def lookup(cls, dataset, data, account, match_value=True, readonly=False):
data = LinkLookupSchema().to_python(data)
if match_value:
value = Value.by_value(dataset, data["key"])
if value is not None:
return value
else:
value = None
link = cls.by_key(dataset, data["key"])
if link is not None:
return link
choices = match_op(data["key"], dataset)
choices = filter(lambda (c, v, s): s > 99.9, choices)
if len(choices) == 1:
c, value, s = choices.pop()
value = Value.by_id(dataset, value)
if readonly:
return value
link = cls()
link.creator = account
link.dataset = dataset
link.value = value
link.is_matched = value is not None
link.key = data["key"]
link.data = data["data"]
db.session.add(link)
db.session.flush()
return link