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Jan 31, 2025
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feat(amplify-data): enhance discussion of split schema files #8228

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d902003
feat: enhance discussion of split schema files
palpatim Jan 30, 2025
e71c1c2
fix: clarify callout wording
palpatim Jan 31, 2025
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18 changes: 8 additions & 10 deletions src/pages/gen1/[platform]/build-a-backend/graphqlapi/data-modeling/index.mdx
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Expand Up @@ -1119,33 +1119,31 @@ Amplify GraphQL schemas support the `extend` keyword, which allows you to extend

2. In one of the files (e.g., `schema1.graphql`), declare your type normally:

```graphql
```graphql title="schema1.graphql"
type Query {
# initial custom queries
myQuery: String @function(name: "myQueryFunction-${env}")
}
```

3. In other schema files (e.g., `schema2.graphql`), use the `extend` keyword to add to the type:

```graphql
```graphql title="schema2.graphql"
extend type Query {
# additional custom queries
myQuery2: String @function(name: "myQuery2Function-${env}")
}
```
<Callout info>
The order in which the Query types are extended does not affect the compilation of separate schema files.
</Callout>

<Callout info>
Declaring custom Query, Mutation, and/or Subscription with the same field names in another schema file will result in schema validation errors similar to the following:
The order in which the Query types are extended does not affect the compilation of separate schema files. However, declaring custom Query, Mutation, and/or Subscription extensions with the same field names in another schema file will result in schema validation errors similar to the following:

`🛑 Object type extension 'Query' cannot redeclare field getBlogById`
</Callout>

<Callout info>
Amplify directives are currently not supported on the extended type definitions. You can use the extend keyword to organize custom queries, mutations, and subscriptions that use [custom resolvers](https://docs.amplify.aws/gen1/react/build-a-backend/graphqlapi/best-practice/batch-put-custom-resolver/).
4. Add functionality to the fields of the extended type using Amplify directives. Amplify supports the `@auth`, `@function`, and `@http` directives on fields of `Query`, `Mutation`, and `Subscription` type extensions. Alternately, you can use the `extend` keyword to organize custom queries, mutations, and subscriptions that use [custom resolvers](https://docs.amplify.aws/gen1/react/build-a-backend/graphqlapi/best-practice/batch-put-custom-resolver/) rather than Amplify directives.

For the latest updates and potential future enhancements, please track the ongoing discussion in [GitHub Issue #3036](https://github.com/aws-amplify/amplify-category-api/issues/3036).
<Callout info>
Amplify directives are not supported on extended type definitions themselves (e.g., `extend type Todo @auth...`), or on fields of extended types other than `Query`, `Mutation`, and `Subscription`.
</Callout>

## How it works
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