Class: FindAndReplaceRunner

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# File 'backend/app/lib/find_and_replace_runner.rb', line 6

def self.instance_for(job)
  if job.job_type == "find_and_replace_job"
    self.new(job)
  else
    nil
  end
end

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# File 'backend/app/lib/find_and_replace_runner.rb', line 15

def run
  super

  job_data = @json.job

  terminal_error = nil

  parsed = JSONModel.parse_reference(job_data['base_record_uri'])
  base_model = Kernel.const_get(parsed[:type].camelize)
  base_record = base_model.any_repo[parsed[:id]]

  target_model = case job_data['record_type']
                 when 'date'
                   ASDate
                 else
                   Kernel.const_get(job_data['record_type'].camelize)
                 end

  target_property = job_data['property']
  target_ids = base_record.object_graph.ids_for(target_model)

  find = job_data['find'] =~ /^\/.+\/$/ ? Regexp.new(job_data['find'][1..-2]) : job_data['find']
  replace = job_data['replace']

  modified_records = []

  begin
    DB.open(DB.supports_mvcc?,
            :retry_on_optimistic_locking_fail => true) do

      begin

        target_ids.each do |id|

          RequestContext.open(:current_username => @job.owner.username,
                              :repo_id => @job.repo_id) do
            json = target_model.to_jsonmodel(id)

            next unless json[target_property]
            result = json[target_property].gsub!(find, replace)

            next if result.nil?

            @job.write_output("Updating #{target_model.to_s}[#{id}].#{target_property}")

            target_model[id].update_from_json(json)

            if json.uri
              modified_records << json.uri
            else
              # it would be nice to capture
              # '/#' urls for nested records
              # and be able to resolve them
              # but that would require a rethink

              nested_model = target_model[id][:instance_id] ? Instance : target_model

              [:resource_id, :archival_object_id].each do |col|
                nesting_id = nested_model[id][col]
                if nesting_id
                  nesting_model = Kernel.const_get(col.to_s[0..-4].camelize)
                  modified_records << nesting_model[nesting_id].uri
                  break
                end
              end
            end

          end

        end

        if modified_records.empty?
          @job.write_output("All done, no records modified.")
        else
          @job.write_output("All done, logging modified records.")
        end

        # just reuse JobCreated api for now...
        @job.record_created_uris(modified_records.uniq)

      rescue Exception => e
        terminal_error = e
        raise Sequel::Rollback
      end

    end

  rescue
    terminal_error = $!
  end

  if terminal_error
    @job.write_output(terminal_error.message)
    @job.write_output(terminal_error.backtrace)

    raise terminal_error
  end

end