How to use params.fetch strong parameters

Question

When using rails g scaffold kittens the strong parameters function, kitten_params is

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

I am familiar with strong parameters, params.require(:kitten).permit(:name, :age) but I'm not sure how to use the fetch method for this.

Answer 1

but I'm not sure how to use the fetch method for this

Simple. You do not use fetch for this. Since you didn't provide any properties when you created the scaffold, rails didn't know what to put into permit section and generated that code, most sensible for this situation. When you add some fields to your kitten form, upgrade kitten_params to the normal strong params "shape".

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

Answer 2

Accordingly to Documentation, you should just add .permit at the end, like:

params.fetch(:kitten, {}).permit(:name, :age)