django.db.migrations.operations.fields.FieldOperation

class documentation

class FieldOperation(Operation):

Known subclasses: django.db.migrations.operations.AddField, django.db.migrations.operations.AlterField, django.db.migrations.operations.RemoveField, django.db.migrations.operations.RenameField

View In Hierarchy

Undocumented

Method	`__init__`	Undocumented
Method	`is_same_field_operation`	Undocumented
Method	`is_same_model_operation`	Undocumented
Method	`reduce`	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.
Method	`references_field`	Return True if there is a chance this operation references the given field name, with an app label for accuracy.
Method	`references_model`	Return True if there is a chance this operation references the given model name (as a string), with an app label for accuracy.
Instance Variable	`field`	Undocumented
Instance Variable	`model_name`	Undocumented
Instance Variable	`name`	Undocumented
Property	`model_name_lower`	Undocumented
Property	`name_lower`	Undocumented

Inherited from Operation:

Method	`__new__`	Undocumented
Method	`__repr__`	Undocumented
Method	`allow_migrate_model`	Return whether or not a model may be migrated.
Method	`database_backwards`	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.
Method	`database_forwards`	Perform the mutation on the database schema in the normal (forwards) direction.
Method	`deconstruct`	Return a 3-tuple of class import path (or just name if it lives under django.db.migrations), positional arguments, and keyword arguments.
Method	`describe`	Output a brief summary of what the action does.
Method	`state_forwards`	Take the state from the previous migration, and mutate it so that it matches what this migration would perform.
Class Variable	`atomic`	Undocumented
Class Variable	`elidable`	Undocumented
Class Variable	`reduces_to_sql`	Undocumented
Class Variable	`reversible`	Undocumented
Class Variable	`serialization_expand_args`	Undocumented
Instance Variable	`_constructor_args`	Undocumented
Property	`migration_name_fragment`	A filename part suitable for automatically naming a migration containing this operation, or None if not applicable.

def __init__(self, model_name, name, field=None):

overridden in django.db.migrations.operations.AddField, django.db.migrations.operations.AlterField, django.db.migrations.operations.RenameField

Undocumented

def is_same_field_operation(self, operation):

Undocumented

def is_same_model_operation(self, operation):

Undocumented

def reduce(self, operation, app_label):

overrides django.db.migrations.operations.base.Operation.reduce

overridden in django.db.migrations.operations.AddField, django.db.migrations.operations.AlterField, django.db.migrations.operations.RemoveField, django.db.migrations.operations.RenameField

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 references_field(self, model_name, name, app_label):

overrides django.db.migrations.operations.base.Operation.references_field

overridden in django.db.migrations.operations.RenameField

Return True if there is a chance this operation references the given field name, with an app label for accuracy.

Used for optimization. If in doubt, return True.

def references_model(self, name, app_label):

overrides django.db.migrations.operations.base.Operation.references_model

Return True if there is a chance this operation references the given model name (as a string), with an app label for accuracy.

Used for optimization. If in doubt, return True; returning a false positive will merely make the optimizer a little less efficient, while returning a false negative may result in an unusable optimized migration.

field =

Undocumented

model_name =

Undocumented

name =

Undocumented

@cached_property
model_name_lower =

Undocumented

@cached_property
name_lower =

Undocumented