lino.core.ddh¶
Defines the DisableDeleteHandler
class.
See Deleting database objects.
(This module's source code is available here.)
Classes
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A helper object used to find out whether a known object can be deleted or not. |
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class
lino.core.ddh.
DisableDeleteHandler
(model)¶ Bases:
object
A helper object used to find out whether a known object can be deleted or not.
Lino installs an instance of this on each model in an attribute _lino_ddh during kernel startup.
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fklist
¶ A list of tuples (model, fk), one item for each FK field in the application which points to this model.
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model
¶ The owning model (i.e.
m._lino_ddh.model is m
is True for every model)
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disable_delete_on_object
(obj, ignore_models={})¶ Return a veto message which explains why this object cannot be deleted. Return None if there is no veto.
If ignore_model (a set of model class objects) is specified, do not check for vetos on ForeignKey fields defined on one of these models.
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