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[英]undefined method `updated_at' for #<MatchResult::ActiveRecord_Relation:0x0000000232e608> in rails
[英]Rails ActiveRecord::Relation undefined method
我有示范醫院:
class Hospital < ActiveRecord::Base
attr_accessible :beds, :fax_no, :hospital_name, :phone_no, :district_id, :institution_type_id, :location_id, :division_id, :block_id, :hospital_type_id, :IsAdministrativeLocation, :IsTribal, :latitude, :longitude
belongs_to:district
belongs_to:division
belongs_to:institution_type
belongs_to:hospital_type
belongs_to:block
has_many:hospital_reports
has_many:health_dept_locations
has_many:sanctioned_posts
has_many:postings
has_many:vw_sanctioned_working_by_hospitals
end
vw_sanctioned_working_by_hospitals是如下視圖
mysql> desc vw_sanctioned_working_by_hospital;
+--------------------+---------------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+--------------------+---------------+------+-----+---------+-------+
| hospital_id | int(11) | NO | | 0 | |
| hospital_name | varchar(255) | YES | | NULL | |
| class_1_sanctioned | decimal(32,0) | NO | | 0 | |
| class_1_working | bigint(21) | NO | | 0 | |
| class_1_vacant | decimal(33,0) | NO | | 0 | |
| class_2_sanctioned | decimal(32,0) | NO | | 0 | |
| class_2_working | bigint(21) | NO | | 0 | |
| class_2_vacant | decimal(33,0) | NO | | 0 | |
+--------------------+---------------+------+-----+---------+-------+
vw_sanctioned_working_by_hospital模型如下:
class VwSanctionedWorkingByHospital < ActiveRecord::Base
self.table_name = 'vw_sanctioned_working_by_hospital'
belongs_to:hospital
end
但是我收到以下錯誤:
Showing /home/akash/hrmis/beauty4/app/views/hospitals/show.html.erb where line #11 raised:
undefined method `class_1_sanctioned' for #<ActiveRecord::Relation:0xb1e5bd0>
Extracted source (around line #11):
8: <div class="span4">
9: <dl class="dl-horizontal">
10: <dt><strong>class_1_sanctioned:</strong></dt>
11: <dd><%= @hospital.vw_sanctioned_working_by_hospitals.class_1_sanctioned %></dd>
12:
13: <dt><strong>Hospital Name:</strong></dt>
14: <dd><%= @hospital.hospital_name %></dd>
我要去哪里錯了? 我已經讀過db視圖可以像只讀表一樣被解釋,那是什么問題呢?
我的關聯是正確的,並且看起來一切正常,但是我仍然無法呈現class_1_sanctioned
列。
您具有has_many關系:
has_many :vw_sanctioned_working_by_hospitals
實際上,這將返回一個關系而不是單個對象。 您將需要指定想要的對象,例如
@hospital.vw_sanctioned_working_by_hospitals.first.class_1_sanctioned
@hospital.vw_sanctioned_working_by_hospitals.last.class_1_sanctioned
@hospital.vw_sanctioned_working_by_hospitals[123].class_1_sanctioned
或者(您很有可能是您想要的)您需要遍歷該關系:
<% @hospital.vw_sanctioned_working_by_hospitals.each do |vw_sanctioned| %>
<%= vw_sanctioned.class_1_sanctioned %>
<% end %>
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