ontology.models.relations module¶

class ontology.models.relations.RelationAsym(*args, **kwargs)[source]¶

Bases: django.db.models.base.Model

An asymmetric Relation between two Topics.

A¶

Accessor to the related object on the forward side of a many-to-one or one-to-one (via ForwardOneToOneDescriptor subclass) relation.

In the example:

class Child(Model):
    parent = ForeignKey(Parent, related_name='children')

Child.parent is a ForwardManyToOneDescriptor instance.

relation¶: A wrapper for a deferred-loading field. When the value is read from this object the first time, the query is executed.

B¶

Accessor to the related object on the forward side of a many-to-one or one-to-one (via ForwardOneToOneDescriptor subclass) relation.

In the example:

class Child(Model):
    parent = ForeignKey(Parent, related_name='children')

Child.parent is a ForwardManyToOneDescriptor instance.

exception DoesNotExist¶: Bases: django.core.exceptions.ObjectDoesNotExist

exception MultipleObjectsReturned¶: Bases: django.core.exceptions.MultipleObjectsReturned

get_relation_display(*, field=<django.db.models.fields.CharField: relation>)¶

id¶: A wrapper for a deferred-loading field. When the value is read from this object the first time, the query is executed.

class ontology.models.relations.RelationSym(*args, **kwargs)[source]¶

Bases: django.db.models.base.Model

A symmetric relation between multiple Topics.

topics¶

Accessor to the related objects manager on the forward and reverse sides of a many-to-many relation.

In the example:

class Pizza(Model):
    toppings = ManyToManyField(Topping, related_name='pizzas')

Pizza.toppings and Topping.pizzas are ManyToManyDescriptor instances.

Most of the implementation is delegated to a dynamically defined manager class built by create_forward_many_to_many_manager() defined below.

relation¶: A wrapper for a deferred-loading field. When the value is read from this object the first time, the query is executed.

exception DoesNotExist¶: Bases: django.core.exceptions.ObjectDoesNotExist

exception MultipleObjectsReturned¶: Bases: django.core.exceptions.MultipleObjectsReturned

get_relation_display(*, field=<django.db.models.fields.CharField: relation>)¶

id¶: A wrapper for a deferred-loading field. When the value is read from this object the first time, the query is executed.