リレーショナルテーブルでSQLite3 :: SQLException：そのような列に問題が発生するレール

Question

解決策が見つからないようです。私はリレーショナルテーブル、BlabsUserを持っています。そこからレコードを見つけて破壊しようとしています。私はこれをやっている：

BlabsUser.find_by_user_id_and_blab_id(1,29).destroy 

そして、この素敵なエラーを取得：

BlabsUser Load (0.2ms) SELECT "blabs_users".* FROM "blabs_users" WHERE "blabs_users"."user_id" = 1 AND "blabs_users"."blab_id" = 29 LIMIT 1 
Could not log "sql.active_record" event. NoMethodError: undefined method `name' for nil:NilClass 
SQLite3::SQLException: no such column: blabs_users.: DELETE FROM "blabs_users" WHERE "blabs_users"."" = ? 
ActiveRecord::StatementInvalid: SQLite3::SQLException: no such column: blabs_users.: DELETE FROM "blabs_users" WHERE "blabs_users"."" = ? 
    from /Users/dylandrop/.rvm/gems/ruby-1.9.2-p290/gems/sqlite3-1.3.5/lib/sqlite3/database.rb:91:in `initialize' 
    from /Users/dylandrop/.rvm/gems/ruby-1.9.2-p290/gems/sqlite3-1.3.5/lib/sqlite3/database.rb:91:in `new' 
    from /Users/dylandrop/.rvm/gems/ruby-1.9.2-p290/gems/sqlite3-1.3.5/lib/sqlite3/database.rb:91:in `prepare' 
    from /Users/dylandrop/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-3.1.3/lib/active_record/connection_adapters/sqlite_adapter.rb:234:in `block in exec_query' 
    from /Users/dylandrop/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-3.1.3/lib/active_record/connection_adapters/abstract_adapter.rb:244:in `block in log' 
    from /Users/dylandrop/.rvm/gems/ruby-1.9.2-p290/gems/activesupport-3.1.3/lib/active_support/notifications/instrumenter.rb:21:in `instrument' 
    from /Users/dylandrop/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-3.1.3/lib/active_record/connection_adapters/abstract_adapter.rb:239:in `log' 
    from /Users/dylandrop/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-3.1.3/lib/active_record/connection_adapters/sqlite_adapter.rb:223:in `exec_query' 
    from /Users/dylandrop/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-3.1.3/lib/active_record/connection_adapters/sqlite_adapter.rb:249:in `exec_delete' 
    from /Users/dylandrop/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-3.1.3/lib/active_record/connection_adapters/abstract/database_statements.rb:101:in `delete' 
    from /Users/dylandrop/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-3.1.3/lib/active_record/connection_adapters/abstract/query_cache.rb:14:in `delete' 
    from /Users/dylandrop/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-3.1.3/lib/active_record/relation.rb:351:in `delete_all' 
    from /Users/dylandrop/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-3.1.3/lib/active_record/persistence.rb:94:in `destroy' 
    from /Users/dylandrop/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-3.1.3/lib/active_record/locking/optimistic.rb:119:in `destroy' 
    from /Users/dylandrop/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-3.1.3/lib/active_record/callbacks.rb:254:in `block in destroy' 
    from /Users/dylandrop/.rvm/gems/ruby-1.9.2-p290/gems/activesupport-3.1.3/lib/active_support/callbacks.rb:390:in `_run_destroy_callbacks' 
    from /Users/dylandrop/.rvm/gems/ruby-1.9.2-p290/gems/activesupport-3.1.3/lib/active_support/callbacks.rb:81:in `run_callbacks' 
    from /Users/dylandrop/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-3.1.3/lib/active_record/callbacks.rb:254:in `destroy' 
    from /Users/dylandrop/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-3.1.3/lib/active_record/transactions.rb:236:in `block in destroy' 
    from /Users/dylandrop/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-3.1.3/lib/active_record/transactions.rb:295:in `block in with_transaction_returning_status' 
    from /Users/dylandrop/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-3.1.3/lib/active_record/connection_adapters/abstract/database_statements.rb:192:in `transaction' 
    from /Users/dylandrop/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-3.1.3/lib/active_record/transactions.rb:208:in `transaction' 
    from /Users/dylandrop/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-3.1.3/lib/active_record/transactions.rb:293:in `with_transaction_returning_status' 
    from /Users/dylandrop/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-3.1.3/lib/active_record/transactions.rb:236:in `destroy' 
    from (irb):1 
    from /Users/dylandrop/.rvm/gems/ruby-1.9.2-p290/gems/railties-3.1.3/lib/rails/commands/console.rb:45:in `start' 
    from /Users/dylandrop/.rvm/gems/ruby-1.9.2-p290/gems/railties-3.1.3/lib/rails/commands/console.rb:8:in `start' 
    from /Users/dylandrop/.rvm/gems/ruby-1.9.2-p290/gems/railties-3.1.3/lib/rails/commands.rb:40:in `<top (required)>' 
    from script/rails:6:in `require' 
    from script/rails:6:in `<main>' 

は、なぜそれがblabs_usersという列を探していますか？なぜ私のblabs_usersテーブルのレコードを探していないのですか？また、もっと重要なことに、私はこれをどのように修正するのですか？

編集： そして、私も同じ問題でこれを試してみた：要求ごととして、

BlabsUser.destroy_all(:blab_id => 29, :user_id => 1) 

編集2：は私のモデルはちょうど

class BlabsUser < ActiveRecord::Base 
end 

の移行である ただです

class BlabsUsers < ActiveRecord::Migration 
    def self.up 
     create_table :blabs_users, :id => false, :force => true do |t| 
      t.integer :user_id 
      t.integer :blab_id 
      t.timestamps 
     end 
    end 

    def self.down 
     drop_table :blabs_users 
    end 
end 

Answer 1

ActiveRecordは、作業するユニークなキー（通常はテーブルの主キー）にかなり依存しています。明示的に定義されていない（:id => false）ので、あなたの問題はそれに関連していると強く疑います。

destroy()も強く、それが固有のIDを用いて動作することが必要示唆所与IDを持つオブジェクト（または複数のオブジェクト）を破壊として記載されています。