8
我有以下协会代码：未知关键
has_many :rates_without_dimension, :as => :rateable, :class_name => "Rate",
:dependent => :destroy, :conditions => {:dimension => nil}
has_many :raters_without_dimension, :through => :rates_without_dimension,
:source => :rater
has_one :rate_average_without_dimension, :as => :cacheable,
:class_name => "RatingCache",
:dependent => :destroy, :conditions => {:dimension => nil}
dimensions.each do |dimension|
has_many "#{dimension}_rates", :dependent => :destroy,
:conditions => {:dimension => dimension.to_s},
:class_name => "Rate",
:as => :rateable
has_many "#{dimension}_raters", :through => "#{dimension}_rates",
:source => :rater
has_one "#{dimension}_average", :as => :cacheable, :class_name => "RatingCache",
:dependent => :destroy, :conditions => {:dimension => dimension.to_s}
end
它提出了一个错误：
Unknown key: :conditions. Valid keys are: :class_name, :class, :foreign_key, :validate, :autosave, :table_name, :before_add, :after_add, :before_remove, :after_remove, :extend, :primary_key, :dependent, :as, :through, :source, :source_type, :inverse_of, :counter_cache
我想的第一行变成：
has_many :rates_without_dimension, :as => :rateable, :class_name => "Rate", :dependent => :destroy,-> { where(:dimension => nil) }
但它也提出了一个错误，你能指出我有什么问题吗？这里https://teamtreehouse.com/forum/unknown-key-conditions
描述
编辑该问题以包含来自外部网站的源代码。从[SO帮助]（http://stackoverflow.com/help/how-to-ask）：“如果可以创建一个可以链接到的问题的实例（例如http：// sqlfiddle.com/或http://jsbin.com/），然后这样做 - 但也包括代码在您的问题本身。不是每个人都可以访问外部网站，并且链接可能会随着时间的推移而中断。“ – Amadan
感谢您的编辑和引用:) –
使用 - >符号的错误是什么？ – JTG