bento_meta.object_map

This module contains ObjectMap, a class which provides the machinery for mapping bento_meta objects to a Bento Metamodel Database in Neo4j. Mostly not for human consumption. The ObjectMap:

• interprets the attribute specification (attspec) and map specification (mapspec) associated with Entity subclasses

• provides the get() and put() methods to subclasses, that enable them to get and put themselves to the database

• generates appropriate Cypher queries to do gets and puts

One ObjectMap instance should be generated for each Entity subclass (see, e.g., bento_meta.model.Model)

Module Contents

Classes

ObjectMap

This module contains ObjectMap, a class which provides the

class bento_meta.object_map.ObjectMap(*, cls=None, drv=None)

Bases: object

This module contains ObjectMap, a class which provides the machinery for mapping bento_meta objects to a Bento Metamodel Database in Neo4j. Mostly not for human consumption.

cache

classmethod clear_cache()

classmethod cls_by_label(lbl)

classmethod keys_by_cls_and_reln(qcls, reln)

classmethod _quote_val(value, single=None)

get_by_id(obj, id, refresh=False)

Get an entity given an id attribute value (not the Neo4j id)

get_by_node_nanoid(obj, nanoid, refresh=False)

PROTOTYPE Get an entity given an id attribute value (not the Neo4j id)

get(obj, refresh=False)

Get the data for an object instance from the db and load the instance with it

put(obj)

Put the object instance’s attributes to the mapped data node in the database

rm(obj, force=False)

‘Delete’ the object’s mapped node from the database

add(obj, att, tgt)

Create a link between an object instance and a target object in the database. This represents adding an object-valued attribute to the object.

drop(obj, att, tgt, tx=None)

Remove an existing link between an object instance and a target object in the database. This represents dropping an object-valued attribute from the object.

get_owners(obj)

Get the nodes which are linked to the object instance (the owners of the object)

get_q(obj)

get_by_id_q()

get_by_node_nanoid_q()

PROTOTYPE

get_attr_q(obj, att)

get_owners_q(obj)

put_q(obj)

put_attr_q(obj, att, values)

rm_q(obj, detach=False)

rm_attr_q(obj, att, values=None)

_check_values_list(att, values)