Currently strong_parameters do not allow you to overload keys in permitted
parameters. I am proposing a change that allows you to accept scalar
values, arrays, or a hash of parameters for a particular permitted key,
instead of exclusively one of the three.
This is allowed by passing an array with multiple of the same key with
different values. For example: `user: [:name, {:name => []}, {:name =>
[:first, :middle]}]`.
The particular case that this addresses for me is that I have a polymorphic
object whose attributes can either be a scalar value or another rails
model. This solution allows me to provide one permitted parameters hash to
accept all possible types of the polymorphic object without having to
condition on the parameters themselves.
You can take a look at the code I have written to solve this problem here:
https://github.com/pblesi/rails/commit/1ce634e9990b9b5397b7e5e6aa265ed0410379fc
I appreciate any feedback on the proposed solution.
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