Question

I’ve got a few instances where some duplicate records were created and now I need to clean them out since I’ve figured out what was causing them.

I have ResponseSets and each ResponseSet has_many Responses.

Each Response has a value for answer_id and that answer_id should only be present once for any ResponseSet.

So what I need to do is find duplicate Responses for each ResponseSet based on if there are more than one of the same answer_id.

My brain hurts trying to explain, so if more details are needed, please just ask.

Answer 1

Try something like this:

ResponseSets.all.each do |set|
  answer_ids = []
  set.responses.each do |r|
    puts "Response #{r.id}: set=#{set.id}, answer=#{r.answer_id}"
    if answer_ids.include? r.answer_id
      puts "Duplicate found!"
      # r.destroy  # Uncomment when you feel it is safe
    else
      answer_ids << r.answer_id
    end
  end
end