Question

这让我疯了！这段代码过去工作正常，但几周前它停止了工作，我无法解决原因。基本上游戏有很多补丁。错误发生在我的PatchesController中，但它在rails控制台中可重现，如下所示：

first_game = Game.find(:first)
first_game.patches

一旦我使用补丁方法，我就明白了：

ActiveRecord::StatementInvalid: SQLite3::SQLException: no such column: patches.game_true: SELECT * FROM "patches" WHERE ("patches".game_true = 1) 
    from /project_root/vendor/rails/activerecord/lib/active_record/connection_adapters/abstract_adapter.rb:221:in `rescue in log'
    from /project_root/vendor/rails/activerecord/lib/active_record/connection_adapters/abstract_adapter.rb:204:in `log'
    from /project_root/vendor/rails/activerecord/lib/active_record/connection_adapters/sqlite_adapter.rb:172:in `block in execute'
    from /project_root/vendor/rails/activerecord/lib/active_record/connection_adapters/sqlite_adapter.rb:417:in `catch_schema_changes'
    from /project_root/vendor/rails/activerecord/lib/active_record/connection_adapters/sqlite_adapter.rb:172:in `execute'
    from /project_root/vendor/rails/activerecord/lib/active_record/connection_adapters/sqlite_adapter.rb:320:in `select'
    from /project_root/vendor/rails/activerecord/lib/active_record/connection_adapters/abstract/database_statements.rb:7:in `select_all'
    from /project_root/vendor/rails/activerecord/lib/active_record/connection_adapters/abstract/query_cache.rb:62:in `select_all_with_query_cache'
    from /project_root/vendor/rails/activerecord/lib/active_record/base.rb:664:in `find_by_sql'
    from /project_root/vendor/rails/activerecord/lib/active_record/base.rb:1578:in `find_every'
    from /project_root/vendor/rails/activerecord/lib/active_record/base.rb:618:in `find'
    from /project_root/vendor/rails/activerecord/lib/active_record/associations/association_collection.rb:60:in `find'
    from /project_root/vendor/rails/activerecord/lib/active_record/associations/association_collection.rb:400:in `find_target'
    from /project_root/vendor/rails/activerecord/lib/active_record/associations/association_collection.rb:354:in `load_target'
    from /project_root/vendor/rails/activerecord/lib/active_record/associations/association_proxy.rb:140:in `inspect'
    from /usr/local/bin/irb:12:in `<main>'

现在SQL应该真的说'WHERE patches.game_id = 1'，除非我生气。我不知道为什么它会产生SQL！

这是模特/ game.rb：

class Game < ActiveRecord::Base
  has_many :patches
end

这是models / patches.rb：

class Patch < ActiveRecord::Base
  belongs_to :game
end

补丁表在表格中有'game_id'，还有3个条目，全部用于第一个游戏。如果我得到其中一个补丁并转到my_patch.game，它将返回它所属的Game对象，没有任何问题。任何帮助将不胜感激！

Answer 1

我能够找出问题所在。它在我的迁移文件中。我在迁移文件中使用了引用帮助器。

def up
create_table :reviews do |t|
    t.integer       :potatoes
    t.text          :comments
    t.references    :moviegoer
    t.references    :movie
end

我拼错了父类的模型名称。更正了名称，然后删除了我的数据库并重新创建了它 rake db：drop rake db：migrate

Answer 2

看起来您出于某种原因正在更改主键的名称。确保您的Game类没有类似的内容：

class Game < ActiveRecord::Base
  # Form #1
  self.primary_key = true

  # Form #2
  set_primary_key true
end

这可以用来将主键列从'id'重命名为任意的，在你的情况下看起来是'true'。

Answer 3

嗯愚蠢的问题，但是那个回溯声称缺少的列被称为“game_true”（在补丁表上）？我不认为它声称没有名为“补丁”的列。

SQLException: no such column: patches.game_true: SELECT * FROM "patches" WHERE ("patches".game_true = 1)

这应该改变你需要去的地方。

ActiveRecord为简单的has_many关联提供了“没有这样的列”SQL错误

3 个答案: