Fix: Entity constructor overrides attributes on projection/selective Get

CHANGELOG.md

@@ -0,0 +1,68 @@
+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [Unreleased]
+
+### Added
+- JSDoc documentation was added to the project ([#40](https://github.com/blazejkustra/dynamode/pull/40))
+- Enhanced entity conversion to handle attribute selection in EntityManager `get()` and `batchGet()` methods
+
+### Changed
+- Bump AWS SDK packages to version 3.883.0 & improve type safety ([#42](https://github.com/blazejkustra/dynamode/pull/40))
+
+### Fixed
+- Fix import example in documentation ([#37](https://github.com/blazejkustra/dynamode/pull/37)) - Thanks @gmreburn!
+
+## [1.5.0] - 2024-08-15
+
+### Added
+- `@attribute.customName()` decorator to set custom names for entity attributes ([#33](https://github.com/blazejkustra/dynamode/pull/33))
+- Tests for `customName` decorator
+
+### Fixed
+- Fixed entity renaming logic
+- Improved code safety and error handling
+
+## [1.4.0] - 2024-07-21
+
+### Added
+- Support for multiple GSI decorators on the same attribute ([#28](https://github.com/blazejkustra/dynamode/pull/28), [#29](https://github.com/blazejkustra/dynamode/pull/29))
+- Allow GSI decorators to decorate both partition and sort keys interchangeably ([#31](https://github.com/blazejkustra/dynamode/pull/31))
+
+### Changed
+- Moved test fixtures to a dedicated catalog
+- Improved test organization and coverage
+
+### Fixed
+- Fixed issue where multiple attribute decorators could not be added to primary keys
+- Fixed typecheck issues
+
+## [1.3.0] - 2024-06-23
+
+### Added
+- Support for decorating an attribute with multiple indexes ([#28](https://github.com/blazejkustra/dynamode/pull/28))
+
+## [1.2.0] - 2024-04-17
+
+### Added
+- Binary data type support ([#26](https://github.com/blazejkustra/dynamode/pull/26))
+
+## [1.1.0] - 2024-04-13
+
+### Fixed
+- Fixed `startAt` fails when querying secondary indices
+
+## [1.0.0] - 2024-03-24
+
+### Added
+- 🎉 Dynamode is now out of beta!
+- DynamoDB stream support ([#21](https://github.com/blazejkustra/dynamode/pull/21))
+
+## Earlier Versions
+
+For changes in earlier versions (< 1.0.0), please refer to the [Git commit history](https://github.com/blazejkustra/dynamode/commits/main).
+

lib/entity/entityManager.ts

@@ -38,6 +38,7 @@ import {
   EntityGetOptions,
   EntityKey,
   EntityPutOptions,
+  EntitySelectedAttributes,
   EntityTransactionDeleteOptions,
   EntityTransactionGetOptions,
   EntityTransactionPutOptions,
@@ -170,10 +171,10 @@ export default function EntityManager<M extends Metadata<E>, E extends typeof En
    * });
    * ```
    */
-  function get(
+  function get<const Attributes extends Array<EntityKey<E>> | undefined = undefined>(
     primaryKey: TablePrimaryKey<M, E>,
-    options?: EntityGetOptions<E> & { return?: 'default' },
-  ): Promise<InstanceType<E>>;
+    options?: EntityGetOptions<E, Attributes> & { return?: 'default' },
+  ): Promise<EntitySelectedAttributes<E, Attributes>>;
 
   /**
    * Retrieves a single item from the table by its primary key, returning the raw AWS response.
@@ -184,7 +185,7 @@ export default function EntityManager<M extends Metadata<E>, E extends typeof En
    */
   function get(
     primaryKey: TablePrimaryKey<M, E>,
-    options: EntityGetOptions<E> & { return: 'output' },
+    options: EntityGetOptions<E, any> & { return: 'output' },
   ): Promise<GetItemCommandOutput>;
 
   /**
@@ -196,7 +197,7 @@ export default function EntityManager<M extends Metadata<E>, E extends typeof En
    */
   function get(
     primaryKey: TablePrimaryKey<M, E>,
-    options: EntityGetOptions<E> & { return: 'input' },
+    options: EntityGetOptions<E, any> & { return: 'input' },
   ): GetItemCommandInput;
 
