每个分支都有独立的数据库
这是唯一的飞行方式。
2017年10月16日更新
一段时间后，我返回到此页面并进行了一些改进：
- 我添加了另一个名称空间rake任务来创建一个分支，并使用来一次克隆数据库
bundle exec rake git:branch。
- 现在，我意识到从master克隆并不总是您想要做的，因此我更加明确地说明了该
db:clone_from_branch任务采用SOURCE_BRANCH和TARGET_BRANCH环境变量。使用git:branch时会自动将当前分支用作SOURCE_BRANCH。
- 重构和简化。
config/database.yml
为了使您更轻松，这里介绍了如何更新database.yml文件以根据当前分支动态确定数据库名称。
<%
database_prefix = 'your_app_name'
environments = %W( development test )
current_branch = `git status | head -1`.to_s.gsub('On branch ','').chomp
%>
defaults: &defaults
pool: 5
adapter: mysql2
encoding: utf8
reconnect: false
username: root
password:
host: localhost
<% environments.each do |environment| %>
<%= environment %>:
<<: *defaults
database: <%= [ database_prefix, current_branch, environment ].join('_') %>
<% end %>
lib/tasks/db.rake
这是一项Rake任务，可以轻松地将数据库从一个分支克隆到另一个分支。这需要一个SOURCE_BRANCH和TARGET_BRANCH环境变量。基于@spalladino的任务。
namespace :db do
desc "Clones database from another branch as specified by `SOURCE_BRANCH` and `TARGET_BRANCH` env params."
task :clone_from_branch do
abort "You need to provide a SOURCE_BRANCH to clone from as an environment variable." if ENV['SOURCE_BRANCH'].blank?
abort "You need to provide a TARGET_BRANCH to clone to as an environment variable." if ENV['TARGET_BRANCH'].blank?
database_configuration = Rails.configuration.database_configuration[Rails.env]
current_database_name = database_configuration["database"]
source_db = current_database_name.sub(CURRENT_BRANCH, ENV['SOURCE_BRANCH'])
target_db = current_database_name.sub(CURRENT_BRANCH, ENV['TARGET_BRANCH'])
mysql_opts = "-u #{database_configuration['username']} "
mysql_opts << "--password=\"#{database_configuration['password']}\" " if database_configuration['password'].presence
`mysqlshow #{mysql_opts} | grep "#{source_db}"`
raise "Source database #{source_db} not found" if $?.to_i != 0
`mysqlshow #{mysql_opts} | grep "#{target_db}"`
raise "Target database #{target_db} already exists" if $?.to_i == 0
puts "Creating empty database #{target_db}"
`mysql #{mysql_opts} -e "CREATE DATABASE #{target_db}"`
puts "Copying #{source_db} into #{target_db}"
`mysqldump #{mysql_opts} #{source_db} | mysql #{mysql_opts} #{target_db}`
end
end
lib/tasks/git.rake
此任务将在当前分支（主分支或其他分支）的基础上创建一个git分支，将其检出并将当前分支的数据库克隆到新分支的数据库中。光滑的AF。
namespace :git do
desc "Create a branch off the current branch and clone the current branch's database."
task :branch do
print 'New Branch Name: '
new_branch_name = STDIN.gets.strip
CURRENT_BRANCH = `git status | head -1`.to_s.gsub('On branch ','').chomp
say "Creating new branch and checking it out..."
sh "git co -b #{new_branch_name}"
say "Cloning database from #{CURRENT_BRANCH}..."
ENV['SOURCE_BRANCH'] = CURRENT_BRANCH # Set source to be the current branch for clone_from_branch task.
ENV['TARGET_BRANCH'] = new_branch_name
Rake::Task['db:clone_from_branch'].invoke
say "All done!"
end
end
现在，您所需要做的就是运行bundle exec git:branch，输入新的分支名称并开始杀死僵尸。