Question

当我在尝试迁移我的数据库时遇到错误时，我正在使用Ruby on Rails 3教程。即使在运行db：migrate之前执行db：drop，也会出现'无法将SQLite3 :: Statement转换为Array'错误。我试过更新rake并从我的Gemfile中删除rspec但是对我来说都不起作用。

rake db:migrate -t
** Invoke db:migrate (first_time)
** Invoke environment (first_time)   
** Execute environment
** Invoke db:load_config (first_time)
** Invoke rails_env (first_time)
** Execute rails_env 
** Execute db:load_config
** Execute db:migrate
   rake aborted!
   can't convert SQLite3::Statement into Array
   /Library/Ruby/Gems/1.8/gems/activerecord-3.1.1/lib/active_record/result.rb:30:in `zip'
   /Library/Ruby/Gems/1.8/gems/activerecord-3.1.1/lib/active_record/result.rb:30:in    `hash_rows'
   /Library/Ruby/Gems/1.8/gems/activerecord-3.1.1/lib/active_record/result.rb:29:in `map'
   /Library/Ruby/Gems/1.8/gems/activerecord-3.1.1/lib/active_record/result.rb:29:in `hash_rows'
   /Library/Ruby/Gems/1.8/gems/activerecord-3.1.1/lib/active_record/result.rb:20:in `each'
   /Library/Ruby/Gems/1.8/gems/activerecord- 3.1.1/lib/active_record/connection_adapters/sqlite_adapter.rb:315:in `map'
   /Library/Ruby/Gems/1.8/gems/activerecord-3.1.1/lib/active_record/connection_adapters/sqlite_adapter.rb:315:in `tables'
   /Library/Ruby/Gems/1.8/gems/activerecord-3.1.1/lib/active_record/connection_adapters/abstract/schema_statements.rb:25:in  `table_exists?'
   /Library/Ruby/Gems/1.8/gems/activerecord-3.1.1/lib/active_record/connection_adapters/abstract/schema_statements.rb:417:in `initialize_schema_migrations_table'
   /Library/Ruby/Gems/1.8/gems/activerecord-3.1.1/lib/active_record/migration.rb:634:in `initialize'
   /Library/Ruby/Gems/1.8/gems/activerecord-3.1.1/lib/active_record/migration.rb:549:in `new'
   /Library/Ruby/Gems/1.8/gems/activerecord-3.1.1/lib/active_record/migration.rb:549:in `up'
   /Library/Ruby/Gems/1.8/gems/activerecord-3.1.1/lib/active_record/migration.rb:530:in `migrate'
   /Library/Ruby/Gems/1.8/gems/activerecord-3.1.1/lib/active_record/railties/databases.rake:161
   /Library/Ruby/Gems/1.8/gems/rake-0.9.2.2/lib/rake/task.rb:205:in `call'
   /Library/Ruby/Gems/1.8/gems/rake-0.9.2.2/lib/rake/task.rb:205:in `execute'
   /Library/Ruby/Gems/1.8/gems/rake-0.9.2.2/lib/rake/task.rb:200:in `each'
   /Library/Ruby/Gems/1.8/gems/rake-0.9.2.2/lib/rake/task.rb:200:in `execute'
   /Library/Ruby/Gems/1.8/gems/rake-0.9.2.2/lib/rake/task.rb:158:in `invoke_with_call_chain'
     /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/monitor.rb:242:in `synchronize'
   /Library/Ruby/Gems/1.8/gems/rake-0.9.2.2/lib/rake/task.rb:151:in `invoke_with_call_chain'
   /Library/Ruby/Gems/1.8/gems/rake-0.9.2.2/lib/rake/task.rb:144:in `invoke'
   /Library/Ruby/Gems/1.8/gems/rake-0.9.2.2/lib/rake/application.rb:116:in `invoke_task'
   /Library/Ruby/Gems/1.8/gems/rake-0.9.2.2/lib/rake/application.rb:94:in `top_level'
   /Library/Ruby/Gems/1.8/gems/rake-0.9.2.2/lib/rake/application.rb:94:in `each'
   /Library/Ruby/Gems/1.8/gems/rake-0.9.2.2/lib/rake/application.rb:94:in `top_level'
   /Library/Ruby/Gems/1.8/gems/rake-0.9.2.2/lib/rake/application.rb:133:in `standard_exception_handling'
   /Library/Ruby/Gems/1.8/gems/rake-0.9.2.2/lib/rake/application.rb:88:in `top_level'
   /Library/Ruby/Gems/1.8/gems/rake-0.9.2.2/lib/rake/application.rb:66:in `run'
   /Library/Ruby/Gems/1.8/gems/rake-0.9.2.2/lib/rake/application.rb:133:in `standard_exception_handling'
   /Library/Ruby/Gems/1.8/gems/rake-0.9.2.2/lib/rake/application.rb:63:in `run'
   /Library/Ruby/Gems/1.8/gems/rake-0.9.2.2/bin/rake:33
   /usr/bin/rake:19:in `load'
   /usr/bin/rake:19
   Tasks: TOP => db:migrate

