ruby-on-rails – Rails 3：Model.all => NoMethodError：未
发布时间：2020-12-17 03:35:36 所属栏目：百科 来源：网络整理
导读：我正在尝试围绕预先存在的 MySQL数据库构建一个Rails应用程序.我创建了rails项目,正确设置了database.yml文件并创建了一个模型User,以对应db中的users表.当我运行rails控制台来测试它时,这就是我得到的： User.all(32.4ms) SHOW TABLES(34.9ms) describe `us
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我正在尝试围绕预先存在的
MySQL数据库构建一个Rails应用程序.我创建了rails项目,正确设置了database.yml文件并创建了一个模型User,以对应db中的users表.当我运行rails控制台来测试它时,这就是我得到的：
> User.all (32.4ms) SHOW TABLES (34.9ms) describe `users` NoMethodError: undefined method `accept' for nil:NilClass from /home/richard/.rvm/gems/ruby-1.9.3-p0/gems/activerecord-3.2.1/lib/active_record/connection_adapters/abstract/database_statements.rb:7:in `to_sql' from /home/richard/.rvm/gems/ruby-1.9.3-p0/gems/activerecord-3.2.1/lib/active_record/connection_adapters/abstract/database_statements.rb:16:in `select_all' from /home/richard/.rvm/gems/ruby-1.9.3-p0/gems/activerecord-3.2.1/lib/active_record/connection_adapters/abstract/query_cache.rb:63:in `select_all' from /home/richard/.rvm/gems/ruby-1.9.3-p0/gems/activerecord-3.2.1/lib/active_record/querying.rb:38:in `block in find_by_sql' from /home/richard/.rvm/gems/ruby-1.9.3-p0/gems/activerecord-3.2.1/lib/active_record/explain.rb:40:in `logging_query_plan' from /home/richard/.rvm/gems/ruby-1.9.3-p0/gems/activerecord-3.2.1/lib/active_record/querying.rb:37:in `find_by_sql' from /home/richard/.rvm/gems/ruby-1.9.3-p0/gems/activerecord-3.2.1/lib/active_record/relation.rb:170:in `exec_queries' from /home/richard/.rvm/gems/ruby-1.9.3-p0/gems/activerecord-3.2.1/lib/active_record/relation.rb:159:in `block in to_a' from /home/richard/.rvm/gems/ruby-1.9.3-p0/gems/activerecord-3.2.1/lib/active_record/explain.rb:33:in `logging_query_plan' from /home/richard/.rvm/gems/ruby-1.9.3-p0/gems/activerecord-3.2.1/lib/active_record/relation.rb:158:in `to_a' from /home/richard/.rvm/gems/ruby-1.9.3-p0/gems/activerecord-3.2.1/lib/active_record/relation/finder_methods.rb:159:in `all' from /home/richard/.rvm/gems/ruby-1.9.3-p0/gems/activerecord-3.2.1/lib/active_record/querying.rb:5:in `all' from (irb):1 from /home/richard/.rvm/gems/ruby-1.9.3-p0/gems/railties-3.2.1/lib/rails/commands/console.rb:47:in `start' from /home/richard/.rvm/gems/ruby-1.9.3-p0/gems/railties-3.2.1/lib/rails/commands/console.rb:8:in `start' from /home/richard/.rvm/gems/ruby-1.9.3-p0/gems/railties-3.2.1/lib/rails/commands.rb:41:in `<top (required)>' from script/rails:6:in `require' from script/rails:6:in `<main>'1.9.3-p0 :002 > ^C 知道为什么会这样吗？据我所知,我遵循rails约定：我创建了一个User模型,与db中已经存在的名为users的表对应,其主键是一个名为id的整数字段. 解决方法
刚刚遇到同样的问题.将其缩小为与MySQL相关的问题,因为它仅在登台环境(MySQL)中发生,而不是在开发环境(sqlite3)中发生.通过将mysql2从版本0.2.7升级到0.3.11来修复它.
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