Redmine

    result = {}

    workflow_permissions = WorkflowPermission.where(:tracker_id => tracker_id, :old_status_id => status_id, :role_id => roles.map(&:id)).all

    if workflow_permissions.any?

      workflow_rules = workflow_permissions.inject({}) do |h, wp|

        h[wp.field_name] ||= []

        h[wp.field_name] << wp.rule

        h

      end

      workflow_rules.each do |attr, rules|

        uniq_rules = rules.uniq

        if uniq_rules.size == 1

          result[attr] = uniq_rules.first

        else

          result[attr] = 'required'

        end

      end

    end

    @workflow_rule_by_attribute = result if user.nil?

    result