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我使用Rails 5，Rails的管理和MongoId，在我的模型，我加has_and_belongs_to_many和foreign_key並不在Rails的管理工作+ MongoID
has_and_belongs_to_many :topics, class_name: 'Topic', :foreign_key => :topicIds
它與「編輯頁面」，但不工作當我嘗試更改topicIds的值時
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.
這意味着MongoId不完全理解'：foreign_key'。你有任何想法來解決它？