def changeset(self, database, start, end=None):
"""Create a changeset to migrate this database from ver. start to end/latest.
:param database: name of database to generate changeset
:param start: version to start at
:param end: version to end at (latest if None given)
:type database: string
:type start: int
:type end: int
:returns: :class:`Changeset instance <migration.versioning.repository.Changeset>`
"""
start = version.VerNum(start)
if end is None:
end = self.latest
else:
end = version.VerNum(end)
if start <= end:
step = 1
range_mod = 1
op = 'upgrade'
else:
step = -1
range_mod = 0
op = 'downgrade'
versions = range(int(start) + range_mod, int(end) + range_mod, step)
changes = [self.version(v).script(database, op) for v in versions]
ret = Changeset(start, step=step, *changes)
return ret
def __init__(self, start, *changes, **k):
"""
Give a start version; step must be explicitly stated.
"""
self.step = k.pop('step', 1)
self.start = version.VerNum(start)
self.end = self.start
for change in changes:
self.add(change)
def changeset(self, database, start, end=None):
"""
Create a changeset to migrate this dbms from ver. start to end/latest.
"""
start = version.VerNum(start)
if end is None:
end = self.latest
else:
end = version.VerNum(end)
if start <= end:
step = 1
range_mod = 1
op = 'upgrade'
else:
step = -1
range_mod = 0
op = 'downgrade'
versions = range(start + range_mod, end + range_mod, step)
changes = [self.version(v).script(database, op) for v in versions]
ret = Changeset(start, step=step, *changes)
return ret
