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from django.db.migrations.operations.base import Operation
class ApplyState(Operation):
"""Takes an abritrary operation and migrates the project state but does not
apply the operation to the database.
This is very similar to the :see:RunSQL `state_operations`
parameter. This is useful if you want to tell Django that an
operation was applied without actually applying it.
"""
reduces_to_sql = False
def __init__(self, state_operation: Operation) -> None:
self.state_operation = state_operation
def deconstruct(self):
kwargs = {"state_operation": self.state_operation}
return (self.__class__.__qualname__, [], kwargs)
@property
def reversible(self):
return True
def state_forwards(self, app_label, state):
self.state_operation.state_forwards(app_label, state)
def state_backwards(self, app_label, state):
self.state_operation.state_backwards(app_label, state)
def database_forwards(self, app_label, schema_editor, from_state, to_state):
pass
def database_backwards(
self, app_label, schema_editor, from_state, to_state
):
pass
def describe(self):
return "Apply state: " + self.state_operation.describe()
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