How to use rails undefined method `attr_accessible' in version 4 +

See more:

Ruby

Rails

I am new on rails. Below is what i am trying

class Category < ActiveRecord::Base
    attr_accessible :name
    has_many :post
end

class Post < ActiveRecord::Base
	attr_accessible :title, :body, :category_id, :author_id
	belongs_to :category
end


but i am not sure how to use attr_accessible in rails 4+ in my above scnerio . I was doing as per old .Please suggest

def category_params
params.require(:category).permit(:name)
end
this is i found how to use it , but not sure where to use has many attribute then ?