Graphs
This chapter describes the general-graph module. It allows you to define a graph that is spread across several edge and document collections. This allows you to structure your models in line with your domain and group them logically in collections giving you the power to query them in the same graph queries. There is no need to include the referenced collections within the query, this module will handle it for you.
Three Steps to create a graph
- Create a graph
arangosh> var graph_module = require("@arangodb/general-graph");
arangosh> var graph = graph_module._create("myGraph");
arangosh> graph;
{[Graph]
}
- Add some vertex collections
arangosh> graph._addVertexCollection("shop");
arangosh> graph._addVertexCollection("customer");
arangosh> graph._addVertexCollection("pet");
arangosh> graph;
{[Graph]
"shop" : [ArangoCollection 18350, "shop" (type document, status loaded)],
"customer" : [ArangoCollection 18356, "customer" (type document, status loaded)],
"pet" : [ArangoCollection 18362, "pet" (type document, status loaded)]
}
arangosh> graph._addVertexCollection("shop");
arangosh> graph._addVertexCollection("customer");
arangosh> graph._addVertexCollection("pet");
arangosh> graph;
- Define relations on the Graph
arangosh> var rel = graph_module._relation("isCustomer", ["shop"], ["customer"]);
arangosh> graph._extendEdgeDefinitions(rel);
arangosh> graph;
{[Graph]
"isCustomer" : [ArangoCollection 18424, "isCustomer" (type edge, status loaded)],
"shop" : [ArangoCollection 18416, "shop" (type document, status loaded)],
"customer" : [ArangoCollection 18420, "customer" (type document, status loaded)],
"pet" : [ArangoCollection 18409, "pet" (type document, status loaded)]
}
arangosh> var rel = graph_module._relation("isCustomer", ["shop"], ["customer"]);
arangosh> graph._extendEdgeDefinitions(rel);
arangosh> graph;