   /**
@@ -207,10 +208,10 @@ export default function EntityManager<M extends Metadata<E>, E extends typeof En
    * @returns A promise that resolves to the entity instance, raw AWS response, or command input
    * @throws {NotFoundError} When the item is not found and return type is 'default'
    */
-  function get(
+  function get<const Attributes extends Array<EntityKey<E>> | undefined = undefined>(
     primaryKey: TablePrimaryKey<M, E>,
-    options?: EntityGetOptions<E>,
-  ): Promise<InstanceType<E> | GetItemCommandOutput> | GetItemCommandInput {
+    options?: EntityGetOptions<E, Attributes>,
+  ): Promise<EntitySelectedAttributes<E, Attributes> | GetItemCommandOutput> | GetItemCommandInput {
     const { projectionExpression, attributeNames } = buildGetProjectionExpression(options?.attributes);
 
     const commandInput: GetItemCommandInput = {
@@ -237,7 +238,10 @@ export default function EntityManager<M extends Metadata<E>, E extends typeof En
         throw new NotFoundError();
       }
 
-      return convertAttributeValuesToEntity(entity, result.Item);
+      return convertAttributeValuesToEntity(entity, result.Item, options?.attributes) as EntitySelectedAttributes<
+        E,
+        Attributes
+      >;
     })();
   }
 
@@ -624,10 +628,10 @@ export default function EntityManager<M extends Metadata<E>, E extends typeof En
    * });
    * ```
    */
-  function batchGet(
+  function batchGet<const Attributes extends Array<EntityKey<E>> | undefined = undefined>(
     primaryKeys: Array<TablePrimaryKey<M, E>>,
-    options?: EntityBatchGetOptions<E> & { return?: 'default' },
-  ): Promise<EntityBatchGetOutput<M, E>>;
+    options?: EntityBatchGetOptions<E, Attributes> & { return?: 'default' },
+  ): Promise<EntityBatchGetOutput<M, E, Attributes>>;
 
   /**
    * Retrieves multiple items, returning the raw AWS response.
@@ -638,7 +642,7 @@ export default function EntityManager<M extends Metadata<E>, E extends typeof En
    */
   function batchGet(
     primaryKeys: Array<TablePrimaryKey<M, E>>,
-    options: EntityBatchGetOptions<E> & { return: 'output' },
+    options: EntityBatchGetOptions<E, any> & { return: 'output' },
   ): Promise<BatchGetItemCommandOutput>;
 
   /**
@@ -650,7 +654,7 @@ export default function EntityManager<M extends Metadata<E>, E extends typeof En
    */
   function batchGet(
     primaryKeys: Array<TablePrimaryKey<M, E>>,
-    options: EntityBatchGetOptions<E> & { return: 'input' },
+    options: EntityBatchGetOptions<E, any> & { return: 'input' },
   ): BatchGetItemCommandInput;
 
   /**
@@ -660,10 +664,10 @@ export default function EntityManager<M extends Metadata<E>, E extends typeof En
    * @param options - Optional configuration for the batch get operation
    * @returns A promise that resolves to the batch get result, raw AWS response, or command input
    */
-  function batchGet(
+  function batchGet<const Attributes extends Array<EntityKey<E>> | undefined = undefined>(
     primaryKeys: Array<TablePrimaryKey<M, E>>,
-    options?: EntityBatchGetOptions<E>,
-  ): Promise<EntityBatchGetOutput<M, E> | BatchGetItemCommandOutput> | BatchGetItemCommandInput {
+    options?: EntityBatchGetOptions<E, Attributes>,
+  ): Promise<EntityBatchGetOutput<M, E, Attributes> | BatchGetItemCommandOutput> | BatchGetItemCommandInput {
     const { projectionExpression, attributeNames } = buildGetProjectionExpression(options?.attributes);
 
     const commandInput: BatchGetItemCommandInput = {
@@ -701,7 +705,9 @@ export default function EntityManager<M extends Metadata<E>, E extends typeof En
         result.UnprocessedKeys?.[tableName]?.Keys?.map((key) => fromDynamo(key) as TablePrimaryKey<M, E>) || [];
 
