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Check out quicktype.io. You can paste in your JSON and it will build your model for you. There's even an option for creating constructors. And you can choose your programming language. I usually spend some time cleaning it up a bit. It's not the perfect solution and I don't use it all the time, but it sure saves time for complicated models.
I developed a library that is better suited for such cases than plain Decodable. You can specify a path in the data and at the end of the path specify a Decodable type to be instantiated from the data.