Merge 8a0684e into 2d9356a

docs/cascading.md

@@ -1,7 +1,7 @@
 ---
 ---
 
-# Cascading persist and remove
+# Cascading persist, merge and remove
 
 When persisting or removing entity, all your references are by default cascade persisted. 
 This means that by persisting any entity, ORM will automatically persist all of its 
@@ -13,25 +13,33 @@ You can control this behaviour via `cascade` attribute of `@ManyToOne`, `@ManyTo
 > New entities without primary key will be always persisted, regardless of `cascade` value. 
 
 ```typescript
-// cascade persist is default value
+// cascade persist & merge is default value
 @OneToMany({ entity: () => Book, fk: 'author' })
 books = new Collection<Book>(this);
 
 // same as previous definition
-@OneToMany({ entity: () => Book, fk: 'author', cascade: [Cascade.PERSIST] })
+@OneToMany({ entity: () => Book, fk: 'author', cascade: [Cascade.PERSIST, Cascade.MERGE] })
 books = new Collection<Book>(this);
 
 // only cascade remove
 @OneToMany({ entity: () => Book, fk: 'author', cascade: [Cascade.REMOVE] })
 books = new Collection<Book>(this);
 
-// cascade persist and remove
+// cascade persist and remove (but not merge)
 @OneToMany({ entity: () => Book, fk: 'author', cascade: [Cascade.PERSIST, Cascade.REMOVE] })
 books = new Collection<Book>(this);
 
 // no cascade
 @OneToMany({ entity: () => Book, fk: 'author', cascade: [] })
 books = new Collection<Book>(this);
+
+// cascade all (persist, merge and remove)
+@OneToMany({ entity: () => Book, fk: 'author', cascade: [Cascade.ALL] })
+books = new Collection<Book>(this);
+
+// same as previous definition
+@OneToMany({ entity: () => Book, fk: 'author', cascade: [Cascade.PERSIST, Cascade.MERGE, Cascade.REMOVE] })
+books = new Collection<Book>(this);
 ```
 
 ## Cascade persist
@@ -49,6 +57,39 @@ await orm.em.persist(book); // all book tags and author will be persisted too
 > When cascade persisting collections, keep in mind only fully initialized collections 
 > will be cascade persisted.
 
+## Cascade merge
+
+When you want to merge entity and all its associations, you can use `Cascade.MERGE`. This
+comes handy when you want to clear identity map (e.g. when importing large number of entities), 
+but you also have to keep your parent entities managed (because otherwise they would be considered
+as new entities and insert-persisted, which would fail with non-unique identifier).
+
+In following example, without having `Author.favouriteBook` set to cascade merge, you would 
+get an error because it would be cascade-inserted with already taken ID. 
+
+```typescript
+const a1 = new Author(...);
+a1.favouriteBook = new Book('the best', ...);
+await orm.em.persistAndFlush(a1); // cascade persists favourite book as well
+
+for (let i = 1; i < 1000; i++) {
+  const book = new Book('...', a1);
+  orm.em.persistLater(book);
+
+  // persist every 100 records
+  if (i % 100 === 0) {
+    await orm.em.flush();
+    orm.em.clear(); // this makes both a1 and his favourite book detached
+    orm.em.merge(a1); // so we need to merge them to prevent cascade-inserts
+
+    // without cascade merge, you would need to manually merge all his associations
+    orm.em.merge(a1.favouriteBook); // not needed with Cascade.MERGE
+  }
+}
+
+await orm.em.flush();
+```
+
 ## Cascade remove
 
