def remove(self, first, second, relation_type):
"""Remove the relation between the first and the second."""
self._validate_relation_type(relation_type)
sr = SiblingsRelation(relation_type)
sr.remove(pid=second.pid)
# remove any metadata for this relation, if any
# both first and second could have metadata for the relation
RecordRelationsMetadata.remove_metadata_from(
first, relation_type.name, second.pid.pid_value, second._pid_type
)
RecordRelationsMetadata.remove_metadata_from(
second, relation_type.name, first.pid.pid_value, first._pid_type
)
return first, second
def get(self):
"""Get all relations of this record, adding any relations metadata."""
relations = {}
for relation_type in current_app.config["PARENT_CHILD_RELATION_TYPES"]:
pcr = ParentChildRelation(relation_type)
name = relation_type.name
# self.record is a child
for parent_pid in pcr.parents_of(self.record.pid):
child_pid = self.record.pid
r = self._build_child(parent_pid, child_pid, name)
relations.setdefault(name, [])
relations[name].append(r)
for relation_type in current_app.config["SIBLINGS_RELATION_TYPES"]:
sr = SiblingsRelation(relation_type)
name = relation_type.name
for related_pid in sr.all(self.record.pid):
r = self._build_sibling(related_pid, name)
relations.setdefault(name, [])
relations[name].append(r)
for relation_type in current_app.config["SEQUENCE_RELATION_TYPES"]:
sqr = SequenceRelation(relation_type)
name = relation_type.name
for next_pid in sqr.next_relations(self.record.pid):
relations.setdefault("next", [])
r = self._build_sequence(next_pid, name)
relations["next"].append(r)
for previous_pid in sqr.previous_relations(self.record.pid):
relations.setdefault("previous", [])
r = self._build_sequence(previous_pid, name)
relations["previous"].append(r)
return relations