json.(issue, :id, :subject, :project_issues_index)
json.blockchain_token_num (Site.has_blockchain? && issue.project&.use_blockchain) ? issue.blockchain_token_num : nil
json.created_at issue.created_on.strftime("%Y-%m-%d %H:%M")
json.updated_at issue.updated_on.strftime("%Y-%m-%d %H:%M")
json.tags issue.show_issue_tags.each do |tag|
  json.partial! "api/v1/issues/issue_tags/simple_detail", locals: {tag: tag}
end
json.status_name issue.issue_status&.name 
json.priority_name issue.priority&.name 
json.milestone_name issue.version&.name
json.milestone_id issue.fixed_version_id
json.author do
  if issue.user.present? 
    json.partial! "api/v1/users/simple_user", locals: {user: issue.user}
  else 
    json.nil! 
  end
end
json.assigners issue.show_assigners.each do |assigner| 
  json.partial! "api/v1/users/simple_user", locals: {user: assigner}
end
json.comment_journals_count issue.comment_journals.size