Ruby on rails 使用Active Admin设置多通过滤器

我试图简单地允许在ActiveAdmin的位置页面上过滤类别

我有三种型号：

class Location < ActiveRecord::Base
  has_many :categories_locations
  has_many :categories, :through => :categories_locations

class CategoriesLocation < ActiveRecord::Base
    belongs_to :category
    belongs_to :location
end

class Category < ActiveRecord::Base
    has_many :categories_locations
    has_many :locations, :through => :categories_locations
end

但是，它不断抛出一个错误

undefined method `category_eq' for #<MetaSearch::Searches::Location:0x007fd4f9b965d8>

未定义的方法'category_eq'#

我尝试过filter:categories，filter:categories\u Location，但没有任何效果

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有人经历过这种情况吗？有人有解决方案吗？

为什么不使用habtm

class Location < ActiveRecord::Base
  has_and_belongs_to_many :categories

class CategoriesLocation < ActiveRecord::Base
end

class Category < ActiveRecord::Base
    has_and_belongs_to_many :locations
end

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在某些情况下，has\u many/through比habtm更灵活（您可以有其他字段等）

如果您可以在sql中编写has many，可以在此处找到答案

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我也在寻找相同的解决方案，并找到了如下工作方案。在这里发布，以便将来帮助他人

app/admin/location.rb

ActiveAdmin.register Location do
  filter :filter_by_category, label: 'Category', as: :select, collection: Category.pluck(:name, :id)

class Location < ActiveRecord::Base
  has_many :categories_locations
  has_many :categories, :through => :categories_locations

  def self.filter_by_category(category_id)
    category_id = 1 if category_id == true # this is required only for id=1, ActiveAdmin return it as `true`
    joins(:categories).where("categories.id = ?", category_id)
  end

  #  Add your custom method as ransack 
  def self.ransackable_scopes(_auth_object = nil)
    [:filter_by_category]
  end
end

app/model/location.rb

ActiveAdmin.register Location do
  filter :filter_by_category, label: 'Category', as: :select, collection: Category.pluck(:name, :id)

class Location < ActiveRecord::Base
  has_many :categories_locations
  has_many :categories, :through => :categories_locations

  def self.filter_by_category(category_id)
    category_id = 1 if category_id == true # this is required only for id=1, ActiveAdmin return it as `true`
    joins(:categories).where("categories.id = ?", category_id)
  end

  #  Add your custom method as ransack 
  def self.ransackable_scopes(_auth_object = nil)
    [:filter_by_category]
  end
end

类位置：类别\u位置
按类别定义自我筛选（类别id）
category_id=1如果category_id==true#这仅对id=1是必需的，ActiveAdmin将其作为“true”返回`
连接（：categories）。其中（“categories.id=？”，categories\u id）
结束
#将自定义方法添加为ransack
定义自身可搜索范围（_auth_object=nil）
[：按类别过滤]
结束
结束

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希望对你有帮助

我也有同样的问题，我不能从habtm转到HASU many/through，所以有什么真正的解决办法吗？