Ruby on Rails - 尝试捆绑执行时未定义的方法"强" Rake DB：MIGRATE

Question

我使用Ruby 2.2.2和Rails 4.2.3。

我做的命令是:

 rails generate scaffold User name:string email:string
 bundle exec rake db:migrate

我得到的错误是:

 rake aborted!
 StandardError: An error has occurred, this and all later migrations canceled:
 undefined method `strong' for #<ActiveRecord::ConnectionAdapters::TableDefinition:0x00000005b72028>/home/clemant/tutorials/test2/db/migrate/20150709221657_create_users.rb:5:in `block in change'

我的迁移文件:

class CreateUsers < ActiveRecord::Migration
  def change
    create_table :users do |t|
      t.string :name
      t.strong :email
      t.timestamps null: false
    end
  end
end

我的数据库。Yml文件是:

# SQLite version 3.x
#   gem install sqlite3
#
#   Ensure the SQLite 3 gem is defined in your Gemfile
#   gem 'sqlite3'
#
default: &default
  adapter: sqlite3
  pool: 5
  timeout: 5000
development:
  <<: *default
  database: db/development.sqlite3
# Warning: The database defined as "test" will be erased and
# re-generated from your development database when you run "rake".
# Do not set this db to the same as development or production.
test:
  <<: *default
  database: db/test.sqlite3
production:
  <<: *default
  database: db/production.sqlite3

你知道怎么解决这个问题吗?

Answer 1

在您的迁移文件中，您写了:t.strong :email .

应按如下方式整改:

t.string :email