我正在使用的宝石是：

Using rake (0.9.2.2) 
Using multi_json (1.0.4) 
Using activesupport (3.1.1) 
Using builder (3.0.0) 
Using i18n (0.6.0) 
Using activemodel (3.1.1) 
Using erubis (2.7.0) 
Using rack (1.3.5) 
Using rack-cache (1.1) 
Using rack-mount (0.8.3) 
Using rack-test (0.6.1) 
Using hike (1.2.1) 
Using tilt (1.3.3) 
Using sprockets (2.0.3) 
Using actionpack (3.1.1) 
Using mime-types (1.17.2) 
Using polyglot (0.3.3) 
Using treetop (1.4.10) 
Using mail (2.3.0) 
Using actionmailer (3.1.1) 
Using arel (2.2.1) 
Using tzinfo (0.3.31) 
Using activerecord (3.1.1) 
Using activeresource (3.1.1) 
Using bundler (1.0.21) 
Using coffee-script-source (1.1.3) 
Using execjs (1.2.12) 
Using coffee-script (2.2.0) 
Using rack-ssl (1.3.2) 
Using json (1.6.3) 
Using rdoc (3.12) 
Using thor (0.14.6) 
Using railties (3.1.1) 
Using coffee-rails (3.1.1) 
Using jquery-rails (1.0.19) 
Using nokogiri (1.5.0) 
Using rails (3.1.1) 
Using sass (3.1.12) 
Using sass-rails (3.1.5) 
Using sqlite3 (1.3.5) 
Using sqlite3-ruby (1.2.5) 
Using uglifier (1.2.0) 
Using webrat (0.7.1)

对此错误感到非常困惑

迁移文件：

class CreateUsers < ActiveRecord::Migration
  def change
    create_table :users do |t|
      t.string :name
      t.string :email

      t.timestamps
    end
  end
end


class CreateItems < ActiveRecord::Migration
  def change
    create_table :items do |t|
      t.string :title
      t.string :description
      t.double :price
      t.string :category

      t.timestamps
    end
  end
end

使用ruby 1.9.2代替1.8.7导致：

    rake aborted!
    NoMethodError: undefined method `to_a' for #<SQLite3::Statement:0x007f9404b73b18>:
          SELECT name
          FROM sqlite_master
          WHERE type = 'table' AND NOT name = 'sqlite_sequence'

    Tasks: TOP => db:migrate

Answer 1

通过修改Gemfile来解决问题：

gem 'sqlite3', '1.3.5', :require => 'sqlite3'

而不是

gem 'sqlite3-ruby', '1.2.5', :require => 'sqlite3'

在教程

中提供

Rails 3 rake db：migrate失败并且'rake aborted！无法将SQLite3 :: Statement转换为Array'

1 个答案: