Ruby-on-rails rake db:schema:dump 是否从迁移或数据库本身重新创建 schema.rb？
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Does rake db:schema:dump recreate schema.rb from migrations or the database itself?
提问by pingu
Does
做
rake db:schema:dump
recreate schema.rbfrom migrations or the database itself?
schema.rb从迁移或数据库本身重新创建？
回答by Radek Paviensky
The answer is simple: from the database.
答案很简单：来自数据库。
By the way - when you take a look into the source code of db:* tasksyou can see that migration tasks calls schema:dump after the run
顺便说一句 - 当您查看 db:* tasks 的源代码时，您可以看到迁移任务在运行后调用了 schema:dump
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
So the migration works in the way that it change the database and thengenerate schema.rb file.
因此，迁移的工作方式是更改数据库，然后生成 schema.rb 文件。
