate_line(head)

      collection.find_each do |item|

        row = []
        model_name = item.model_name.singular # Allows to show different class models in one table!
  
        fields.each do |field, defs|
          next if defs[:table] == false
      
          value = helpers.raw_field_value_for(item, field)
      
          if [Date, ActiveSupport::TimeWithZone].include?(value.class)
            value = value.to_date
          end
      
          row.push value
        end
      
        # Extra cols definition
        if defined?(@extra_cols)
          row += @extra_cols.call(item)
        end    

        yielder << CSV.generate_line(row)
      end
    end

    self.response_body = @csv_enumerator
  end

end