delete relationship

backend/memgraph/deleteRelationship.go

@@ -0,0 +1,36 @@
+package memgraph
+
+import (
+	"fmt"
+	"time"
+
+	"github.com/neo4j/neo4j-go-driver/v5/neo4j"
+	"golang.org/x/net/context"
+)
+
+func (r *Relationship) DeleteRelationship(driver neo4j.DriverWithContext) error {
+	ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
+	defer cancel()
+
+	session := driver.NewSession(ctx, neo4j.SessionConfig{AccessMode: neo4j.AccessModeRead})
+	defer session.Close(ctx)
+
+	if err := r.Verify(); err != nil {
+		return err
+	}
+
+	query := ""
+	if r.Direction == "->" {
+		query = fmt.Sprintf(`MATCH (a)-[r:%s]->(b)`, r.Relationship)
+	} else if r.Direction == "<-" {
+		query = fmt.Sprintf(`MATCH (a)<-[r:%s]-(b)`, r.Relationship)
+	} else {
+		query = fmt.Sprintf(`MATCH (a)-[r:%s]-(b)`, r.Relationship)
+	}
+
+	query = fmt.Sprintf(`%s WHERE a.ID = %s AND b.ID = %s DELETE r;`, query, r.FirstPersonID, r.SecondPersonID)
+
+	_, err := session.Run(ctx, query, nil)
+
+	return err
+}