Exporting CSV data from Rails

Question

I\'m working to export csv data from rails. I\'m following the tutorial here: http://railscasts.com/episodes/362-exporting-csv-and-excel?view=asciicast

In my control

Answer 1

I also met this problem, which was already solved by this answer: https://stackoverflow.com/a/17311372/3458781

Shortly, you have to restart your server. Hope it works for you.

Answer 2

The to_csv is a class method. Meaning its meant to be called like Group.to_csv. You might want to change the method signature to something like Group.to_csv(groups) instead.

 def self.to_csv(groups)
    Rails.logger.info "Hello World"
    CSV.generate do |csv|
      csv << column_names
      groups.each do |product|
        csv << product.attributes.values_at(*column_names)
      end
    end
  end

Then in show

  def show
    # @company is being provided correctly.
    @groups = @company.groups
    render text: Group.to_csv(@groups)
  end  

Answer 3

A quick version for rails console that is not for prod but just to have access to the data in excel:

first do :

print TableName.first.attributes.map{|a,v| a}.join(",")

second do :

TableName.all.each{|t| print t.attributes.map{|a,v| a}.join(",") + "\n"}; nil

copy the result of this two call in a csv file