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Labels

Labels are tags that you can associate a node to. A node can have more than one label and a label can have more than one node.

Add and remove labels to/from a node

For example, we can create a couple of nodes:

>>> alice = gdb.nodes.create(name="Alice", age=30)
>>> bob = gdb.nodes.create(name="Bob", age=30)

And then put the label Person to both of them:

>>> alice.labels.add("Person")
>>> bob.labels.add("Person")

You can also add more than one label at the time, or replace all the labels of a node:

>>> alice.labels.add(["Person", "Woman"])
>>> bob.labels = ["Person", "Man", "Woman"]

And remove labels in the same way:

>>> bob.labels.remove("Woman")

Although using labels from a GraphDatabase is usually easier:

>>> people = gdb.labels.create("Person")
>>> people.add(alice, bob)

The call for gdb.labels.create does not actually create the label until the first node is added.

We can also check if a node already has a specific label:

>>> "Animal" in bob.labels
False

List, get and filter

One common use case for labels is to list all the nodes that are under the same label. The most basic way to do it is by using the .all() method once we assign a label to a variable:

>>> person = gdb.labels.get("Person")
>>> person.all()

Or get those nodes that has a certain pair property name and value:

>>> person.get(age=25)

Can list and filter nodes according to the labels they are associated to by using the Q objects provided by neo4j-rest-client:

>>> from neo4jrestclient.query import Q
>>> people.filter(gdb.Q("age", "gte", 30))