GraphQL @connection

review:What is Serverless Architecture? What are its Pros and Cons?

• Summary
  • Serverless architecture is exciting, but it comes with a bunch of limitations.
  • As the validity and success of architectures depend on the business requirements and by no means solely on technology.
  • Serverless can shine when used in proper place.

    review: AWS Amplify Kool-Aid

• What is the advantage of AWS amplify? AWS Amplify makes it simple to develop, maintain and deploy applications by reducing the time and cost. The tool offers scalable and full-stack development options without having to worry about frontend or backend configurations. AWS Amplify Console is used to build, deploy, and host web apps.

  AWS Amplify features

AWS Amplify feature	Do
Authentication	Create seamless on-boarding flows with a fully-managed user directory and pre-built sign-up, sign-in, forgot password, and multi-factor auth workflows.
DataStore	Use a multi-platform (iOS/Android/React Native/Web) on-device persistent storage engine that automatically synchronizes data between mobile/web apps and the cloud, powered by GraphQL.
Analytics	Understand the behavior of your web, iOS or Android users. Use auto tracking to track user sessions and web page metrics or create custom user attributes and in-app metrics.
API	Make secure HTTP requests to GraphQL and REST endpoints to access, manipulate, and combine data from one or more data sources
Functions	Add a Lambda function to your project which you can use alongside a REST API or as a datasource in your GraphQL API using the @function directive in the Amplify CLI.
Interactions	Build interactive and engaging conversational bots with the same deep learning technologies that power Amazon Alexa with just a single line of code.
Predictions	Enhance your app by adding AI/ML capabilities. You can easily achieve use cases like text translation, speech generation from text, entities recognition in image, interpretation of text, and transcribing text.
PubSub	Pass messages between your app instances and your app’s backend creating real-time interactive experiences. Amplify provides connectivity with cloud-based message-oriented middleware. Powered by AWS IoT services and Generic MQTT Over WebSocket Providers.
Push notifications	Improve customer engagement by using marketing and analytics capabilities. Leverage customer insights to segment and target your customers more effectively.
Storage	Store and manage user generated content such as photos, videos securely on device or in the cloud.

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GraphQL @connection

• The @connection directive enables you to specify relationships between @model types.
• supports one-to-one, one-to-many, and many-to-one relationships.
• Definition
  • directive @connection(keyName: String, fields: [String!]) on FIELD_DEFINITION
• Usage
  • Has one
  • Relationships between types are specified by annotating fields on an @model object type with the @connection directive.
  • Example of define a one-to-one connection: ``` type Project @model { id: ID! name: String team: Team @connection }

type Team @model { id: ID! name: String! }

- Has many Example:

type Post @model { id: ID! title: String! comments: [Comment] @connection(keyName: “byPost”, fields: [“id”]) }

type Comment @model @key(name: “byPost”, fields: [“postID”, “content”]) { id: ID! postID: ID! content: String! } ```

• Many-to-many connections Example : check this
  • You can implement many to many using two 1-M @connections, an @key, and a joining @model. For example: