chore(orchestrator): remote joiner using entitymap (#9205)

packages/core/utils/src/common/graphql-relations-entity-map.ts

@@ -0,0 +1,41 @@
+import { isListType, isNonNullType, isObjectType } from "graphql"
+
+/**
+ * Extracts only the relation fields from the GraphQL type map.
+ * @param {Map<string, any>} typeMap - The GraphQL schema TypeMap.
+ * @returns {Map<string, Map<string, string>>} A map where each key is an entity name, and the values are a map of relation fields and their corresponding entity type.
+ */
+export function extractRelationsFromGQL(
+  typeMap: Map<string, any>
+): Map<string, Map<string, string>> {
+  const relationMap = new Map()
+
+  // Extract the actual type
+  const getBaseType = (type) => {
+    if (isNonNullType(type) || isListType(type)) {
+      return getBaseType(type.ofType)
+    }
+    return type
+  }
+
+  for (const [typeName, graphqlType] of Object.entries(typeMap)) {
+    if (!isObjectType(graphqlType)) {
+      continue
+    }
+
+    const fields = graphqlType.getFields()
+    const entityRelations = new Map()
+
+    for (const [fieldName, fieldConfig] of Object.entries(fields)) {
+      const fieldType = getBaseType((fieldConfig as any).type)
+
+      // only add relation fields
+      if (isObjectType(fieldType)) {
+        entityRelations.set(fieldName, fieldType.name)
+      }
+    }
+    relationMap.set(typeName, entityRelations)
+  }
+
+  return relationMap
+}

packages/core/utils/src/common/index.ts

@@ -26,6 +26,7 @@ export * from "./get-node-version"
 export * from "./get-selects-and-relations-from-object-array"
 export * from "./get-set-difference"
 export * from "./graceful-shutdown-server"
+export * from "./graphql-relations-entity-map"
 export * from "./group-by"
 export * from "./handle-postgres-database-error"
 export * from "./is-big-number"