Node#

relationalai.std.graphs.Graph
Graph.Node

Returns a Type object representing the set of nodes in a graph.

Example#

Graph.Node is a Type object. Use its .add() and .extend() methods to add nodes to the graph:

import relationalai as rai
from relationalai.std.graphs import Graph

# Create a model with a `Person` type.
model = rai.Model("socialNetwork")
Person = model.Type("Person")

# Add people to the model connected by a multi-valued 'follows' property.
with model.rule():
    alice = Person.add(name="Alice")
    bob = Person.add(name="Bob")
    alice.follows.add(bob)

# Create a directed graph.
graph = Graph(model)

# Add all 'Person' objects to the graph's nodes using 'Node.extend()'.
# The 'label' parameter is optional and sets the node's label in the graph visualization.
graph.Node.extend(Person, label=Person.name)

# Alternatively, you can add specific nodes in a rule using 'Node.add()'.
# For example, this rule adds all of Bob's followers to the graph.
with model.rule():
    person = Person()
    person.follows == Person(name="Bob")
    graph.Node.add(person, label=person.name)

# You can query the nodes the same way you query any other `Type` object.
with model.query() as select:
    node = graph.Node()
    response = select(node.label)

print(response.results)
# Output:
#    label
# 0  Alice
# 1    Bob

See Also#