As you learned in the Initializing the LLM lesson of Neo4j & LLM Fundamentals, Langchain uses the Neo4jGraph
class to communicate with Neo4j.
You will need to create an instance of the Neo4jGraph
class and connect to the Neo4j Sandbox instance created for you when you enrolled in the course.
To complete this challenge, you will need to:
-
Add the Neo4j Credentials to
.streamlit/secrets.toml
-
Create a new
Neo4jGraph
instance using these credentials
Set the Neo4j Secrets
Here are the credentials for your Neo4j Sandbox instance.
- Scheme
-
bolt
- Connection URL
-
{sandbox-ip}
- Username
-
{sandbox-username}
- Password
-
{sandbox-password}
Set these as secrets in the Streamlit app by opening the .streamlit/secrets.toml
and adding the following values.
OPENAI_API_KEY = "sk-..."
OPENAI_MODEL = "gpt-4"
NEO4J_URI = "bolt://{sandbox-ip}:{sandbox-boltPort}"
NEO4J_USERNAME = "{sandbox-username}"
NEO4J_PASSWORD = "{sandbox-password}"
Connect to the database
Open the graph.py
file in the project root, import the Neo4jGraph
class, and create a new instance with your credentials.
from langchain_neo4j import Neo4jGraph
graph = Neo4jGraph(
url=st.secrets["NEO4J_URI"],
username=st.secrets["NEO4J_USERNAME"],
password=st.secrets["NEO4J_PASSWORD"],
)
Using the Neo4jGraph Instance
Once you have completed the steps, you can import
the graph
and use the Neo4jGraph instance in other modules within the project.
from graph import graph
Summary
In this lesson, you added your Neo4j Sandbox credentials to the app and used them to create a Neo4jGraph
object.
In the next lesson, you will create an Agent to communicate with the LLM.