ruby-on-rails – Capistrano 3部署：由于缺少主要迁移而未执行

为了弄清楚出了什么问题,我进入了capistrano-rails源代码,并将deploy：migrate方法直接复制到我的deploy.rb文件中.我添加了一堆打印行,发现当它进入方法时,它没有返回任何内容,因为行：在主要提取(：migration_role)上返回一个空数组.

capistrano documentation指的是主要定义的方式,如果没有指定,则第一个列出的角色是默认主要角色.

这是我插入到deploy.rb文件中的capistrano-rails源代码,我唯一的修改是两个放置行.

namespace :deploy do
  desc 'Runs rake db:migrate if migrations are set'
  task :migrate => [:set_rails_env] do
    puts "on primary fetch(:migration_role) ==> #{on primary fetch(:migration_role)}"
    on primary fetch(:migration_role) do
      puts "+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++"
      conditionally_migrate = fetch(:conditionally_migrate)
      info '[deploy:migrate] Checking changes in /db/migrate' if conditionally_migrate
      if conditionally_migrate && test("diff -q #{release_path}/db/migrate #{current_path}/db/migrate")
        info '[deploy:migrate] Skip `deploy:migrate` (nothing changed in db/migrate)'
      else
        info '[deploy:migrate] Run `rake db:migrate`' if conditionally_migrate
        within release_path do
          with rails_env: fetch(:rails_env) do
            execute :rake,"db:migrate"
          end
        end
      end
    end
  end

  after :updated,:migrate
end

以下是我的staging.rb角色文件中可能相关的一些其他设置.我更改了我的特定服务器名称.

role :app,%w{deploy@example.com}
role :web,%w{deploy@example.com}


# Default deploy_to directory is /var/www/my_app
set :deploy_to,'/path/to/my/staging_dir'


# Define server(s)
server 'example.com',user: 'deploy',roles: %w{web app}

# Setup Options
set :migration_role,'migrator'
set :conditionally_migrate,true
set :assets_roles,[:web,:app]

如果您对此处可能出现的问题有任何疑问,请告诉我.谢谢！