class Decidim::Meetings::Calendar::BaseCalendar

include your new class.
it. After that, modify the ‘Decidim::Meetings::Calendar.for` method to
from it and overwrite the `events` with whatever logic you need to do
This class serves as a base class to render calendars. Please, inherit

def self.for(resource, filters = nil)

Returns a String.

resource - a resource that has meetings.

meetings to the ICalendar format.
Convenience method to shorten the calls. Converts the resource 
def self.for(resource, filters = nil)
  new(resource, filters).calendar
end

def calendar

Returns a String.

Converts the resource meetings to the ICalendar format. 
def calendar
  return if events.blank?
  <<~CALENDAR.gsub("\n\n", "\n")
    BEGIN:VCALENDAR\r
    VERSION:2.0\r
    PRODID:icalendar-ruby\r
    CALSCALE:GREGORIAN\r
    #{events}
    END:VCALENDAR\r
  CALENDAR
end

def events

Returns a String.

example of how to achieve it.
you can cache its contents. Check existing implementations for an
`MeetingToEvent` class to do so. Since this method returns a String,
will be exported, and convert them to ICalendar events. Please use the
inheriting from this one. It should find the relevant meetings that
Internal: this method is supposed to be overwritten by classes 
def events
  raise "Please, overwrite this method. You can use the `MeetingToEvent` class to convert a meeting to the correct ICalendar format."
end

def initialize(resource, filters = nil)

resource - a resource that has meetings.

Initializes the class. 
def initialize(resource, filters = nil)
  @resource = resource
  @filters = filters
end