在 Rails 上的 Ruby 中只有一个 model 时向多个表添加记录？

Question

I have three models clients , client_categories and clients_category_merge . I want to store clients_id and client_categories_id into clients_category_merge table, as a single client can have multiple client categories.

How do I add the record to 2 tables ( clients and clients_category_merge ) when I only have one model ( clients ) when submitting the form?

I am sure there is a good way of doing this. But I am pretty new to Rails and lost on this one.

Answer 1

The has_many:through association will add the proper records for you.

class Client < ActiveRecord::Base
  has_many :client_categories_merges
  has_many :client_categories, :through => :clients_categories_merges
end

class ClientCategories < ActiveRecord::Base
  has_many :client_categories_merges
  has_many :clients, :through => :clients_categories_merges
end

class ClientCategoryMerges < ActiveRecord::Base
  belongs_to :client_category
  belongs_to :client
end

Check out this guide

Edit : And this one for the corresponding forms