Fail on keys not specified in the rules

[rakesh-voiger]

@ozziexsh

Would be nice to have an option to fail the validation when extra keys/data present than in the rules. It will be useful in the test case assertions to ensure API does not return any unwanted/protected data. Same for incoming requests also, it would be nice to inform the client when unsupported keys are given than ignoring them.

Without option

{ok, data} = Validate.validate(%{name: "joe", age: 30}, %{name: [type: string]})

data == %{name: "joe"}

With option, something like

{:error, _} = Validate.validate(%{name: "joe", age: 30}, %{name: [type: string]}, %{unknown: :reject})
# age not allowed

Your thoughts ?

[rakesh-voiger]

seems opposite to this one. #18

how about option: unknown: with possible values :allow, :reject and :remove (:remove being default)

[ozziexsh]

I like the idea! Unfortunately I am short on time these days to implement this anytime soon, if you have the capacity feel free to open a pr

[rakesh-voiger]

I am new to elixir, but i will give it a try