       return {
-        items: items.map((item) => convertAttributeValuesToEntity(entity, item)),
+        items: items.map((item) => convertAttributeValuesToEntity(entity, item, options?.attributes)) as Array<
+          EntitySelectedAttributes<E, Attributes>
+        >,
         unprocessedKeys,
       };
     })();

lib/entity/helpers/converters.ts

@@ -7,6 +7,7 @@ import { AttributeValues, fromDynamo, GenericObject, objectToDynamo } from '@lib
 export function convertAttributeValuesToEntity<E extends typeof Entity>(
   entity: E,
   dynamoItem: AttributeValues,
+  selectedAttributes?: Array<string>,
 ): InstanceType<E> {
   const object = fromDynamo(dynamoItem);
   const attributes = Dynamode.storage.getEntityAttributes(entity.name);
@@ -25,7 +26,24 @@ export function convertAttributeValuesToEntity<E extends typeof Entity>(
     object[attribute.propertyName] = truncateValue(entity, attribute.propertyName, value);
   });
 
-  return new entity(object) as InstanceType<E>;
+  const instance = new entity(object) as InstanceType<E>;
+
+  if (selectedAttributes && selectedAttributes.length > 0) {
+    // Remove nested attributes from the selected attributes
+    const selectedAttributesSet = new Set([
+      'dynamodeEntity',
+      ...selectedAttributes.map((attribute) => attribute.split('.')[0]),
+    ]);
+
+    Object.values(attributes)
+      .filter((attribute) => !selectedAttributesSet.has(attribute.propertyName))
+      .forEach((attribute) => {
+        // @ts-expect-error undefined is not assignable to every Entity's property
+        instance[attribute.propertyName] = undefined;
+      });
+  }
+
+  return instance;
 }
 
 export function convertEntityToAttributeValues<E extends typeof Entity>(

lib/entity/types.ts

@@ -1,4 +1,4 @@
-import { RequireAtLeastOne } from 'type-fest';
+import { NonEmptyTuple, RequireAtLeastOne } from 'type-fest';
 
 import {
   BatchGetItemCommandInput,
@@ -61,18 +61,34 @@ export type EntityKey<E extends typeof Entity> = keyof EntityProperties<E> exten
  */
 export type EntityValue<E extends typeof Entity, K extends EntityKey<E>> = FlattenObject<InstanceType<E>>[K];
 
+/**
+ * Helper type to select only specified attributes from an entity instance.
+ * If attributes are not specified, returns the full entity type.
+ *
+ * @template E - The entity class type
+ * @template Attributes - Array of attribute keys to select (optional)
+ */
+export type EntitySelectedAttributes<
+  E extends typeof Entity,
+  Attributes extends Array<EntityKey<E>> | undefined = undefined,
+> =
+  Attributes extends NonEmptyTuple<EntityKey<E>>
+    ? Omit<InstanceType<E>, Exclude<EntityKey<E>, Attributes[number] | 'dynamodeEntity'>>
+    : InstanceType<E>;
+
 /**
  * Options for entity get operations.
  *
  * @template E - The entity class type
+ * @template Attributes - Array of attribute keys to select (optional)
  */
-export type EntityGetOptions<E extends typeof Entity> = {
+export type EntityGetOptions<E extends typeof Entity, Attributes extends Array<EntityKey<E>> | undefined> = {
   /** Additional DynamoDB input parameters */
   extraInput?: Partial<GetItemCommandInput>;
   /** Return type option */
   return?: ReturnOption;
   /** Specific attributes to retrieve */
-  attributes?: Array<EntityKey<E>>;
+  attributes?: Attributes;
   /** Whether to use consistent read */
   consistent?: boolean;
 };
@@ -178,10 +194,13 @@ export type BuildDeleteConditionExpression = {
 
 // entityManager.batchGet
 
-export type EntityBatchGetOptions<E extends typeof Entity> = {
+export type EntityBatchGetOptions<
+  E extends typeof Entity,
+  Attributes extends ReadonlyArray<EntityKey<E>> | undefined = undefined,
+> = {
   extraInput?: Partial<BatchGetItemCommandInput>;
   return?: ReturnOption;
-  attributes?: Array<EntityKey<E>>;
+  attributes?: Attributes;
   consistent?: boolean;
 };
 
