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- from django.db 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
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