Developing GraphQL APIs in Django using Graphene By Nisarg Shah - - PowerPoint PPT Presentation

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Dec 07, 2022 515 likes •930 views

Developing GraphQL APIs in Django using Graphene By Nisarg Shah Nisarg Shah Crazy Developer HELLO! Undergrad CS Student Software Developer at Tweetozy Co-creator of CoursesAround CONNECT WITH ME! iamnisarg.in nisarg1499 nisargshah14

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By Nisarg Shah

Developing GraphQL APIs in Django using Graphene

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CONNECT WITH ME! iamnisarg.in nisarg1499 nisargshah14 HELLO!

Undergrad CS Student Software Developer at Tweetozy Co-creator of CoursesAround

Nisarg Shah

Crazy Developer

nisshah1499@gmail.com

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Today's Talk

MAIN POINTS

General View on API REST APIs and GraphQL APIs Understand GraphQL Implementation using Graphene

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SOME POPULAR API PROTOCOLS

SOAP
REST
and many more.....

Building Web Applications

Most web applications use APIs in their backend and

build their interface upon that.

Complete business logic in one place

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Endpoints

GET https /{id}/getProfile

PUT https /{id}/talkTitle POST https /{id}/newProfile DELETE https /{profileId}

RESTful APIs

A piece of code is executed when these APIs are called.
Server returns the response to client

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Problems faced in RESTful APIs

Multiple Endpoints
Over Fetching
Under Fetching

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What can be the alternative?

GraphQL

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GraphQL

Open Source
GraphQL is a Query

Language

Uses Schema based

system

Easy and efficient to use

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Why GraphQL?

Client requests the

needed data. Client decides the query and according to that data is fetched.

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And you know what...

Only one API Endpoint
No over fetching or

under fetching

Auto-generation of

API documentation

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Let's learn about GraphQL

Schema : structure
Mutation : updating data on server
Queries : fetching data
Subscriptions : real time data exchange

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Schema

GraphQL Object Type

⚬ Product

Fields

⚬ productId ⚬ productName ⚬ and few listed in pic

Scalar Types

⚬ Int ⚬ String ⚬ and many more...

Product Schema

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Used for changing data on

server

Return the response

according to your needs

Variables passed can be

scalars or ObjectTypes

Mutation

Response from server

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Using query variables for inserting data

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Get data from server
Ask for specific fields on
bjects
Design query according to

needs

Query

Response from server

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Realtime connection to

server

Client subscribes to an event
Server pushes data to client

when event occurs

Same syntax as queries and

mutations

Subscriptions

Response from server

subscription{ addProduct{ productName, productPrice, productDesc } } { "addProduct" : { "productName" : " Toy", "productPrice" : 500, "productDesc" : "New toy" } }

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Libraries for building GraphQL APIs in Python

STRAWBERRY

456 Stars

Code-First Approach

ARIADNE

896 Stars

Schema-First Approach

GRAPHENE

5.6k+ Stars

Code-First Approach

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Let's Build GraphQL APIs

We will use

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Environment setup

⚬ ⚬ ⚬ ⚬

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Add the following in your settings.py file

GRAPHENE = { 'SCHEMA' : 'project.schema.schema' }

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Few Concepts of Graphene

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ObjectType

A block which is used to

define a relation between fields and schema

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Schema

Relationship between

fields in API

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Resolvers
A method that helps

to answer queries

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Resolvers

query($author: String!, $repoName: String!){

repo(login: $author){ repository(name: $repoName){ forkCount, updatedAt } } }

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Scalars

a.k.a : Data types

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AUTHENTICATION

Secure your backend API's using JWT Tokens

PAGINATION

Send a particular bunch of data instead

f complete data

MUTATIONS

Update the data on server

QUERIES

Fetch the data from server

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File Structure

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Used concepts : ObjectType, DjangoObjectType, resolvers, Schema

FETCHING DATA

Writing Queries

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Used concepts : ObjectType, DjangoObjectType, arguments, mutate

UPDATING DATA ON SERVER

Writing Mutations

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path('graphql/', csrf_exempt(GraphQLView.as_view(graphiql=True)))

GraphiQL View

Add this in your urls.py file

Write your graphql query/mutation here.... Server response

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Used concepts : ObjectType, DjangoObjectType, Python slicing

SENDING A BUNCH OF DATA

Pagination

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SECURING USING JWT TOKENS

Authentication

.project/schema.py settings.py

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SECURING USING JWT TOKENS

Created a mutation for creating a user
Create a user
Use this mutation while login
Store this token and use for further

queries.

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SECURING USING JWT TOKENS

user = info.context.user if user.is_anonymous: raise Exception("Not logged in!!")

Add this is your queries and mutations Add JWT Token in Headers prefixed by "JWT"

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SECURING USING JWT TOKENS

Mutation without JWT Token

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GraphQL Website : https://graphql.org/
GraphQL Blogs : Medium
HowToGraphQL : https://www.howtographql.com/
Graphene Documentation

Helpful Resources

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Open Source Project

Github Repository : https://github.com/nisarg1499/django-ecom merce-graphql Building boiler plate of ecommerce by implementing GraphQL APIs in django Currently 3 active contributors

django-ecommerce

graphql

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THANK YOU

FINAL WORDS

NISARG SHAH

CONNECT WITH ME! iamnisarg.in nisarg1499 nisargshah14 nisshah1499@gmail.com