How to add multiple conditions to Rails scope?

I've been looking for this for a while and can't seem to find an answer, although I think that it should be a pretty easy fix if you're more experienced with Rails than I am. I am trying to add multiple default_scope conditions to my Product model. My product model file is as follows:

class Product < ApplicationRecord
    has_many :order_items
    default_scope { where(active: true) }
    validates :name,  presence: true, length: { maximum: 300 }
    PRICE_REGEXP = /\A\d{1,4}(\.\d{0,2})?\z/
    validates :price, presence: true,
                      numericality: true,
                      format: { with: PRICE_REGEXP }
    validates :description, presence: true, length: { maximum: 1000 }, 
                            allow_nil: true
end

I would like to also add

default_scope -> { order(created_at: desc) }

so that new products on the product index page are in the format of newest first. I get an syntax error message anytime I do something like:

default_scope -> { order(created_at: desc) }, { where(active: true) }

or

default_scope -> { order(created_at: desc), where(active: true) }

or

default_scope -> { order(created_at: desc) where(active: true) }

I know that this is probably just a syntax thing that I'm not understanding. If anyone could give me advice on how to fix this it would be greatly appreciated! Thanks!

I think what you are trying to do is this

default_scope -> { where(active: true).order(created_at: :desc)  }

So effectively you just had a syntax issue. When they added the new lambda scope syntax to rails it was a little unfamiliar to a lot of ruby developers due to its functional programming origins (given rails is object oriented language). Effectively the segment of code in {} acts like a block and executes the code inside. The where clause gets implicitly called on the model the scope is declared in. That where clause returns a ActiveRecord relation object (that is a collection of database records) which implements the order method that will sort the records in the relation by the attribute that is passed (in this case created_at) in descending (desc) or ascending (asc) order based on the parameter passed in.