Hi all
I've been playing with DataMapper in Merb and Sinatra and I've got a
question... Is there any equivalent to the ActiveRecord's after_add
hook? I want to update a property on an object when something is added
to its "has, n" collection.
Slightly simplified models:
class Story
include DataMapper::Resource
property :id, Serial
property :finished, Boolean, :default => false
has 1..4, :parts
end
class Part
include DataMapper::Resource
property :id, Serial
belongs_to :story
end
When a Story has 4 Parts it is finished and I want to mark it as such.
I've tried adding after :save to Story but that doesn't seem to get
called when a Part is added. I've tried adding after :save to Part, to
check whether it is the 4th Part of its parent Story but while that
gets called, it's been problematic. Here's what I've tried in the Part
model:
after :save do
if story.parts.count == 4
story.finished = true
story.save
end
end
Doesn't seem to change the story.
after :save do
if story.parts.count == 4
s = Story.get(story.id)
s.finished = true
s.save
end
end
Produces a "stack level too deep" trace.
after :save do
if story.parts.count == 4
story.attribute_set(:finished, true)
end
end
Doesn't seem to change the story.
What am I doing wrong? Or is there another way around?
Any help much appreciated...
Mike
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