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Django Migration Operations

Declarative Operation classes that record schema and data changes in Django migration files.

Field note

What it does

Migration files are composed of Operation objects that declaratively record what a migration should do to the database; Django also uses them to compute historical model state and autodetect changes.

Capabilities

Available capabilities

Declarative schema migration Migration autodetection Data migrations Data shape migration Index and constraint operations Custom operation class Model operations Field operations Schema Migrations Historical model state reconstruction

AddField

Adds a field to a model; preserve_default controls whether the default is permanent.

AlterField

Changes a field's definition on a model.

Built-in template context processors ¶

Built-in variables ¶

Configuring an engine ¶

CreateModel

Creates a new model in project history and a matching database table.

DeleteModel

Deletes the model from project history and its table from the database.

How invalid variables are handled ¶

Limitations with string literals ¶

Loading a template ¶

Overview ¶

Playing with Context objects ¶

RemoveField

Removes a field from a model.

RenameModel

Renames a model from an old name to a new one.

Rendering a context ¶

RunPython

Special operation for running Python code as a data migration.

RunSQL

Special operation for running raw SQL in a migration.