as title, I have product & order model with nested relationship, like:
resources :products do
resources :orders
end
Products has a filed, it name is 'amount', for example is 5.
how can I limit orders total counts less than or equal to 5?
I don't know how to use parent keyword in order model. Who can help me? thanks.
I need a resolution, thanks.
We can act in this way. Here, I'll give you an answer in the form of a piece of code. You can test the code below, where I've created a method to handle this limit.
class Order < ApplicationRecord
# association
belongs_to :product
# create callback
before_create :check_order_limit
private
# created method which is called before creation
def check_order_limit
errors.add(:base, 'Oops, Limit Exceeded!') if product.orders.size >= product.amount
end
end
