Add the ability to get resource by an EdgeDB FQN

Author: CarsonF

src/common/resource.dto.ts

@@ -247,6 +247,10 @@ export class EnhancedResource<T extends ResourceShape<any>> {
     return type;
   }
 
+  get dbFQN(): (T['DB'] & {})['__element__']['__name__'] {
+    return this.db.__element__.__name__;
+  }
+
   @Once()
   get dbLabels() {
     return getDbClassLabels(this.type);

src/core/resources/resources.host.ts

@@ -1,6 +1,6 @@
 import { Injectable } from '@nestjs/common';
 import { GraphQLSchemaHost } from '@nestjs/graphql';
-import { CachedByArg } from '@seedcompany/common';
+import { CachedByArg, mapKeys } from '@seedcompany/common';
 import { isObjectType } from 'graphql';
 import { mapValues } from 'lodash';
 import { LiteralUnion, ValueOf } from 'type-fest';
@@ -42,6 +42,7 @@ export class ResourcesHost {
     return Object.keys(map) as Array<keyof ResourceMap>;
   }
 
+  @CachedByArg()
   async getEnhancedMap(): Promise<EnhancedResourceMap> {
     const map = await this.getMap();
     return mapValues(map, EnhancedResource.of) as any;
@@ -66,6 +67,36 @@ export class ResourcesHost {
     return await this.getByName(name as any);
   }
 
+  async getByEdgeDB(
+    fqn: string,
+  ): Promise<EnhancedResource<ValueOf<ResourceMap>>> {
+    fqn = fqn.includes('::') ? fqn : `default::${fqn}`;
+    const map = await this.edgeDBFQNMap();
+    const resource = map.get(fqn);
+    if (!resource) {
+      throw new ServerException(
+        `Unable to determine resource from ResourceMap for EdgeDB FQN: ${fqn}`,
+      );
+    }
+    return resource;
+  }
+
+  @CachedByArg()
+  private async edgeDBFQNMap() {
+    const map = await this.getEnhancedMap();
+    const fqnMap = mapKeys(
+      map as Record<string, EnhancedResource<any>>,
+      (_, r, { SKIP }) => {
+        try {
+          return r.dbFQN;
+        } catch (e) {
+          return SKIP;
+        }
+      },
+    ).asMap;
+    return fqnMap;
+  }
+
   async verifyImplements(resource: ResourceLike, theInterface: ResourceLike) {
     const iface = await this.enhance(theInterface);
     if (!(await this.doesImplement(resource, iface))) {