ruby on rails - How to use params.fetch strong parameters -


when using rails g scaffold kittens strong parameters function, kitten_params is

def kitten_params   params.fetch(:kitten, {}) end

i familiar strong parameters, params.require(:kitten).permit(:name, :age) i'm not sure how use fetch method this.

but i'm not sure how use fetch method this

simple. not use fetch this. since didn't provide properties when created scaffold, rails didn't know put permit section , generated code, sensible situation. when add fields kitten form, upgrade kitten_params normal strong params "shape".

params.require(:kitten).permit(:name, :age)

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