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michaelstaib merged 5 commits into from
Mar 10, 2026
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[Fusion] Add data-requirements chapter #9348

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[Fusion] Add data-requirements chapter
michaelstaib Mar 10, 2026
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Merge branch 'main' into mst/fusion-docs-100326-1
michaelstaib Mar 10, 2026
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4 changes: 4 additions & 0 deletions website/src/docs/docs.json
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Expand Up @@ -188,6 +188,10 @@
"path": "entities-and-lookups",
"title": "Entities and Lookups"
},
{
"path": "data-requirements-and-mapping",
"title": "Data Requirements and Mapping"
},
{
"path": "composition",
"title": "Composition"
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44 changes: 22 additions & 22 deletions website/src/docs/fusion/v16/attribute-and-directive-reference.md
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Expand Up @@ -6,28 +6,28 @@ Quick reference for all Fusion-related attributes and their GraphQL directive eq

# Attribute and Directive Reference Table

| Attribute | Directive | Description | Guide Page |
| --------------------------- | --------------- | ---------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------ |
| `[ObjectType<T>]` | — | Maps static class as extension to entity type T | [Entities and Lookups](/docs/fusion/v16/entities-and-lookups) |
| `[QueryType]` | — | Marks class as contributing Query root fields | [Getting Started](/docs/fusion/v16/getting-started) |
| `[MutationType]` | — | Marks class as contributing Mutation root fields | [Getting Started](/docs/fusion/v16/getting-started) |
| `[SubscriptionType]` | — | Marks class as contributing Subscription root fields | [Getting Started](/docs/fusion/v16/getting-started) |
| `[Lookup]` | `@lookup` | Declares field as entity lookup resolver | [Entities and Lookups](/docs/fusion/v16/entities-and-lookups) |
| `[NodeResolver]` | — | Marks as Relay node resolver | [Entities and Lookups](/docs/fusion/v16/entities-and-lookups) |
| `[Internal]` | `@internal` | Hides lookup from composed schema | [Entities and Lookups](/docs/fusion/v16/entities-and-lookups) |
| `[Shareable]` | `@shareable` | Allows multiple subgraphs to resolve field | [Entities and Lookups](/docs/fusion/v16/entities-and-lookups) |
| `[Parent(requires: "...")]` | — | Declares field requirements from parent | [Entities and Lookups](/docs/fusion/v16/entities-and-lookups) |
| `[Require("...")]` | `@require` | Declares complex field requirements | [Getting Started](/docs/fusion/v16/getting-started), [Adding a Subgraph](/docs/fusion/v16/adding-a-subgraph) |
| `[EntityKey("...")]` | `@key` | Declares entity key for resolution | [Entities and Lookups](/docs/fusion/v16/entities-and-lookups) |
| `[BindMember(nameof(...))]` | — | Replaces raw FK with resolved entity | [Adding a Subgraph](/docs/fusion/v16/adding-a-subgraph) |
| `[Tag("...")]` | `@tag` | Applies tag for composition filtering | [Composition](/docs/fusion/v16/composition) |
| `[DataLoader]` | — | Source-generates DataLoader interface | [Getting Started](/docs/fusion/v16/getting-started), [Entities and Lookups](/docs/fusion/v16/entities-and-lookups) |
| `[UsePaging]` | — | Enables cursor-based pagination | [Getting Started](/docs/fusion/v16/getting-started) |
| `[ID<T>]` | — | Declares field as Relay-style ID | [Entities and Lookups](/docs/fusion/v16/entities-and-lookups) |
| `[Inaccessible]` | `@inaccessible` | Hides from composite schema | [Composition](/docs/fusion/v16/composition) |
| `[Override(from: "...")]` | `@override` | Migrates field ownership | [Deployment and CI/CD](/docs/fusion/v16/deployment-and-ci-cd) |
| `[Provides("...")]` | `@provides` | Declares locally-resolvable subfields | [Entities and Lookups](/docs/fusion/v16/entities-and-lookups) |
