How to permit hash with rails strong params-CodePudding

I am working on a Model with an atter_accessor object named element. I want to pass the Array of form data to the element object. In Rails console I am getting Unpermitted parameter error.

Parameters: {"authenticity_token"=>"[FILTERED]", "category"=>{"name"=>"asfd", "body"=>"asf", "element"=>{"1"=>"asfd:text", "2"=>"asfd:text", "3"=>"asfd:text"}}, "type"=>"text", "commit"=>"Create Category"}
Unpermitted parameter: :element. Context: { controller: CategoriesController, action: create, request: #<ActionDispatch::Request:0x0000000106b3ff68>, params: {"authenticity_token"=>"[FILTERED]", "category"=>{"name"=>"asfd", "body"=>"asf", "element"=>{"1"=>"asfd:text", "2"=>"asfd:text", "3"=>"asfd:text"}}, "type"=>"text", "commit"=>"Create Category", "controller"=>"categories", "action"=>"create"} }

In model attr_accessor :elements

In controller

def category_params
  params.require(:category).permit(:name, :body, :elements => []) 
end

I tried with many alternatives changing the :elements to element: [] too, nothing worked. I think I am missing something here which is the reason I am getting an unpermitted parameters.

CodePudding user response：

You haven't mentioned the version of rails you are using but, :elements => [] does not work because elements is a ruby hash and not an array

on rails 5.1 you can use

params.require(:category).permit(:name, :body, :elements => {})