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relation.rb
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relation.rb
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module ROM
class Session
class Relation < ROM::Relation
include Proxy
attr_reader :relation, :tracker
public :relation, :tracker
def initialize(relation, tracker)
@relation, @tracker = relation, tracker
end
def self.build(relation, tracker, identity_map)
loader = relation.mapper.loader
dumper = relation.mapper.dumper
mapper = Session::Mapper.new(loader, dumper, identity_map)
new(relation.inject_mapper(mapper), tracker)
end
def new(*args, &block)
# FIXME: expose some nice API on the mapper to build new models
object = mapper.loader.send(:model).new(*args, &block)
track(object)
object
end
def identity(object)
dumper.identity(object)
end
def state(object)
tracker.fetch(object)
end
def track(object)
tracker.store(object, State::Transient.new(object))
self
end
def delete(object)
tracker.queue(state(object).delete(relation))
self
end
def save(object)
# TODO: should we raise if object isn't transient or dirty?
if state(object).transient? || dirty?(object)
tracker.queue(state(object).save(relation))
end
self
end
def dirty?(object)
mapper.im[identity(object)].tuple != dumper.call(object)
end
def tracking?(object)
tracker.include?(object)
end
def mapper
relation.mapper
end
def loader
mapper.loader
end
def dumper
mapper.dumper
end
end # Relation
end # Session
end # ROM