ruby-on-rails - rails : How to create has_many through relationships via the ids in the model?

Question

我有三个模型:Customer、Branch 和 CustomerBranch

在客户模型中:

has_many :customer_branches, inverse_of: :customer
has_many :branches, through: :customer_branches

在分支模型中:

has_many :customer_branches, inverse_of: :branch, dependent: :restrict_with_exception
has_many :customers, through: :customer_branches

在 CustomerBranch 模型中:

belongs_to :customer, inverse_of: :customer_branches
belongs_to :branch, inverse_of: :customer_branches

这是一个仅 API 的应用程序，我将获得一组分支 id。现在我想根据收到的 ID 为客户分配/删除分支。

我有一个解决方案来处理这个问题，但我认为这不是最好的方法。这是我当前的解决方案:

attr_accessor :branches_ids
after_save :assign_branches

def assign_branches
  return if self.branches_ids.nil?
  old_branch_ids = self.branch_ids

  remove_branch_ids = old_branch_ids - self.branches_ids

  self.customer_branches.where(id: remove_branch_ids).delete_all if remove_branch_ids.present?

  self.branches << Branch.where(id: self.branches_ids)
end

有没有更好的方法来处理这个问题？预先感谢!

Answer 1

好啦，回答一下问题。您可以直接在客户上设置 ID:

customer = Customer.find(1)
customer.branches_ids = [1,2,3]

Rails 将处理所有添加和删除。

还与新客户合作:

customer = Customer.new
customer.name = "blabla"
customer.branches_ids = [1,2,3]
customer.save