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- !ruby/object:Pacdoc
attributes:
id: 5
pac_id: 5
doc_id: 1
created_at: 2013-06-26 12:07:33.263881000 Z
updated_at: 2013-06-26 12:07:33.263881000 Z
- !ruby/object:Pacdoc
attributes:
id: 6
pac_id: 5
doc_id: 2
created_at: 2013-06-26 12:07:33.266881000 Z
updated_at: 2013-06-26 12:07:33.266881000 Z
值已經收集在可變@pdocs上述數據,並能夠挑選出這些值的DOC_ID檢索與基準數據以可變
<%= @pdocs.each do |a| %>
<%= b = a.doc_id %>
<% end%>
現在想以檢索'doc'的結構doc_id中的數據,名稱:字符串下面是型號
models
class Pacdoc < ActiveRecord::Base
attr_accessible :doc_id, :pac_id
belongs_to :pac
belongs_to :doc
end
class Pac < ActiveRecord::Base
attr_accessible :name
validates :name, :presence => :true
has_many :pacdocs
has_many :docs, :through => :pacdocs
end
class Doc < ActiveRecord::Base
attr_accessible :name
validates :name, :presence => :true
has_many :pacdocs
has_many :pacs, :through => :pacdocs
end
謝謝你馬里奧,這工作正是我想要的,你可以建議如何克服約束(N + 1查詢) – diva
N + 1查詢的問題是相當簡單的。我建議你閱讀Rails指南的以下部分。它解釋了N + 1查詢是什麼以及如何避免它們。 http://guides.rubyonrails.org/active_record_querying.html#eager-loading-associations – mario