General 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.

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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;

{[GeneralGraph] 
}

Add some vertex collections

arangosh> graph._addVertexCollection("shop");
arangosh> graph._addVertexCollection("customer");
arangosh> graph._addVertexCollection("pet");
arangosh> graph = graph_module._graph("myGraph");

{[GeneralGraph] 
  "customer" : [ArangoCollection 74995, "customer" (type document, status loaded)], 
  "pet" : [ArangoCollection 75004, "pet" (type document, status loaded)], 
  "shop" : [ArangoCollection 74986, "shop" (type document, status loaded)] 
}

Define relations on the Graph

arangosh> var rel = graph_module._relation("isCustomer", ["shop"], ["customer"]);
arangosh> graph._extendEdgeDefinitions(rel);
arangosh> graph = graph_module._graph("myGraph");

{[GeneralGraph] 
  "isCustomer" : [ArangoCollection 75069, "isCustomer" (type edge, status loaded)], 
  "shop" : [ArangoCollection 75063, "shop" (type document, status loaded)], 
  "customer" : [ArangoCollection 75066, "customer" (type document, status loaded)], 
  "pet" : [ArangoCollection 75052, "pet" (type document, status loaded)] 
}