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+---
+author: Jens Neuse
+title: @resolve directive to resolve input fields or entity request inputs in the Router
+---
+
+## Problem
+
+It's common to have a Subgraph that can mutate entities which have references to other entities.
+When a mutation is performed, we've got to ensure that the referenced entity exists or if the ID is valid.
+
+The problem could be solved by making a network call from one Subgraph to another to validate the integrity of the reference.
+However, this approach would introduce multiple problems.
+
+1. We create a dependency between Subgraphs which creates tight coupling
+2. Schema usage metrics only work for requests that are resolved through the Router
+
+We're adding unnecessary complexity and overhead to the system by requiring network calls between Subgraphs.
+We could solve this issue by calling other Subgraphs through the Router,
+but this would require us the expose the validation query to the public API,
+or we'd have to run a separate instance of the Router for internal use with a contract,
+which adds complexity again.
+
+Wouldn't it be great if we could somehow validate references in a declarative way?
+In addition, such a solution could allow us to "query" input fields for operations that are not directly related to the entity.
+
+## Solution
+
+I propose to add "internal" fields which we mark as `@inaccessible`.
+These can be used by the Router to resolve information that is useful to other Subgraphs, but not directly accessible as keys.
+
+In addition, I propose a new directive `@resolve` which allows us to define a query on an input field.
+This input field can be market as `@inaccessible` to prevent exposing it to the public API.
+As such, clients are not able to define the input field in their queries.
+Instead, the Router will execute the query defined in the `@resolve` directive and pass the result to the input.
+
+# Benefits
+
+Implicit data dependencies between services are invisible.
+If you call a mutation on Subgraph A,
+and Subgraph A needs to call Subgraph B and C to fulfill this mutation,
+the reality is that this mutation depends on Subgraph A, B, and C.
+
+However, in this scenario, we're only seeing Subgraph A in the analytics, query planning, etc. because the Subgraphs B and C are being called "off-graph".
+Implicit off-graph calls are invisible.
+We're unaware they are happening, but even worse, we simply don't understand the relationship between a root field (e.g. Mutation) and our service layer.
+
+By explicitly defining our data dependencies on the graph,
+we can build tooling around information like query plans, analytics, etc.
+so we can make these dependencies nost just visible,
+but use them to our advantage.
+
+Breaking change detection can use schema usage from these "internal" calls to prevent production issues.
+Query plans can show these implicit dependencies.
+A dashboard can show which queries depend on which services, explicit and implicit.
+Another dashboard can show dependencies between services.
+
+## Example 1: Validate a Reference
+
+```graphql
+# Review Subgraph
+type Review @key(fields: "id") {
+    id: ID!
+    rating: Int!
+    comment: String!
+}
+
+extend type Product @key(fields: "id") {
+    id: ID!
+    reviews: [Review]
+}
+
+type Query {
+    reviewByID(id: ID!): Review @inaccessible
+}
+```
+
+```graphql
+# Product Admin Subgraph
+
+input RemoveReviewInput {
+    productID: ID!
+    reviewID: ID!
+    # This field is used to validate the review exists
+    # if the Router resolves it to null, the mutation will fail because the field is not nullable
+    # if it's resolved to a value, the mutation will have access to the content as part of the input
+    review: RemoveReviewReviewInput! @inaccessible @resolve(query: "query Review($id: ID!) { reviewByID(id: $id) { id }}", variables: "{ \"id\": {{ .entity.reviewID }} }")
+}
+
+input RemoveReviewReviewInput {
+    id: ID!
+}
+
+type Mutation {
+    removeReview(input: RemoveReviewInput!): Review
+}
+```
+
+## Example 2: Query input from another Subgraph
+
+Let's say we've got a userInfo Subgraph which is able to provide user information based on request headers.
+We'd like to make this information available to all other Subgraphs without exposing it to the public API.
+
+```graphql
+# UserInfo Subgraph
+type Query {
+    userInfo: UserInfo @inaccessible
+}
+
+type UserInfo @inaccessible {
+    id: ID!
+    name: String!
+    email: String!
+}
+```
+
+We've defined a UserInfo Subgraph which provides user information.
+We're market the `userInfo` field and the `UserInfo` type as `@inaccessible` to prevent clients from accessing this information directly.
+Let's see how we can use it in another Subgraph:
+
+```graphql
+# User Subgraph
+type Query {
+    currentUser(input: CurrentUserInput! @inaccessible): User
+}
+
+input CurrentUserInput {
+    info: UserInfoInput @inaccessible @resolve(query: "query { info: userInfo { id name email }}")
+}
+
+input UserInfoInput {
+    id: ID!
+    name: String!
+    email: String!
+}
+
+type User {
+    id: ID!
+    name: String!
+    email: String!
+}
+```
+
+The public schema of the Supergraph will look as follows:
+
+```graphql
+type Query {
+    currentUser: User
+}
+
+type User {
+    id: ID!
+    name: String!
+    email: String!
+}
+```
+
+As an alternative, it's also possible to use the `@resolve` directive on a field to resolve the value of the field.
+
+```graphql
+# User Subgraph
+type User @key(fields: "id") {
+    id: ID!
+    name: String! @requires(fields: "info")
+    email: String! @requires(fields: "info")
+    info: UserInfo @inaccessible @resolve(query: "query { info: userInfo { id name email }}")
+}
+
+type UserInfo @inaccessible {
+    id: ID!
+    name: String!
+    email: String!
+}
+```
+
+Both the `name` and `email` fields are marked as `@requires` to ensure that the `info` field is resolved before the `name` and `email` fields are resolved.
+The `info` field is marked as `@inaccessible` to prevent clients from accessing this information directly.
+If the Router would want to resolve the `name` or `email` field,
+it would first resolve the `info` field and attach it to the entities request variables.
+
+Subgraph request example:
+
+```json
+{
+  "query": "_entities($representations: [_Any!]!) { _entities(representations: $representations) { ... on User { id name email } } }",
+  "variables": {
+    "representations": [{ "__typename": "User", "id": "1", "info": { "id": "1", "name": "Alice", "email": "alice@dot.com" } }]
+  }
+}
+```