Question

我有一个属于公司的模型CompanyBranch：

class CompanyBranch < ActiveRecord::Base
  belongs_to :company
  ...
end

公司有一个属性“category_id”。现在我想通过公司的category_id来确定CompanyBranch的范围。像这样：

scope :category, -> (category_id) { where company.category_id: category_id }

但那不起作用。什么是正确的方法呢？

Answer 1

class CompanyBranch < ActiveRecord::Base
    belongs_to :company
    scope :by_category, -> (cat) { joins(:companies).where(companies: {category: cat}) }
    # ...
end

Answer 2

您还必须将其加入类别表，如下所示：

  scope :category, lambda { | category_id | joins("INNER JOIN categories on company_branches.category_id = categories.id").where("company.category_id: category_id)", category_id) }

belongs_to对象中属性的范围

2 个答案: