我正在使用Rails 5，Rails Admin和MongoId，在我的模型中，我添加了
has_and_belongs_to_many :topics, class_name: 'Topic', :foreign_key => :topicIds
它适用于“编辑页面”，但在我尝试更改topicIds的值时不起作用
message: Attempted to set a value for 'topic_ids' which is not allowed on the model AppUser. summary: Without including Mongoid::Attributes::Dynamic in your model and the attribute does not already exist in the attributes hash, attempting to call AppUser#topic_ids= for it is not allowed. This is also triggered by passing the attribute to any method that accepts an attributes hash, and is raised instead of getting a NoMethodError. resolution: You can include Mongoid::Attributes::Dynamic if you expect to be writing values for undefined fields often.
这意味着MongoId并不完全理解'：foreign_key'。你有什么想法来解决它吗？
答案 0 :(得分：0)
我通过在模型中添加别名字段来解决我的问题：
field :topicIds, type: Array, :as => :topic_ids