ruby rails 迁移未更新数据库

Question

我运行进入了一个 rails 项目，其中迁移似乎没有影响 database/tables。

Rails4/Ruby2.0/Sqllite/开发版

以前如果我设置迁移，结果会反映在数据库和表中（使用 sqlite 数据浏览器）

现在，当我创建迁移时，它运行的错误代码为 0，但数据库中没有任何变化。例如，如果我设置此迁移和运行 Rake d:migrate，则不会向数据库添加任何内容。

class CreateTestModel < ActiveRecord::Migration
  def change

      def up
        create_table :products do |t|
          t.string :name
          t.text :description

          t.timestamps
        end
      end

      def down
        drop_table :products
      end


  end
end

rake 迁移运行s，错误代码为 0

C:\Ruby200\bin\ruby.exe -e $stdout.sync=true;$stderr.sync=true;load([=13=]=ARGV.shift) C:/Users/cmendla/RubymineProjects/Rl2/bin/rake db:migrate C:/Ruby200/lib/ruby/gems/2.0.0/gems/actionpack-4.2.4/lib/action_dispatch/http/mime_type.rb:163: warning: already initialized constant Mime::PDF C:/Ruby200/lib/ruby/gems/2.0.0/gems/actionpack-4.2.4/lib/action_dispatch/http/mime_type.rb:163: warning: previous definition of PDF was here C:/Ruby200/lib/ruby/gems/2.0.0/gems/actionpack-4.2.4/lib/action_dispatch/http/mime_type.rb:163: warning: already initialized constant Mime::BMP C:/Ruby200/lib/ruby/gems/2.0.0/gems/actionpack-4.2.4/lib/action_dispatch/http/mime_type.rb:163: warning: previous definition of BMP was here C:/Ruby200/lib/ruby/gems/2.0.0/gems/actionpack-4.2.4/lib/action_dispatch/http/mime_type.rb:163: warning: already initialized constant Mime::JPEG C:/Ruby200/lib/ruby/gems/2.0.0/gems/actionpack-4.2.4/lib/action_dispatch/http/mime_type.rb:163: warning: previous definition of JPEG was here C:/Ruby200/lib/ruby/gems/2.0.0/gems/actionpack-4.2.4/lib/action_dispatch/http/mime_type.rb:163: warning: already initialized constant Mime::JPG C:/Ruby200/lib/ruby/gems/2.0.0/gems/actionpack-4.2.4/lib/action_dispatch/http/mime_type.rb:163: warning: previous definition of JPG was here C:/Ruby200/lib/ruby/gems/2.0.0/gems/actionpack-4.2.4/lib/action_dispatch/http/mime_type.rb:163: warning: already initialized constant Mime::GIF C:/Ruby200/lib/ruby/gems/2.0.0/gems/actionpack-4.2.4/lib/action_dispatch/http/mime_type.rb:163: warning: previous definition of GIF was here == 20151015154920 CreateTestModel: migrating ================================== == 20151015154920 CreateTestModel: migrated (0.0000s) =========================

Process finished with exit code 0

我怀疑 sql 数据库可能被锁定了。我确实重启了我的笔记本电脑，但它也不起作用。

注意 - 我有很多混乱的迁移。我试图通过删除一些后来的迁移和未使用的数据表来理顺事情。不确定这是否导致了问题。

Answer 1

改为

class CreateTestModel < ActiveRecord::Migration
  def change
    create_table :products do |t|
      t.string :name
      t.text :description
      t.timestamps
    end
  end
end

或

class CreateTestModel < ActiveRecord::Migration
  def up
    create_table :products do |t|
      t.string :name
      t.text :description
      t.timestamps
    end
  end

  def down
    drop_table :products
  end

end

很确定您的问题是在更改方法中使用 up 和 down 方法。

然后重新运行迁移。

ruby rails 迁移未更新数据库

ruby rails migrate is not updating database

ruby

migration

sqlite

ruby-on-rails