feat: implements DB projection to memory

cognee/modules/graph/cognee_graph/CogneeGraph.py

@@ -13,13 +13,22 @@ class CogneeGraph(CogneeAbstractGraph):
     This class provides the functionality to manage nodes and edges,
     and project a graph from a database using adapters.
     """
+
+    nodes: Dict[str, Node]
+    edges: List[Edge]
+    directed: bool
+
+    def __init__(self, directed: bool = True):
+        self.nodes = {}
+        self.edges = []
+        self.directed = directed
+
     def add_node(self, node: Node) -> None:
         if node.id not in self.nodes:
             self.nodes[node.id] = node
         else:
             raise ValueError(f"Node with id {node.id} already exists.")
 
-    # :TODO ADD dimension
     def add_edge(self, edge: Edge) -> None:
         if edge not in self.edges:
             self.edges.append(edge)
@@ -38,34 +47,42 @@ class CogneeGraph(CogneeAbstractGraph):
         else:
             raise ValueError(f"Node with id {node_id} does not exist.")
 
-    # :TODO This should take also the list of entity types and connection types to keep. (Maybe we dont need all and can keep just an abstraction of the db network)
-    async def project_graph_from_db(self, adapter: Union[Neo4jAdapter, NetworkXAdapter]) -> None:
+    async def project_graph_from_db(self,
+                                    adapter: Union[NetworkXAdapter, Neo4jAdapter],
+                                    node_properties_to_project: List[str],
+                                    edge_properties_to_project: List[str],
+                                    directed = True,
+                                    node_dimension = 1,
+                                    edge_dimension = 1) -> None:
+        try:
+            nodes_data, edges_data = await adapter.get_graph_data()
 
-        # :TODO: Handle networkx and Neo4j separately
-        nodes_data, edges_data = await adapter.get_graph_data()
+            if not nodes_data:
+                raise ValueError("No node data retrieved from the database.")
+            if not edges_data:
+                raise ValueError("No edge data retrieved from the database.")
 
-        raise NotImplementedError("To be implemented...tomorrow")
+            for node_id, properties in nodes_data:
+                node_attributes = {key: properties.get(key) for key in node_properties_to_project}
+                self.add_node(Node(str(node_id), node_attributes, dimension=node_dimension))
 
+            for source_id, target_id, relationship_type, properties in edges_data:
+                source_node = self.get_node(str(source_id))
+                target_node = self.get_node(str(target_id))
+                if source_node and target_node:
+                    edge_attributes = {key: properties.get(key) for key in edge_properties_to_project}
+                    edge_attributes['relationship_type'] = relationship_type
 
-"""
-The following code only used for test purposes and will be deleted later
-"""
-import asyncio
+                    edge = Edge(source_node, target_node, attributes=edge_attributes, directed=directed, dimension=edge_dimension)
+                    self.add_edge(edge)
 
-async def main():
-    # Choose the adapter (Neo4j or NetworkX)
-    adapter = await get_graph_engine()
+                    source_node.add_skeleton_edge(edge)
+                    target_node.add_skeleton_edge(edge)
 
-    # Create an instance of CogneeGraph
-    graph = CogneeGraph()
+                else:
+                    raise ValueError(f"Edge references nonexistent nodes: {source_id} -> {target_id}")
 
-    # Project the graph from the database
-    await graph.project_graph_from_db(adapter)
-
-    # Access nodes and edges
-    print(f"Graph has {len(graph.nodes)} nodes and {len(graph.edges)} edges.")
-    print("Sample node:", graph.get_node("node1"))
-    print("Edges for node1:", graph.get_edges("node1"))
-
-# Run the main function
-asyncio.run(main())
+        except (ValueError, TypeError) as e:
+            print(f"Error projecting graph: {e}")
+        except Exception as ex:
+            print(f"Unexpected error: {ex}")