Migrate to a monorepo structure (#2909)

packages/twenty-server/src/metadata/object-metadata/hooks/before-delete-one-object.hook.ts

@@ -0,0 +1,49 @@
+import {
+  BadRequestException,
+  Injectable,
+  UnauthorizedException,
+} from '@nestjs/common';
+
+import {
+  BeforeDeleteOneHook,
+  DeleteOneInputType,
+} from '@ptc-org/nestjs-query-graphql';
+
+import { ObjectMetadataService } from 'src/metadata/object-metadata/object-metadata.service';
+
+@Injectable()
+export class BeforeDeleteOneObject implements BeforeDeleteOneHook<any> {
+  constructor(readonly objectMetadataService: ObjectMetadataService) {}
+
+  async run(
+    instance: DeleteOneInputType,
+    context: any,
+  ): Promise<DeleteOneInputType> {
+    const workspaceId = context?.req?.user?.workspace?.id;
+
+    if (!workspaceId) {
+      throw new UnauthorizedException();
+    }
+
+    const objectMetadata =
+      await this.objectMetadataService.findOneWithinWorkspace(workspaceId, {
+        where: {
+          id: instance.id.toString(),
+        },
+      });
+
+    if (!objectMetadata) {
+      throw new BadRequestException('Object does not exist');
+    }
+
+    if (!objectMetadata.isCustom) {
+      throw new BadRequestException("Standard Objects can't be deleted");
+    }
+
+    if (objectMetadata.isActive) {
+      throw new BadRequestException("Active objects can't be deleted");
+    }
+
+    return instance;
+  }
+}