class Entry(Entity):
has_field('title', Unicode(255), unique=True, required=True)
has_and_belongs_to_many('tags', unique=True, of_kind='Tag',
inverse='ideas')
def __repr__(self):
return '<Idea "%s">' % (self.title,)
class Tag(Entity):
has_field('tag', Unicode(50), unique=True, required=True)
has_and_belongs_to_many('ideas', of_kind='Idea', inverse='tags')
With the above code how can i assert that Tags can only be added once
to an Entry?
t = model.Tag(tag="test")
t1 = model.Tag(tag="secret")
model.entry.append(t)
model.entry.appen(t1)
now i would expect the following to cause an error or prevent it
somehow:
model.entry.append(t)
because entry has Tag t already and it makes no sense to append it
once more.
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