lino.utils.mti¶

A collection of tools around multi-table inheritance.

Functions

`delete_child`(obj, child_model[, ar, using])	Delete the child_model instance related to obj without deleting the parent obj itself.
`get_child`(obj, child_model)
`insert_child`(obj, child_model[, full_clean])	Create and save an instance of child_model from existing obj.
`mtichild`(p, model, **kw)	Create an MTI child, optionally set some attributes, save it to the database and then return the new database object.

Classes

`ChildCollector`(using[, origin])	A Collector that does not delete the MTI parents.
`EnableChild`(child_model, **kw)	Rendered as a checkbox that indicates whether an mti child of the given model exists.

class lino.utils.mti.ChildCollector(using, origin=None)¶

Bases: Collector

A Collector that does not delete the MTI parents.

lino.utils.mti.delete_child(obj, child_model, ar=None, using=None)¶: Delete the child_model instance related to obj without deleting the parent obj itself.

lino.utils.mti.insert_child(obj, child_model, full_clean=False, **attrs)¶

Create and save an instance of child_model from existing obj.

If full_clean is True, call full_clean on the newly created object. Default is False because this was the historic behaviour.

lino.utils.mti.mtichild(p, model, **kw)¶: Create an MTI child, optionally set some attributes, save it to the database and then return the new database object.

class lino.utils.mti.EnableChild(child_model, **kw)¶

Rendered as a checkbox that indicates whether an mti child of the given model exists.

Deprecated. Use polymorphic.Polymorphic instead.

is_enabled(lh)¶: When a FormLayout is inherited by an MTI child, EnableChild fields must be disabled.

has_child(obj, request=None)¶: Returns True if obj has an MTI child in self.child_model. The optional 2nd argument request (passed from VirtualField.value_from_object) is ignored.