0
我想在表policy_logs中搜索,如果它有pdf。如何在另一个表值中使用一个ID表?
这里我表:
|policies|
|id| |name|
1 abc
2 def
3 ghi
|policy_logs|
|id| |name| |policy_id|
1 ab.pdf 1
2 cd.pdf 1
3 ef.pdf 3
4 ij.pdf 3
我试图使用所有列policy_id从像 “身份证” policy_logs在政策表
这里我的控制器:
@pdf = PolicyLog.find(:all,:select=>['policy_id as pdf'],:group=>['policy_id'])
@policy = Policy.find(:all,:conditions=>['id IN (?)',@pdf ])
这里我的型号:
class Policy < ActiveRecord::Base
has_many :policy_logs
end
class PolicyLog < ActiveRecord::Base
belongs_to :policy
end
这里我的观点:
<% @policy.each do |p| %>
<%= p.id %>
<%= p.name %>
<% end %>
这是要我要像结果
|id| |policy_id|
1 1
3 3
我试过,但越来越NULL值:
@pdf = PolicyLog.find(:all,:select=>['policy_id as pdf'],:group=>['policy_id'])
@policy = Policy.find(:all,:conditions=>['id IN (?)',@pdf ])
这里是日志:
SELECT policy_id as pdf FROM `policy_logs` GROUP BY policy_id
SELECT * FROM `policies` WHERE (id IN (NULL),(NULL),(NULL),(NULL))
使用数组0也试过:
@pdf = PolicyLog.find(:all,:select=>['policy_id as pdf'],:group=>['policy_id'])
@policy = Policy.find(:all,:conditions=>['id IN (?)',@pdf[0].pdf ])
但我只有一个结果,这里是日志:
SELECT policy_id as pdf FROM `policy_logs` GROUP BY policy_id
SELECT * FROM `policies` WHERE (id IN (1))
使用阵列1也试过:
@pdf = PolicyLog.find(:all,:select=>['policy_id as pdf'],:group=>['policy_id'])
@policy = Policy.find(:all,:conditions=>['id IN (?)',@pdf[1].pdf ])
但我只得到了一个结果,这里是日志:
SELECT policy_id as pdf FROM `policy_logs` GROUP BY policy_id
SELECT * FROM `policies` WHERE (id IN (3))
最后我试图
@pdf= PolicyLog.find(:all,:select=>['policy_id as pdf'],:group=>['policy_id'])
@search= Policy.find(:all,:conditions=>['id IN (?)',@pdf.each do |a| { a.pdf} ])
,但我得到
odd number list for Hash.
unexpected ']', expecting kEND
也许还有其他的方法来搜索。
请有人可以帮助我吗?
感谢您的帮助 –