activeadmin和acts_as_taggable_on生成ambiguous_column_name错误

我正在使用active_admin和acts_As_taggable_on，我试图做一个过滤器。下面是型号代码：activeadmin和acts_as_taggable_on生成ambiguous_column_name错误

class Person < ApplicationRecord 
    acts_as_taggable_on :expertise, :industry 
end

这里是过滤器：

filter :industry, as: :select, collection: Person.industry_counts.pluck(:name, :name)

，这里是错误提交过滤器时，我得到：

SQLite3::SQLException: ambiguous column name: created_at: SELECT COUNT(DISTINCT "people"."id") FROM "people" LEFT OUTER JOIN "taggings" ON "taggings"."taggable_id" = "people"."id" AND "taggings"."context" = ? AND "taggings"."taggable_type" = ? WHERE "taggings"."tag_id" = 0 AND (created_at > '2017-01-17 00:22:53.923894')

我该如何解决这个问题？

来源

2017-01-24 Philip7899

问题是'created_at>'2017-01-17 00：22：53.923894'' 'created_at'存在于'taggings'和'people'上 – TheRealMrCrowley

你可以发布代码的调用吗？似乎缺少某些东西 – TheRealMrCrowley

事实证明，active_admin使用ransack gem来处理它的过滤器。我不得不做出定制“ransackers”的模式，使这项工作：

def self.in_industry(industries) 
    Person.tagged_with(industries, :any => true, :on => :industry).select{|a| a} #use select to convert relation to array 
end 

ransacker :by_industry, formatter: proc{ |v| 
    data = Person.in_industry(v).map(&:id) 
    data = data.present? ? data : nil 
} do |parent| 
    parent.table[:id] 
end

我得到这个从下面的文章和更正的意见中提出：

http://nikhgupta.com/code/activeadmin/custom-filters-using-ransacker-in-activeadmin-interfaces/

来源

2017-02-06 23:12:37 Philip7899

activeadmin和acts_as_taggable_on生成ambiguous_column_name错误

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