I've worked out a solution. It might not be the neatest, but it works
for me:
has_many has its own call backs. So I can trigger a logging activity
using the 'after_remove' call back like this:
has_many :users, :after_remove => :log_removal
I am then able to grab the Observe object using ObjectSpace:
def get_an_active_activity_logger
active_loggers = Array.new
ObjectSpace.each_object(ActivityLogger){|l| active_loggers << l}
@activity_logger = active_loggers.first
end
And call one of @activity_logger's public methods to generate the log.
def log_removal(item)
get_an_active_activity_logger
@activity_logger.log_activity(
self,
'item_removal',
"#{item.class.name} #{item.id} removed from association"
)
end
It means I have to update each of my has_many calls and make the
log_removal and get_an_active_activity_logger methods available to the
models where they are needed, but both of those are fairly trivial
tasks.
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