ActiveRecord的并不在一个工作表中 [英] ActiveRecord doesn't work on one table

问题描述

我有一个Rails型号：

I have a Rails Model:

ruby-1.9.2-p0 > NavItem
 => NavItem(id: integer, item_identifier: string, description: string, description2: string, packing_unit: string, sales_unit_of_measure: string, ean_code: string, evp_price: string, item_category_code: string, class: string, product_group_code: string, maintenance_status: string) 

如果我想创建一个记录：

If I want to create a record:

ruby-1.9.2-p0 > NavItem.create
NoMethodError: undefined method `has_key?' for nil:NilClass
 from /Users/amueller/.rvm/gems/ruby-1.9.2-p0/gems/activesupport-3.0.0/lib/active_support/whiny_nil.rb:48:in `method_missing'
 from /Users/amueller/.rvm/gems/ruby-1.9.2-p0/gems/activerecord-3.0.0/lib/active_record/attribute_methods/read.rb:69:in `class'
 from /Users/amueller/.rvm/gems/ruby-1.9.2-p0/gems/activerecord-3.0.0/lib/active_record/persistence.rb:285:in `attributes_from_column_definition'
 from /Users/amueller/.rvm/gems/ruby-1.9.2-p0/gems/activerecord-3.0.0/lib/active_record/locking/optimistic.rb:62:in `attributes_from_column_definition'
 from /Users/amueller/.rvm/gems/ruby-1.9.2-p0/gems/activerecord-3.0.0/lib/active_record/base.rb:1396:in `initialize'
 from /Users/amueller/.rvm/gems/ruby-1.9.2-p0/gems/activerecord-3.0.0/lib/active_record/base.rb:496:in `new'
 from /Users/amueller/.rvm/gems/ruby-1.9.2-p0/gems/activerecord-3.0.0/lib/active_record/base.rb:496:in `create'
 from (irb):20
 from /Users/amueller/.rvm/gems/ruby-1.9.2-p0/gems/railties-3.0.0/lib/rails/commands/console.rb:44:in `start'
 from /Users/amueller/.rvm/gems/ruby-1.9.2-p0/gems/railties-3.0.0/lib/rails/commands/console.rb:8:in `start'
 from /Users/amueller/.rvm/gems/ruby-1.9.2-p0/gems/railties-3.0.0/lib/rails/commands.rb:23:in `<top (required)>'
 from script/rails:6:in `require'
 from script/rails:6:in `<main>'

我能做些什么？我有工作就好了其他车型。我不知道如何:(是否有任何保留字的列或做Rails的尝试应用这一公约上神奇的一些配置赶上这个错误？

What can I do? I have other Models which works just fine. I dont know how to catch this error :( Are there any reserved words in the columns or do Rails try to apply some configuration over convention magic on this?

我用Rails3使用Ruby 1.9.2。

I use Rails3 with Ruby 1.9.2.

推荐答案

正在使用类（保留字）作为列名之一。如果改变了，你应该罚款。

You are using class (a reserved word) as one of your column names. If you change that, you should be fine.

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