Replace DbUnique with the new metadata decorator

Author: CarsonF

src/common/db-unique.decorator.ts

@@ -1,27 +1,21 @@
+import { createMetadataDecorator } from '@seedcompany/nest';
 import { startCase } from 'lodash';
 import { DbLabel } from './db-label.decorator';
-import { AbstractClassType } from './types';
-
-const DbUniqueSymbol = Symbol('DbUnique');
 
 /**
- * This property value should have a unique constraint in database.
- * The property node needs a unique label, which can be given or will based on
+ * This property value should have a unique constraint in the neo4j database.
+ * The property node needs a unique label, which can be given or will be based on
  * the resource & property name.
  */
-export const DbUnique =
-  (label?: string): PropertyDecorator =>
-  (target, propertyKey) => {
-    if (typeof propertyKey === 'symbol') {
-      throw new Error('DbUnique() cannot be used on symbol properties');
-    }
-    label ??= target.constructor.name + startCase(propertyKey);
-    Reflect.defineMetadata(DbUniqueSymbol, label, target, propertyKey);
-    DbLabel(label)(target, propertyKey);
-  };
+export const DbUnique = (label?: string) => (target: object, key: string) => {
+  label ??= target.constructor.name + startCase(key);
+  DbUniqueInner(label)(target, key);
+  DbLabel(label)(target, key);
+};
+
+const DbUniqueInner = createMetadataDecorator({
+  types: ['property'],
+  setter: (label?: string) => label,
+});
 
-export const getDbPropertyUnique = (
-  type: AbstractClassType<unknown>,
-  property: string,
-): string | undefined =>
-  Reflect.getMetadata(DbUniqueSymbol, type.prototype, property);
+DbUnique.get = DbUniqueInner.get;

src/core/database/common.repository.ts

@@ -3,9 +3,9 @@ import { setOf } from '@seedcompany/common';
 import { inArray, node, relation } from 'cypher-query-builder';
 import { DateTime } from 'luxon';
 import {
+  DbUnique,
   EnhancedResource,
   getDbClassLabels,
-  getDbPropertyUnique,
   ID,
   InputException,
   isIdLike,
@@ -175,7 +175,7 @@ export class CommonRepository {
         ? [createUniqueConstraint(getDbClassLabels(resource)[0], 'id')]
         : []),
       ...resource.Props.flatMap((prop) => {
-        const label = getDbPropertyUnique(resource, prop);
+        const label = DbUnique.get(resource, prop);
         return label
           ? createUniqueConstraint(label, 'value', `${resource.name}_${prop}`)
           : [];

src/core/database/dto.repository.ts

@@ -3,8 +3,8 @@ import { inArray, Query } from 'cypher-query-builder';
 import { LazyGetter as Once } from 'lazy-get-decorator';
 import { lowerCase } from 'lodash';
 import {
+  DbUnique,
   EnhancedResource,
-  getDbPropertyUnique,
   ID,
   NotFoundException,
   ResourceShape,
@@ -66,7 +66,7 @@ export const DtoRepository = <
     }
     @Once() private get uniqueLabel() {
       const labels = resource.Props.flatMap(
-        (p) => getDbPropertyUnique(resource, p) ?? [],
+        (p) => DbUnique.get(resource, p) ?? [],
       );
       if (labels.length === 0) {
         return new ServerException(