所以，我有一个为旧的 php 应用程序设置的数据库，我无法触摸数据库的完成方式。
但是，我在 db 中有一些列名，它们在 Ruby 中使用了一些受限制的单词，例如“class”
所以为了让它工作，我使用了alias_attribute.
但它不起作用。这是代码：
class Contractor < ActiveRecord::Base
set_table_name "contractors"
alias_attribute :class_type, :class
attr_accessible :about, :alias, :business_entity, :business_logo, :business_name, :city, :class, :county, :created, :email, :founded, :metroarea, :nid, :phone, :state, :status, :street_address, :uid, :zipcode
end
以下是错误：
1.9.3-p125 :001 > Contractor.last
SyntaxError: /Users/snoopy/.rvm/gems/ruby-1.9.3-p125/gems/activemodel-3.2.13/lib/active_model/attribute_methods.rb:345: syntax error, unexpected ')', expecting '='
from /Users/snoopy/.rvm/gems/ruby-1.9.3-p125/gems/activemodel-3.2.13/lib/active_model/attribute_methods.rb:343:in `module_eval'
from /Users/snoopy/.rvm/gems/ruby-1.9.3-p125/gems/activemodel-3.2.13/lib/active_model/attribute_methods.rb:343:in `define_optimized_call'
from /Users/snoopy/.rvm/gems/ruby-1.9.3-p125/gems/activemodel-3.2.13/lib/active_model/attribute_methods.rb:227:in `block in alias_attribute'
from /Users/snoopy/.rvm/gems/ruby-1.9.3-p125/gems/activemodel-3.2.13/lib/active_model/attribute_methods.rb:224:in `each'
from /Users/snoopy/.rvm/gems/ruby-1.9.3-p125/gems/activemodel-3.2.13/lib/active_model/attribute_methods.rb:224:in `alias_attribute'
from /Users/snoopy/Projects/buildzoom/ruby/service_request/app/models/contractor.rb:3:in `<class:Contractor>'
from /Users/snoopy/Projects/buildzoom/ruby/service_request/app/models/contractor.rb:1:in `<top (required)>'
from /Users/snoopy/.rvm/gems/ruby-1.9.3-p125/gems/activesupport-3.2.13/lib/active_support/dependencies.rb:469:in `load'
from /Users/snoopy/.rvm/gems/ruby-1.9.3-p125/gems/activesupport-3.2.13/lib/active_support/dependencies.rb:469:in `block in load_file'
from /Users/snoopy/.rvm/gems/ruby-1.9.3-p125/gems/activesupport-3.2.13/lib/active_support/dependencies.rb:639:in `new_constants_in'
from /Users/snoopy/.rvm/gems/ruby-1.9.3-p125/gems/activesupport-3.2.13/lib/active_support/dependencies.rb:468:in `load_file'
from /Users/snoopy/.rvm/gems/ruby-1.9.3-p125/gems/activesupport-3.2.13/lib/active_support/dependencies.rb:353:in `require_or_load'
from /Users/snoopy/.rvm/gems/ruby-1.9.3-p125/gems/activesupport-3.2.13/lib/active_support/dependencies.rb:502:in `load_missing_constant'
from /Users/snoopy/.rvm/gems/ruby-1.9.3-p125/gems/activesupport-3.2.13/lib/active_support/dependencies.rb:192:in `block in const_missing'
from /Users/snoopy/.rvm/gems/ruby-1.9.3-p125/gems/activesupport-3.2.13/lib/active_support/dependencies.rb:190:in `each'
from /Users/snoopy/.rvm/gems/ruby-1.9.3-p125/gems/activesupport-3.2.13/lib/active_support/dependencies.rb:190:in `const_missing'
from (irb):1
from /Users/snoopy/.rvm/gems/ruby-1.9.3-p125/gems/railties-3.2.13/lib/rails/commands/console.rb:47:in `start'
from /Users/snoopy/.rvm/gems/ruby-1.9.3-p125/gems/railties-3.2.13/lib/rails/commands/console.rb:8:in `start'
from /Users/snoopy/.rvm/gems/ruby-1.9.3-p125/gems/railties-3.2.13/lib/rails/commands.rb:41:in `<top (required)>'
from script/rails:6:in `require'
from script/rails:6:in `<main>'
和
1.9.3-p125 :003 > Contractor.where(:zipcode => "94111")
Contractor Load (648.6ms) SELECT `contractors`.* FROM `contractors` WHERE `contractors`.`zipcode` = '94111'
(Object doesn't support #inspect)
=>
最后一个仅在我删除 alias_attribute 时出现，否则与第一个错误相同