Querying Data from MongoDB using GraphQL in Django: Get-Go (1)

The ease of MongoDB combined with the power of GraphQL: I cannot think of a better combination than this! I will be curating a series of articles for working on GraphQL + MongoDB + Django. This is the first part of that series.

In this article, you will learn how to-

• import data into MongoDB using a CSV file
• install GraphQL and other related Django libraries
• pull data from MongoDB to Django

From .csv to MongoDB Collection

Run this code directly in your terminal (not mongod console) to import a CSV file from your local. We are using mongoimport which is a tool/command that enables us to import any JSON, CSV to TSV file.

mongoimport -d vendors -c vendors --type csv --file vendorlist.csv --headerline

where

-d: database name

-c: collection name

-headerline: used to keep the headers

Installing GraphQL in Django

Yet another saga of versioning mismatch. I have already played with them so you don't have to 🙂

Below are the errors that were causing a lot of confusion regarding the versions-

Error when the version of graphene-django was 3.0b7 which was latest but it couldn’t import the get_default_backend package

Commands to install each library/package/driver

• graphene

pip install graphene==2.1.8

• graphql-core

python -m pip install graphql-core==2.3.2

• pymongo

python3 -m pip install pymongo==3.12.1

• graphene-django

pip install "graphene-django>=2.0"

💡 Don’t forget to add ‘graphene-django’ and ‘graphene’ to your settings.py file

Getting a MongoDB collection’s data to Django project

Import the Document class from mongoengine library and subsequently import the fields that are required.

💡 Your can check the datatype of the field in MongoDB in MongoDB Atlas console and then import the field in your Django project. Example- The ID field in a document id always an ObjectIDField.

I have a MongoDB document vendors and the class that is accessing the document is VendorData.

This was the first part of the series of MongoDB+Django+GraphQL tutorials. I will explain more about writing queries in Django and GraphQL in the later parts.