Question

我有以下配置，我正在尝试编写一个范围来给我所有订单，其中order.buying_store.name等于搜索词，或者order.buying_store.company.name等于相同的搜索词。我写的范围正在产生错误：

ActiveRecord::StatementInvalid: PG::UndefinedTable: ERROR:  missing FROM-clause entry for table "company"

我的设置：

class Company
  has_many :stores
end 

class Store
  belongs_to :company
end

class Order
  belongs_to :buying_store, class_name: 'Store', foreign_key: 'buying_store_id', required: true 
  belongs_to :selling_store, class_name: 'Store', foreign_key: 'selling_store_id', required: true

  scope :with_buying_counterpart_like, ->(search_term) { joins(:buying_store).where(['buying_store.name = ? OR buying_store.company.name = ?', search_term, search_term]) }

end

我也尝试过：

  scope :with_buying_counterpart_like, ->(search_term) { joins(:buying_store, :company).where(['buying_store.name = ? OR company.name = ?', search_term, search_term]) }

但会产生以下错误：

ActiveRecord::ConfigurationError: Can't join 'Order' to association named 'company'; perhaps you misspelled it?

Answer 1

您在范围内使用公司，但您没有加入表公司尝试类似的东西

class Order
  with_options class_name: 'Store', required: true  do
    belongs_to :buying_store, foreign_key: 'buying_store_id'
    belongs_to :selling_store, foreign_key: 'selling_store_id'
  end

  scope :with_buying_counterpart_like, (lambda do |search_term| 
    joins(buying_store: :company)
      .where('stores.name = :term OR companies.name = :term', term: search_term)
  end)    
end

Answer 2

ActiveRecord :: ConfigurationError：无法将“订单”加入关联命名为“公司”;也许你拼错了？

你的第二种方法是正确的，但有缺陷。你需要像下面那样

scope :with_buying_counterpart_like, ->(search_term) { joins(buying_store: [:company]).where(['buying_store.name = ? OR company.name = ?', search_term, search_term]) }

也就是说，您需要company 嵌套与buying_store，因为Order和Comapny之间没有关联

<强>更新

在编写where的字符串表示法时，您需要编写完整的表名而不是关联名，所以最后的查询将是

scope :with_buying_counterpart_like, ->(search_term) { joins(buying_store: [:company]).where(['stores.name = ? OR companies.name = ?', search_term, search_term]) }

访问多个表的范围

2 个答案: