class Decidim::Meetings::Admin::MeetingRegistrationsForm

This class holds a Form to update meeting registrations from Decidim’s admin panel.

def available_slots_greater_than_or_equal_to_registrations_count 

def available_slots_greater_than_or_equal_to_registrations_count
  errors.add(:available_slots, :invalid) if available_slots < meeting.registrations.count
end

def id

TL;DR: if you remove this method, we'll get errors, so don't.

for the controller we're using.
`create` action, thus raising an error since this action is not defined
method will return an empty string and Rails will treat this as a
to resubmit the form, the form will not hold an ID, so the `to_param`
If we remove this method, get an error onn the `update` action and try
and thus its `to_param` method will always return a significant value.
We need this method to ensure the form object will always have an ID, 
def id
  return super if super.present?
  meeting.id
end

def meeting 

def meeting
  @meeting ||= context[:meeting]
end

def reserved_slots_lower_than_or_equal_to_rest_available_slots_and_registrations_count 

def reserved_slots_lower_than_or_equal_to_rest_available_slots_and_registrations_count
  total_slots = available_slots - meeting.registrations.count
  errors.add(:reserved_slots, I18n.t("decidim.meetings.admin.registrations.form.reserved_slots_less_than", count: total_slots)) if reserved_slots > total_slots
end