Module utils

Functions

• ▶ def field_is_referenced(state, model_tuple, field_tuple)

  Return whether `field_tuple` is referenced by any state models.

  source link

  Reexports

  • Imported in django.db.migrations.operations.fields.
• ▶ def field_references(model_tuple, field, reference_model_tuple, reference_field_name=None, ...)

  Return either False or a FieldReference if `field` references provided context.

  def field_references(

  model_tuple,

  field,

  reference_model_tuple,

  reference_field_name=None,

  reference_field=None,

  )

  source link

  False positives can be returned if `reference_field_name` is provided
  without `reference_field` because of the introspection limitation it
  incurs. This should not be an issue when this function is used to determine
  whether or not an optimization can take place.

  Reexports

  • Imported in django.db.migrations.operations.fields.
  • Imported in django.db.migrations.operations.models.
• ▶ def get_references(state, model_tuple, field_tuple=())

  Generator of (model_state, name, field, reference) referencing provided context.

  source link

  If field_tuple is provided only references to this particular field of
  model_tuple will be generated.

  Reexports

  • Imported in django.db.migrations.operations.fields.
  • Imported in django.db.migrations.operations.models.
• ▶ def resolve_relation(model, app_label=None, model_name=None)

  Turn a model class or model reference string and return a model tuple.

  source link

  app_label and model_name are used to resolve the scope of recursive and
  unscoped model relationship.

  Reexports

  • Imported in django.db.migrations.operations.models.

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