@@ -191,8 +210,12 @@ export type EntityBatchDeleteOutput<PrimaryKey> = {
 
 // entityManager.batchGet
 
-export type EntityBatchGetOutput<M extends Metadata<E>, E extends typeof Entity> = {
-  items: Array<InstanceType<E>>;
+export type EntityBatchGetOutput<
+  M extends Metadata<E>,
+  E extends typeof Entity,
+  Attributes extends Array<EntityKey<E>> | undefined = undefined,
+> = {
+  items: Array<EntitySelectedAttributes<E, Attributes>>;
   unprocessedKeys: Array<TablePrimaryKey<M, E>>;
 };
 

lib/query/index.ts

@@ -160,7 +160,7 @@ export default class Query<M extends Metadata<E>, E extends typeof Entity> exten
       } while (all && !!lastKey && count < max);
 
       return {
-        items: items.map((item) => convertAttributeValuesToEntity(this.entity, item)),
+        items: items.map((item) => convertAttributeValuesToEntity(this.entity, item, this.selectedAttributes)),
         lastKey: lastKey && convertAttributeValuesToLastKey(this.entity, lastKey),
         count,
         scannedCount,

lib/retriever/index.ts

@@ -18,6 +18,8 @@ import { AttributeNames, AttributeValues } from '@lib/utils';
 export default class RetrieverBase<M extends Metadata<E>, E extends typeof Entity> extends Condition<E> {
   /** The DynamoDB input object (QueryInput or ScanInput) */
   protected input: QueryInput | ScanInput;
+  /** The list of attributes actually fetched from DynamoDB */
+  protected selectedAttributes: Array<EntityKey<E>> = [];
   /** Attribute names mapping for expression attribute names */
   protected attributeNames: AttributeNames = {};
   /** Attribute values mapping for expression attribute values */
@@ -165,6 +167,7 @@ export default class RetrieverBase<M extends Metadata<E>, E extends typeof Entit
       attributes,
       this.attributeNames,
     ).projectionExpression;
+    this.selectedAttributes = attributes;
     return this;
   }
 }

lib/scan/index.ts

@@ -113,7 +113,7 @@ export default class Scan<M extends Metadata<E>, E extends typeof Entity> extend
       const items = result.Items || [];
 
       return {
-        items: items.map((item) => convertAttributeValuesToEntity(this.entity, item)),
+        items: items.map((item) => convertAttributeValuesToEntity(this.entity, item, this.selectedAttributes)),
         count: result.Count || 0,
         scannedCount: result.ScannedCount || 0,
         lastKey: result.LastEvaluatedKey

package.json

@@ -1,6 +1,6 @@
 {
   "name": "dynamode",
-  "version": "1.5.1-rc.0",
+  "version": "1.6.0-rc.1",
   "description": "Dynamode is a modeling tool for Amazon's DynamoDB",
   "main": "index.js",
   "types": "index.d.ts",

tests/e2e/entity/batchGet.test.ts

@@ -1,6 +1,6 @@
 import { afterAll, beforeAll, describe, expect, test, vi } from 'vitest';
 
-import { MockEntityManager, TEST_TABLE_NAME, TestTableManager } from '../../fixtures/TestTable';
+import { MockEntity, MockEntityManager, TEST_TABLE_NAME, TestTableManager } from '../../fixtures/TestTable';
 import { mockEntityFactory } from '../mockEntityFactory';
 
 describe('EntityManager.batchGet', () => {
@@ -84,15 +84,15 @@ describe('EntityManager.batchGet', () => {
       expect(mocks).not.toEqual([mock1, mock2, mock3]);
       expect(mocks[0].number).toEqual(1);
       expect(mocks[0].string).toEqual('string');
-      expect(mocks[0].object).toEqual(undefined);
+      expect((mocks[0] as MockEntity).object).toEqual(undefined);
 
       expect(mocks[1].number).toEqual(1);
       expect(mocks[1].string).toEqual('string');
-      expect(mocks[1].object).toEqual(undefined);
+      expect((mocks[1] as MockEntity).object).toEqual(undefined);
 
       expect(mocks[2].number).toEqual(1);
       expect(mocks[2].string).toEqual('string');
-      expect(mocks[2].object).toEqual(undefined);
+      expect((mocks[2] as MockEntity).object).toEqual(undefined);
     });
   });
 });