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from django.db.utils import DatabaseError
class AmbiguityError(Exception):
"""More than one migration matches a name prefix."""
pass
class BadMigrationError(Exception):
"""There's a bad migration (unreadable/bad format/etc.)."""
pass
class CircularDependencyError(Exception):
"""There's an impossible-to-resolve circular dependency."""
pass
class InconsistentMigrationHistory(Exception):
"""An applied migration has some of its dependencies not applied."""
pass
class InvalidBasesError(ValueError):
"""A model's base classes can't be resolved."""
pass
class IrreversibleError(RuntimeError):
"""An irreversible migration is about to be reversed."""
pass
class NodeNotFoundError(LookupError):
"""An attempt on a node is made that is not available in the graph."""
def __init__(self, message, node, origin=None):
self.message = message
self.origin = origin
self.node = node
def __str__(self):
return self.message
def __repr__(self):
return "NodeNotFoundError(%r)" % (self.node,)
class MigrationSchemaMissing(DatabaseError):
pass
class InvalidMigrationPlan(ValueError):
pass