rake db:schema:dump 是否从迁移或数据库本身重新创建 schema.rb? [英] Does rake db:schema:dump recreate schema.rb from migrations or the database itself?

问题描述

会

rake db:schema:dump

从迁移或数据库本身重新创建 schema.rb?

recreate schema.rb from migrations or the database itself?

推荐答案

答案很简单:来自数据库.

The answer is simple: from the database.

顺便说一句 - 当你 采取查看 db:* tasks 的源代码 可以看到迁移任务在运行后调用了 schema:dump

By the way - when you take a look into the source code of db:* tasks you can see that migration tasks calls schema:dump after the run

desc "Migrate the database (options: VERSION=x, VERBOSE=false)."
task :migrate => :environment do
  ActiveRecord::Migration.verbose = ENV["VERBOSE"] ? ENV["VERBOSE"] == "true" : true
  ActiveRecord::Migrator.migrate("db/migrate/", ENV["VERSION"] ? ENV["VERSION"].to_i : nil)
  Rake::Task["db:schema:dump"].invoke if ActiveRecord::Base.schema_format == :ruby
end

因此，迁移的工作方式是更改数据库并然后生成 schema.rb 文件.

So the migration works in the way that it change the database and then generate schema.rb file.

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