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由 Kasper Timm Hansen 提交于
By changing ActionController::Parameter's superclass, Rails 5 also changed the YAML serialization format. Since YAML doesn't know how to handle parameters it would fallback to its routine for the superclass, which in Rails 4.2 was Hash while just Object in Rails 5. As evident in the tags YAML would spit out: 4.2: !ruby/hash-with-ivars:ActionController::Parameters 5.0: !ruby/object:ActionController::Parameters Thus when loading parameters YAML from 4.2 in Rails 5, it would parse a hash dump as it would an Object class. To fix this we have to provide our own `init_with` to be aware of the past format as well as the new one. Then we add a `load_tags` mapping, such that when the YAML parser sees `!ruby/hash-with-ivars:ActionController::Parameters`, it knows to call our `init_with` function and not try to instantiate it as a normal hash subclass.
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