 Cascade remove works same way as cascade persist, just for removing entities. Following 

lib/EntityManager.ts

@@ -1,11 +1,11 @@
 import { Configuration, RequestContext, Utils } from './utils';
 import { EntityRepository, EntityAssigner, EntityFactory, EntityLoader, EntityValidator, ReferenceType } from './entity';
 import { UnitOfWork } from './unit-of-work';
-import { FilterQuery, IDatabaseDriver } from './drivers/IDatabaseDriver';
+import { FilterQuery, IDatabaseDriver } from './drivers';
 import { EntityData, EntityName, IEntity, IEntityType, IPrimaryKey } from './decorators';
 import { QueryBuilder, QueryOrder, SmartQueryHelper } from './query';
 import { MetadataStorage } from './metadata';
-import { Connection } from './connections/Connection';
+import { Connection } from './connections';
 
 export class EntityManager {
 
@@ -158,7 +158,13 @@ export class EntityManager {
     return this.driver.aggregate(entityName, pipeline);
   }
 
-  merge<T extends IEntityType<T>>(entityName: EntityName<T>, data: EntityData<T>): T {
+  merge<T extends IEntityType<T>>(entity: T): T;
+  merge<T extends IEntityType<T>>(entityName: EntityName<T>, data: EntityData<T>): T;
+  merge<T extends IEntityType<T>>(entityName: EntityName<T> | T, data?: EntityData<T>): T {
+    if (Utils.isEntity(entityName)) {
+      return this.merge(entityName.constructor.name, entityName as EntityData<T>);
+    }
+
     entityName = Utils.className(entityName);
     const meta = this.metadata[entityName];
 
@@ -167,9 +173,11 @@ export class EntityManager {
     }
 
     const entity = Utils.isEntity<T>(data) ? data : this.getEntityFactory().create<T>(entityName, data, true);
-    this.getUnitOfWork().addToIdentityMap(entity); // add to IM immediately - needed for self-references that can be part of `data`
+
+    // add to IM immediately - needed for self-references that can be part of `data` (and do not trigger cascade merge)
+    this.getUnitOfWork().merge(entity, [entity]);
     EntityAssigner.assign(entity, data, true);
-    this.getUnitOfWork().addToIdentityMap(entity); // add to IM again so we have correct payload saved to change set computation
+    this.getUnitOfWork().merge(entity); // add to IM again so we have correct payload saved to change set computation
 
     return entity;
   }
@@ -192,7 +200,7 @@ export class EntityManager {
     }
 
     const entity = this.getEntityFactory().createReference<T>(entityName, id);
-    this.getUnitOfWork().addToIdentityMap(entity);
+    this.getUnitOfWork().merge(entity);
 
     return entity;
   }

lib/MikroORM.ts

@@ -1,5 +1,5 @@
 import { EntityManager } from './EntityManager';
-import { IDatabaseDriver } from './drivers/IDatabaseDriver';
+import { IDatabaseDriver } from './drivers';
 import { MetadataDiscovery } from './metadata';
 import { Configuration, Logger, Options } from './utils';
 import { EntityMetadata } from './decorators';

lib/decorators/ManyToMany.ts

@@ -14,7 +14,7 @@ export function ManyToMany(options: ManyToManyOptions): Function {
       throw new Error(`'@ManyToMany({ entity: string | Function })' is required in '${target.constructor.name}.${propertyName}'`);
     }
 
-    const property = { name: propertyName, reference: ReferenceType.MANY_TO_MANY, owner: !!options.inversedBy, cascade: [Cascade.PERSIST] };
+    const property = { name: propertyName, reference: ReferenceType.MANY_TO_MANY, owner: !!options.inversedBy, cascade: [Cascade.PERSIST, Cascade.MERGE] };
     meta.properties[propertyName] = Object.assign(property, options) as EntityProperty;
   };
 }

lib/decorators/ManyToOne.ts

@@ -8,7 +8,7 @@ export function ManyToOne(options: ManyToOneOptions = {}): Function {
   return function (target: IEntity, propertyName: string) {
     const meta = MetadataStorage.getMetadata(target.constructor.name);
     Utils.lookupPathFromDecorator(meta);
-    const property = { name: propertyName, reference: ReferenceType.MANY_TO_ONE, cascade: [Cascade.PERSIST] };
+    const property = { name: propertyName, reference: ReferenceType.MANY_TO_ONE, cascade: [Cascade.PERSIST, Cascade.MERGE] };
     meta.properties[propertyName] = Object.assign(property, options) as EntityProperty;
   };
 }

lib/decorators/OneToMany.ts

@@ -14,7 +14,7 @@ export function OneToMany(options: OneToManyOptions): Function {
       throw new Error(`'@OneToMany({ entity: string | Function })' is required in '${target.constructor.name}.${propertyName}'`);
     }
 
