process_webhook method for Stripe returning nil value for customer

[noleftsignal]

During rspec test for processing stripe webhook events, this method:

def self.process_webhook(type, data)
    account = Account.find_by!(stripe_customer_id: data["object"]["customer"])
    account.subscription_events.create(
      type: type,
      data: data,
    )

    if type == "customer.subscription.updated"
      handle_subscription_updated_event(account, data)
    end
  end

is returning this error:

Failure/Error: account = Account.find_by!( stripe_customer_id: data[:object][:customer] )
     
     NoMethodError:
       undefined method '[]' for nil:NilClass

Not sure if it is a result of not being able to parse the returned data from Stripe properly when converted to a hash with this line in the receive method of the stripe_webhooks_controller:
params[:data].permit!.to_h
or if it's an update to Stripe's API that's causing the issue now. I was able to nail it down to this line specifically in the subscription_event.rb model:
account = Account.find_by!(stripe_customer_id: data["object"]["customer"])
And by changing it to:
account = Account.find_by!( { 'stripe_customer_id': data['object']['customer'] } )
I was able to get the tests to pass.
Any info on why the lesser intuitive nature of the latter works and the former does not would be greatly appreciated to better grasp the concept!

[radar]

It's probably a recent Rails version change that has caused this. I am not sure what it could be.

Regarding that final line, I think you could simplify it to:

account = Account.find_by!(stripe_customer_id: data.dig('object', 'customer'))

And it would still work then. There is no need to quote stripe_customer_id there, as it will end up being the same symbol as the unquoted version:

irb(main):001:0> h = { 'stripe_customer_id': 1 }
=> {:stripe_customer_id=>1}
irb(main):002:0> h.keys.first
=> :stripe_customer_id

[radar]

@noleftsignal What version of Rails are you using for this?