Class AlterField
Alter a field's database column (e.g. null, max_length) to the provided new field.
Declaration
source linkDocumentation
Methods
▶ def __init__(self, model_name, name, field, preserve_default=True) override ▶ def database_backwards(self, app_label, schema_editor, from_state, to_state) overrideinherited doc Perform the mutation on the database schema in the reverse direction - e.g. if this were CreateModel, it would in fact drop the model's table.
▶ def database_forwards(self, app_label, schema_editor, from_state, to_state) overrideinherited doc Perform the mutation on the database schema in the normal (forwards) direction.
▶ def deconstruct(self) overrideinherited doc Return a 3-tuple of class import path (or just name if it lives under django.db.migrations), positional arguments, and keyword arguments.
▶ def describe(self) overrideinherited doc Output a brief summary of what the action does.
▶ def migration_name_fragment(self) override @propertyinherited doc A filename part suitable for automatically naming a migration containing this operation, or None if not applicable.
▶ def reduce(self, operation, app_label) overrideinherited doc Return either a list of operations the actual operation should be replaced with or a boolean that indicates whether or not the specified operation can be optimized across.
▶ def state_forwards(self, app_label, state) overrideinherited doc Take the state from the previous migration, and mutate it so that it matches what this migration would perform.