Subscription lifecycle in GraphQL - Mini Project: Build & Apply

Subscription Lifecycle Management with GraphQL

📖 Scenario: You are building a simple subscription management system for a magazine service. Customers can subscribe to different magazines, and you want to track their subscription status and details using GraphQL.

🎯 Goal: Create a GraphQL schema and queries to manage and retrieve subscription lifecycle data, including subscriber information, subscription plans, and status.

📋 What You'll Learn

Define a GraphQL type Subscriber with fields id, name, and email.

Define a GraphQL type Subscription with fields id, subscriberId, plan, and status.

Create a query subscriptions to retrieve all subscriptions.

Create a query activeSubscriptions to retrieve subscriptions with status ACTIVE.

💡 Why This Matters

🌍 Real World

Subscription lifecycle management is common in services like magazines, streaming platforms, and SaaS products to track user subscriptions and their status.

💼 Career

Understanding GraphQL schema design and queries is essential for backend developers working with modern APIs and subscription-based services.

1

Define Subscriber and Subscription Types

Define a GraphQL type called Subscriber with fields id of type ID!, name of type String!, and email of type String!. Also define a GraphQL type called Subscription with fields id of type ID!, subscriberId of type ID!, plan of type String!, and status of type String!.

GraphQL

# Define Subscriber and Subscription types
# Your code here

Hint

Use type keyword to define GraphQL types. Use ! to mark fields as required.

2

Add Query Type with subscriptions Field

Add a GraphQL Query type with a field called subscriptions that returns a list of Subscription objects. Use [Subscription!]! as the return type to indicate a non-null list of non-null subscriptions.

GraphQL

type Subscriber {
  id: ID!
  name: String!
  email: String!
}

type Subscription {
  id: ID!
  subscriberId: ID!
  plan: String!
  status: String!
}

# Add Query type with subscriptions field
# Your code here

Hint

Define a Query type with a field returning a list of subscriptions.

3

Add activeSubscriptions Query with Status Filter

Add a field called activeSubscriptions to the Query type that returns a list of Subscription objects with status ACTIVE. Use the same return type [Subscription!]!.

GraphQL

type Subscriber {
  id: ID!
  name: String!
  email: String!
}

type Subscription {
  id: ID!
  subscriberId: ID!
  plan: String!
  status: String!
}

type Query {
  subscriptions: [Subscription!]!
  # Add activeSubscriptions field
  # Your code here
}

Hint

Add the activeSubscriptions field to the Query type with the correct return type.

4

Complete Schema with Subscription Status Enum

Add an enum type called SubscriptionStatus with values ACTIVE, CANCELLED, and PAUSED. Update the status field in Subscription type to use SubscriptionStatus! instead of String!.

GraphQL

type Subscriber {
  id: ID!
  name: String!
  email: String!
}

type Subscription {
  id: ID!
  subscriberId: ID!
  plan: String!
  status: String!
}

type Query {
  subscriptions: [Subscription!]!
  activeSubscriptions: [Subscription!]!
}

# Add SubscriptionStatus enum and update status field
# Your code here

Hint

Use enum to define fixed status values and update the status field type accordingly.