In AWS Amplify, you can use user information in the GraphQL schema by leveraging the built-in authentication capabilities provided by AWS Cognito. When a user is authenticated, Amplify automatically attaches the user information to the GraphQL API requests, allowing you to access the user's attributes within your GraphQL schema.

Here's how you can use user info in the AWS Amplify GraphQL schema:

  1. Set Up Amplify Auth: First, make sure you have set up authentication in your Amplify project. If you haven't already done so, run the following command in your project directory to configure authentication using AWS Cognito:

    bash
    amplify add auth

    Follow the prompts to set up authentication with the desired configuration.

  2. Update the GraphQL Schema: Once authentication is set up, you can add a new field in your GraphQL schema to access the user information. Open the schema.graphql file located in the amplify/backend/api/your-api-name directory and add a new field to any relevant types.

    For example, if you have a Post type and want to associate each post with the user who created it, you can add a field like owner to represent the user:

    graphql
    type Post @model { id: ID! title: String! content: String! owner: String }

    The owner field will store the username or sub (unique user identifier) of the authenticated user who created the post.

  3. Deploy the Amplify API: After making changes to the GraphQL schema, you need to deploy the Amplify API to apply the changes. Run the following command in your project directory:

    bash
    amplify push

    Follow the prompts to deploy the updated API.

  4. Access User Info in Resolvers: With the changes in place, you can now access the authenticated user's information in your resolvers on the server-side. Amplify will automatically include the user context with each GraphQL request, allowing you to retrieve the user information.

    For example, in a resolver function, you can access the user's sub (unique identifier) like this:

    javascript
    const resolverFunction = async (source, args, context, info) => { const { sub } = context.identity.claims; // Now you can use the 'sub' to identify the authenticated user and perform operations based on it. };

    The context parameter contains the user context, and context.identity.claims provides access to the user's attributes, including the sub.

By following these steps, you can use user information in the AWS Amplify GraphQL schema and create data associations based on the authenticated user. Remember to secure your API by ensuring that only authenticated users can access the data that requires user-specific information.

Have questions or queries?
Get in Touch