-    const property = { name: propertyName, reference: ReferenceType.ONE_TO_MANY, cascade: [Cascade.PERSIST] };
+    const property = { name: propertyName, reference: ReferenceType.ONE_TO_MANY, cascade: [Cascade.PERSIST, Cascade.MERGE] };
     meta.properties[propertyName] = Object.assign(property, options) as EntityProperty;
   };
 }

lib/drivers/AbstractSqlDriver.ts

@@ -1,6 +1,6 @@
 import { EntityData, IEntityType, IPrimaryKey } from '../decorators';
 import { DatabaseDriver } from './DatabaseDriver';
-import { Connection, QueryResult } from '../connections/Connection';
+import { Connection, QueryResult } from '../connections';
 import { ReferenceType } from '../entity';
 import { FilterQuery } from './IDatabaseDriver';
 import { QueryBuilder, QueryOrder } from '../query';

lib/drivers/PostgreSqlDriver.ts

@@ -3,7 +3,7 @@ import { AbstractSqlDriver } from './AbstractSqlDriver';
 import { EntityData, IEntityType } from '../decorators';
 import { QueryType } from '../query';
 import { PostgreSqlPlatform } from '../platforms/PostgreSqlPlatform';
-import { QueryResult } from '../connections/Connection';
+import { QueryResult } from '../connections';
 
 export class PostgreSqlDriver extends AbstractSqlDriver<PostgreSqlConnection> {
 

lib/entity/enums.ts

@@ -7,5 +7,7 @@ export enum ReferenceType {
 
 export enum Cascade {
   PERSIST = 'persist',
+  MERGE = 'merge',
   REMOVE = 'remove',
+  ALL = 'all',
 }

lib/metadata/JavaScriptMetadataProvider.ts

@@ -45,7 +45,7 @@ export class JavaScriptMetadataProvider extends MetadataProvider {
     }
 
     if (prop.reference !== ReferenceType.SCALAR && typeof prop.cascade === 'undefined') {
-      prop.cascade = [Cascade.PERSIST];
+      prop.cascade = [Cascade.PERSIST, Cascade.MERGE];
     }
   }
 

lib/metadata/MetadataDiscovery.ts

@@ -219,7 +219,7 @@ export class MetadataDiscovery {
   }
 
   private definePivotProperty(prop: EntityProperty, name: string): EntityProperty {
-    const ret = { name, type: name, reference: ReferenceType.MANY_TO_ONE, cascade: [Cascade.PERSIST, Cascade.REMOVE] } as EntityProperty;
+    const ret = { name, type: name, reference: ReferenceType.MANY_TO_ONE, cascade: [Cascade.ALL] } as EntityProperty;
 
     if (name === prop.type) {
       const meta = this.metadata[name];

lib/schema/SchemaGenerator.ts

@@ -127,9 +127,10 @@ export class SchemaGenerator {
     const meta2 = this.metadata[prop.type];
     const pk2 = meta2.properties[meta2.primaryKey].fieldName;
     let ret = `REFERENCES ${this.helper.quoteIdentifier(meta2.collection)} (${this.helper.quoteIdentifier(pk2)})`;
-    ret += ` ON DELETE ${prop.cascade.includes(Cascade.REMOVE) ? 'CASCADE' : 'SET NULL'}`;
+    const cascade = prop.cascade.includes(Cascade.REMOVE) || prop.cascade.includes(Cascade.ALL);
+    ret += ` ON DELETE ${cascade ? 'CASCADE' : 'SET NULL'}`;
 
