The data copied from the existing table to the new table. Migration directives within the batch, using a temporary name. Modes of table migration, in particular the “recreate” style ofĪ new table is created with the new specification, based on the To be syntactically grouped together, and allows for alternate Invoke a series of per-table migrations in batch.īatch mode allows a series of operations specific to a table batch_alter_table ( table_name : str, schema : str | None = None, recreate : Literal = 'auto', partial_reordering : tuple | None = None, copy_from : Table | None = None, table_args : Tuple = (), table_kwargs : Mapping =, naming_convention : Dict | None = None ) → Iterator ¶ AbstractOperations ( migration_context : MigrationContext, impl : BatchOperationsImpl | None = None ) ¶īase class for Operations and BatchOperations. Itself would be invoked by the n_migrations() Under normalĬircumstances they are called from an actual migration script, which The functions here all require that a MigrationContext has beenĬonfigured within the env.py script first, which is typically Objects, though the table metadata is still generated here. Rule include the add_column() and create_table() Given in terms of just the string names and/or flags involved. This so that migration instructions can be To the greatest degree possible, they internally generate theĪppropriate SQLAlchemy metadata, typically involving SeeĪ key design philosophy to the Operation Directives methods is that The Operations system is also fully extensible. So symbols can be imported safely from the alembic.op namespace. With individual proxies for each method on Operations, To the script via the alembic.op datamember, which isĪ proxy to an actual instance of Operations.Ĭurrently, alembic.op is a real Python module, populated When migration scripts are run, this object is made available Within the upgrade() and downgrade() functions, as well asĪll directives exist as methods on a class called Operations. The directives here are used within user-defined migration files, This file provides documentation on Alembic migration directives.
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