我正在使用 MySQL 数据库和mysql2
gem 开发 Rails v2.3 应用。我遇到了一个奇怪的情况,即 rake 任务中改变环境。
(我对环境和数据库的所有设置和配置都是正确的,没问题。)
这是我的简单故事:
我有一个像下面这样的rake任务:
namespace :db do
task :do_something => :environment do
#1. run under 'development' environment
my_helper.run_under_development_env
#2. change to 'custom' environment
RAILS_ENV='custom'
Rake::Task['db:create']
Rake::Task['db:migrate']
#3. change back to 'development' environment
RAILS_ENV='development'
#4. But it still run in 'customer' environment, why?
my_helper.run_under_development_env
end
end
rake 任务非常简单,它的作用是:
1。首先,在“开发”环境下从my_helper
运行方法
2. 然后,更改为“自定义”环境并运行db:create
和db:migrate
直到现在,一切都很好,环境确实变为“自定义”
3. 然后,再将其更改回“开发”环境
4. 在“开发”环境下再次运行辅助方法
但是,虽然我已在步骤3中将环境更改回“开发”,但最后一种方法仍然在“自定义”环境中运行,为什么?以及如何摆脱它?
--- P.S. ---
我还检查过帖子related with environment change here,并尝试在那里使用解决方案(在步骤2中):
#2. change to 'custom' database
ActiveRecord::Base.establish_connection('custom')
Rake::Task['db:create']
Rake::Task['db:migrate']
更改数据库连接而不是更改环境,但db:create
和db:migrate
仍将在“开发”数据库下运行,但链接的帖子表示应该运行对于“自定义”数据库......很奇怪
---------------重要更新---------------------
我只是意识到第2步中的代码:
#2. change to 'custom' environment
RAILS_ENV='custom'
Rake::Task['db:create']
Rake::Task['db:migrate']
只有当Rake::Task['db:create']
被调用时才会将环境更改为“自定义”,如果我注释掉Rake::Task['db:create']
行,代码仍会运行在“开发”下:
#2. change to 'custom' environment
RAILS_ENV='custom'
#Rake::Task['db:create']
#CODE WILL RUN STILL UNDER 'development' environment.
为什么Rake::Task['db:create']
会影响我的环境变化......?
答案 0 :(得分:3)
我意识到这个问题是从一个多月前开始的,但他们说的是什么 - 这是圣诞节
似乎在自己的流程中运行每个rake任务会简化交换环境时的事情吗?
namespace :db do
task :do_something => :environment do
unless Rails.env.development? then
raise "Can only run under development environment, but specified env was #{Rails.env}"
end
#1. run under 'development' environment
my_helper.run_under_development_env
#2. do the giggity with custom environment
command = "bundle exec rake db:create RAILS_ENV=custom"
result = %x[#{command}]
raise "rake task failed..........\n#{result}" if result.include?('rake aborted!')
command = "bundle exec rake db:migrate RAILS_ENV=custom"
result = %x[#{command}]
raise "rake task failed..........\n#{result}" if result.include?('rake aborted!')
#3. back to development
my_helper.run_under_development_env
end
end
答案 1 :(得分:1)
仅在耙任务RAILS_ENV ='production'之后键入
以您的情况
rake db:do_something RAILS_ENV ='custom'