You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: problem_merge.rb
    path of file: ./repos/errbit/app/interactors
    
    the code of the file until where you have to start completion: require 'problem_destroy'

class ProblemMerge
  def initialize(*problems)
    problems = proble
    
  def merge
    child_problems.each do |problem|
      merged_problem.errs.concat problem.errs
      merged_problem.comments.concat problem.comments
      problem.reload # deference all associate objet to avoid delete him after
      ProblemDestroy.execute(problem)
    end
    merged_problem.recache
    merged_problem
  end