Capistrano 3部署:由于缺少主要迁移而未执行迁移

Question

我有capistrano设置将rails应用程序部署到远程服务器.在部署代码时一切都运行良好,但即使我capistrano-rails安装了gem,也没有迁移数据库.当我在服务器上手动迁移迁移时,迁移会起作用,但让它们自动运行会更好

为了弄清楚出了什么问题,我进入了capistrano-rails源代码,并将该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,它没有返回任何东西,因为行:on primary fetch(:migration_role)返回一个空数组.

该Capistrano的文档是指被定义的主怎么说,首批上市的作用是默认的主,如果没有指定.

这是capistrano-rails我插入到deploy.rb文件中的源代码,我唯一的修改是两puts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!

Answer 1

将"db"添加到服务器的角色:

server 'example.com', user: 'deploy', roles: %w{web app db}

另外,在你的Capfile:

require 'capistrano/rails/migrations'

我相信你也会想要这些必需的陈述Capfile:

require 'capistrano/bundler'
require 'capistrano/rails/assets'