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Posted 2021-03-19

class CreateUsers < ActiveRecord::Migration[6.0]
  def change
    create_table :users do |t|
      t.string :user

      t.timestamps
    end
  end
end

class CreateArticles < ActiveRecord::Migration[6.0]
  def change
    create_table :articles do |t|
      t.string :content


      t.timestamps
    end
  end
end

我在一个新项目中创建了这两个实体，当我运行迁移时，我得到了这个错误。

rails db:setup
Created database 'rails_api_development'
Created database 'rails_api_test'
C:/Users/admin/Desktop/projects/rails-api/db/schema.rb doesn't exist yet. Run `rails db:migrate` to create it, then try again. If you do not intend to use a database, you should instead alter C:/Users/admin/Desktop/projects/rails-api/config/application.rb to limit the frameworks that will be loaded.

admin@Desktop MINGW32 ~/Desktop/projects/rails-api (master)
$ rails db:migrate
rails aborted!
ActiveRecord::StatementInvalid: mysql2::Error: Specified key was too long; max key length is 1000 bytes
bin/rails:4:in `require'
bin/rails:4:in `<main>'

Caused by:
Mysql2::Error: Specified key was too long; max key length is 1000 bytes
bin/rails:4:in `require'
bin/rails:4:in `<main>'
Tasks: TOP => db:migrate
(See full trace by running task with --trace)

另外，为什么它说mysql2 即使我输入mysql作为数据库？rails到底出了什么问题？是ORM的问题还是其他配置问题？