Graph Gateway

PythonProfessionalabout 10 hours14 lessons

Mobile and web clients want exactly the fields they ask for, in one round trip. Build a gateway for GraphQL on the shop's SQLite database with the real library (graphql-core, the engine under Strawberry, Ariadne and Graphene): a schema in SDL, resolvers and context, mutations with structured errors, a DataLoader that kills the N+1 problem, cursor pagination, field-level authorization, query depth and cost limits, introspection and tests. A GraphiQL-style explorer, a live query plan and a client app all run on your code.

Start the first lesson

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Learning path

Each lesson adds one working part to your build.

Chapter 1

Describe the graph

What GraphQL is, a typed schema, queries with variables, and abstract types.

0/4 done

Chapter 2

Resolvers & performance

The resolver chain, a request context, a query plan, and the N+1 fix.

0/3 done

Chapter 3

Writes, errors & lists

Mutations with input validation, errors you can design, and cursor pagination.

0/3 done

Chapter 4

Production

Authorization, query limits, introspection, tests and the REST comparison.

0/4 done

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