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由 Gaurish Sharma 提交于
Done the following changes: 1. Replace uniq call in example with autosave as uniq is not supported on has_and_belongs_to_many 2. Add :readonly option to list of supported call as per [EdgeApi](http://edgeapi.rubyonrails.org/classes/ActiveRecord/Associations/ClassMethods.html#method-i-has_and_belongs_to_many)
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