Exploring Graphs with Elixir

Setting Up a Graph Service

To use the graph services API, we’re going to define some wrapper functions for the Dlex library functions.

Schema API

First, let’s add a special function to the DGraph.Service module to upload our Dgraph schema:

apps/d_graph/lib/d_graph/service.ex

def schema_update(%GraphCommons.Graph{} = graph) do
  Dlex.alter(DGraph.Service.get_pid(), graph.data)
end

We’ll use a %GraphCommons.Graph{} struct to hold the schema data, which we’ll access with the usual read_graph/1 function. We can then retrieve the schema body and pass that to Dlex.alter/3.

Graph API

The graph service functions are simply defined as:

apps/d_graph/lib/d_graph/service.ex

def graph_create(graph) do
  graph_delete()
  graph_update(graph)