def create_index(self, graph):
"""
Create indices for start node and end node definition of this relationshipset. If more than one start or end
node property is defined, all single property indices as well as the composite index are created.
In Neo4j 3.x recreation of an index did not raise an error. In Neo4j 4 you cannot create an existing index.
Index creation syntax changed from Neo4j 3.5 to 4. So far the old syntax is still supported. All py2neo
functions (v4.4) work on both versions.
"""
# from start nodes
for label in self.start_node_labels:
# create individual indexes
for prop in self.start_node_properties:
create_single_index(graph, label, prop)
# composite indexes
if len(self.start_node_properties) > 1:
create_composite_index(graph, label, self.start_node_properties)
for label in self.end_node_labels:
for prop in self.end_node_properties:
create_single_index(graph, label, prop)
# composite indexes
if len(self.end_node_properties) > 1:
create_composite_index(graph, label, self.end_node_properties)
def create_index(self, graph):
"""
Create indices for all label/merge ky combinations as well as a composite index if multiple merge keys exist.
In Neo4j 3.x recreation of an index did not raise an error. In Neo4j 4 you cannot create an existing index.
Index creation syntax changed from Neo4j 3.5 to 4. So far the old syntax is still supported. All py2neo
functions (v4.4) work on both versions.
"""
if self.merge_keys:
for label in self.labels:
# create individual indexes
for prop in self.merge_keys:
create_single_index(graph, label, prop)
# composite indexes
if len(self.merge_keys) > 1:
create_composite_index(graph, label, self.merge_keys)
def test_create_composite_index(graph, clear_graph):
test_label = 'Foo'
test_properties = ['bar', 'keks']
create_composite_index(graph, test_label, test_properties)
result = list(graph.run("CALL db.indexes()"))
row = result[0]
# the result of the db.indexes() procedure is different for Neo4j 3.5 and 4
# this should also be synced with differences in py2neo versions
if 'tokenNames' in row:
assert row['tokenNames'] == [test_label]
# cast to set in case lists have different order
assert set(row['properties']) == set(test_properties)
elif 'labelsOrTypes' in row:
assert row['labelsOrTypes'] == [test_label]
# cast to set in case lists have different order
assert set(row['properties']) == set(test_properties)