| `[External]` | `@external` | Field defined by another subgraph | [Entities and Lookups](/docs/fusion/v16/entities-and-lookups) |
| Attribute | Directive | Description | Guide Page |
| --------------------------- | --------------- | ---------------------------------------------------- | ---------------------------------------------------------------------------------------------------------------------------------------- |
| `[ObjectType<T>]` | — | Maps static class as extension to entity type T | [Entities and Lookups](/docs/fusion/v16/entities-and-lookups) |
| `[QueryType]` | — | Marks class as contributing Query root fields | [Getting Started](/docs/fusion/v16/getting-started) |
| `[MutationType]` | — | Marks class as contributing Mutation root fields | [Getting Started](/docs/fusion/v16/getting-started) |
| `[SubscriptionType]` | — | Marks class as contributing Subscription root fields | [Getting Started](/docs/fusion/v16/getting-started) |
| `[Lookup]` | `@lookup` | Declares field as entity lookup resolver | [Entities and Lookups](/docs/fusion/v16/entities-and-lookups) |
| `[NodeResolver]` | — | Marks as Relay node resolver | [Entities and Lookups](/docs/fusion/v16/entities-and-lookups) |
| `[Internal]` | `@internal` | Hides lookup from composed schema | [Entities and Lookups](/docs/fusion/v16/entities-and-lookups) |
| `[Shareable]` | `@shareable` | Allows multiple subgraphs to resolve field | [Entities and Lookups](/docs/fusion/v16/entities-and-lookups) |
| `[Parent(requires: "...")]` | — | Declares field requirements from parent | [Entities and Lookups](/docs/fusion/v16/entities-and-lookups) |
| `[Require("...")]` | `@require` | Declares complex field requirements | [Data Requirements and Mapping](/docs/fusion/v16/data-requirements-and-mapping), [Adding a Subgraph](/docs/fusion/v16/adding-a-subgraph) |
| `[EntityKey("...")]` | `@key` | Declares entity key for resolution | [Entities and Lookups](/docs/fusion/v16/entities-and-lookups) |
| `[BindMember(nameof(...))]` | — | Replaces raw FK with resolved entity | [Adding a Subgraph](/docs/fusion/v16/adding-a-subgraph) |
| `[Tag("...")]` | `@tag` | Applies tag for composition filtering | [Composition](/docs/fusion/v16/composition) |
| `[DataLoader]` | — | Source-generates DataLoader interface | [Getting Started](/docs/fusion/v16/getting-started), [Entities and Lookups](/docs/fusion/v16/entities-and-lookups) |
| `[UsePaging]` | — | Enables cursor-based pagination | [Getting Started](/docs/fusion/v16/getting-started) |
| `[ID<T>]` | — | Declares field as Relay-style ID | [Entities and Lookups](/docs/fusion/v16/entities-and-lookups) |
| `[Inaccessible]` | `@inaccessible` | Hides from composite schema | [Composition](/docs/fusion/v16/composition) |
| `[Override(from: "...")]` | `@override` | Migrates field ownership | [Deployment and CI/CD](/docs/fusion/v16/deployment-and-ci-cd) |
| `[Provides("...")]` | `@provides` | Declares locally-resolvable subfields | [Data Requirements and Mapping](/docs/fusion/v16/data-requirements-and-mapping) |
| `[External]` | `@external` | Field defined by another subgraph | [Data Requirements and Mapping](/docs/fusion/v16/data-requirements-and-mapping) |

# See Also

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2 changes: 1 addition & 1 deletion website/src/docs/fusion/v16/composition.md
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Expand Up @@ -19,7 +19,7 @@ Composition is a three-phase process that transforms multiple source schemas int
Each source schema is validated in isolation. The composition engine checks:

- The schema is valid GraphQL according to the base specification.
- All Fusion directives and attributes are used correctly (e.g., `@external` fields are referenced by `@key` or `@provides`).
- All Fusion directives and attributes are used correctly (e.g., `@external` fields are referenced by `@provides`).
- Key fields reference valid scalar or object types.
- Lookup fields have the correct argument-to-entity-field mappings.

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