Ruby on Rails在新线程上回滚

Question

I am running into an issue with the following code. For some reason, it will not allow me to modify the state of my progress bar after the rollback method. It will simply not do anything. I don't see why. And I can't call failed! method within the operation method because it will rollback and change the state of my progress bar.

class Importer
  attr_accessor :file

  def initialize(file)
   @file = file
   @pb = ProgressBar.create
   @pb.number_of_rows(file)
  end

  def import(user)
    Thread.new do
      ActiveRecord::Base.transaction do
        errs = operation(user)
        Rails.logger.info "HELLO"
        if errs.any?
          raise ActiveRecord::Rollback
          @pb.failed!
        end
      end
      Rails.logger.info "WORLD"
    end
  end

  def operation(user)
    errs = []
    i = 0
    user.insurances.each do |insurance|
      i = i+1
      if insurance.can_have_plan?
        Plan.create(:insurance => insurance)
        @pb.update_attribute(:current_row, i )
      else
        errs << "#{insurance.id} cant have a plan"
      end
    end
    errs
  end
end

When I delete raise, it will work as desired. Also, why it doesn't print HELLO but it only prints WORLD?

Answer 1

Try something like this. in your code @fb.failed also gets rolled back due to base transaction.

Your code should look like this.

def import(user)
    pb_failure = false
    Thread.new do
      ActiveRecord::Base.transaction do
        errs = operation(user)
        Rails.logger.info "HELLO"
        if errs.any?
          pb_failure = true
          raise ActiveRecord::Rollback
        end
      end
      @pb.failed! if pb_failure
      Rails.logger.info "WORLD"
    end
  end