-    if (prop.cascade.includes(Cascade.PERSIST)) {
+    if (prop.cascade.includes(Cascade.PERSIST) || prop.cascade.includes(Cascade.ALL)) {
       ret += ' ON UPDATE CASCADE';
     }
 

lib/unit-of-work/ChangeSetPersister.ts

@@ -3,7 +3,7 @@ import { EntityMetadata, EntityProperty, IEntityType } from '../decorators';
 import { EntityIdentifier } from '../entity';
 import { ChangeSet, ChangeSetType } from './ChangeSet';
 import { IDatabaseDriver } from '..';
-import { QueryResult } from '../connections/Connection';
+import { QueryResult } from '../connections';
 
 export class ChangeSetPersister {
 

lib/unit-of-work/UnitOfWork.ts

@@ -30,12 +30,10 @@ export class UnitOfWork {
 
   constructor(private readonly em: EntityManager) { }
 
-  addToIdentityMap(entity: IEntity, initialized = true): void {
+  merge<T extends IEntityType<T>>(entity: T, visited: IEntity[] = []): void {
     this.identityMap[`${entity.constructor.name}-${entity.__serializedPrimaryKey}`] = entity;
-
-    if (initialized) {
-      this.originalEntityData[entity.__uuid] = Utils.copy(entity);
-    }
+    this.originalEntityData[entity.__uuid] = Utils.copy(entity);
+    this.cascade(entity, Cascade.MERGE, visited);
   }
 
   getById<T extends IEntityType<T>>(entityName: string, id: IPrimaryKey): T {
@@ -179,7 +177,7 @@ export class UnitOfWork {
     await this.changeSetPersister.persistToDatabase(changeSet);
 
     if (changeSet.type !== ChangeSetType.DELETE) {
-      this.em.merge(changeSet.name, changeSet.entity);
+      this.em.merge(changeSet.entity);
     }
 
     await this.runHooks(`after${type}`, changeSet.entity);
@@ -234,7 +232,8 @@ export class UnitOfWork {
     visited.push(entity);
 
     switch (type) {
-      case Cascade.PERSIST: this.persist<T>(entity, visited); break;
+      case Cascade.PERSIST: this.persist(entity, visited); break;
+      case Cascade.MERGE: this.merge(entity, visited); break;
       case Cascade.REMOVE: this.remove(entity, visited); break;
     }
 
@@ -246,7 +245,7 @@ export class UnitOfWork {
   }
 
   private cascadeReference<T extends IEntityType<T>>(entity: T, prop: EntityProperty, type: Cascade, visited: IEntity[]): void {
-    if (!prop.cascade || !prop.cascade.includes(type)) {
+    if (!prop.cascade || !(prop.cascade.includes(type) || prop.cascade.includes(Cascade.ALL))) {
       return;
     }
 

tests/EntityManager.mongo.test.ts

@@ -199,7 +199,7 @@ describe('EntityManagerMongo', () => {
 
   test('should throw when trying to merge entity without id', async () => {
     const author = new Author('test', 'test');
-    expect(() => orm.em.merge(Author, author)).toThrowError('You cannot merge entity without identifier!');
+    expect(() => orm.em.merge(author)).toThrowError('You cannot merge entity without identifier!');
   });
 
   test('fork', async () => {

tests/UnitOfWork.test.ts

@@ -76,7 +76,7 @@ describe('UnitOfWork', () => {
   test('changeSet is null for empty payload', async () => {
     const author = new Author('test', 'test');
     author.id = '00000001885f0a3cc37dc9f0';
-    uow.addToIdentityMap(author); // add entity to IM first
+    uow.merge(author); // add entity to IM first
     const changeSet = await computer.computeChangeSet(author); // then try to persist it again
     expect(changeSet).toBeNull();
     expect(uow.getIdentityMap()).not.toEqual({});