fix: rebuild indices after collection instantiation

this enables seeding the collection with a memory adapater that already has data in it
see #626 (reply in thread)

packages/signaldb/__tests__/Collection.spec.ts

@@ -464,4 +464,14 @@ describe('Collection', () => {
  emitSpy.mockRestore()
  })
  })
+
+ describe('misc', () => {
+ it('should seed the collection with initial data from the memory adapter', () => {
+ const col = new Collection<{ id: string, name: string }>({
+ memory: createMemoryAdapter([{ id: '1', name: 'John' }]),
+ })
+
+ expect(col.findOne({ id: '1' })).toEqual({ id: '1', name: 'John' })
+ })
+ })
 })

packages/signaldb/src/Collection/index.ts

@@ -105,6 +105,7 @@ export default class Collection<T extends BaseItem<I> = BaseItem, I = any, U = T
  createExternalIndex('id', this.idIndex),
  ...(this.options.indices || []),
  ]
+ this.rebuildIndices()
  if (this.options.persistence) {
  const persistenceAdapter = this.options.persistence
  this.persistenceAdapter = persistenceAdapter
@@ -263,6 +264,11 @@ export default class Collection<T extends BaseItem<I> = BaseItem, I = any, U = T
  private rebuildIndicesOncePerTick = executeOncePerTick(this.rebuildAllIndices.bind(this))
 
  private rebuildAllIndices() {
+ this.idIndex.clear()
+ // eslint-disable-next-line array-callback-return
+ this.memory().map((item, index) => {
+ this.idIndex.set(serializeValue(item.id), new Set([index]))
+ })
  this.indexProviders.forEach(index => index.rebuild(this.memoryArray()))
  this.indicesOutdated = false
  }