2023-04-25 11:01:25 +00:00
# @tldraw/tlstore
`tlstore` is a library for creating and managing data.
> In this library, a "record" is an object that is stored under a typed id.
`tlstore` is used by [tldraw ](https://www.tldraw.com ) to store its data.
It is designed to be used with `tlstate` (@tldraw/tlstate).
# Usage
First create types for your records.
```ts
interface Book extends BaseRecord< 'book'> {
title: string
author: ID< Author >
numPages: number
}
interface Author extends BaseRecord< 'author'> {
name: string
isPseudonym: boolean
}
```
Then create your `RecordType` instances.
```ts
const Book = createRecordType< Book > ('book')
const Author = createRecordType< Author > ('author').withDefaultProperties(() => ({
isPseudonym: false,
}))
```
Then create your `RecordStore` instance.
```ts
const store = new RecordStore< Book | Author > ()
```
Then you can create records, add them to the store, update, and remove them.
```ts
const tolkeinId = Author.createCustomId('tolkein')
store.put([
Author.create({
id: jrrTolkeinId,
name: 'J.R.R Tolkein',
}),
])
store.update(tolkeinId, (author) => ({
...author,
name: 'DJJ Tolkz',
isPseudonym: true,
}))
store.remove(tolkeinId)
```
---
# API
## `RecordStore`
The `RecordStore` class is the main class of the library.
```ts
const store = new RecordStore()
```
### `put(records: R[]): void`
Add some records to the store. It's an error if they already exist.
```ts
const record = Author.create({
name: 'J.R.R Tolkein',
id: Author.createCustomId('tolkein'),
})
store.put([record])
```
### `update(id: ID<R>, updater: (record: R) => R): void`
Update a record. To update multiple records at once, use the `update` method of the `TypedRecordStore` class.
```ts
const id = Author.createCustomId('tolkein')
store.update(id, (r) => ({ ...r, name: 'Jimmy Tolks' }))
```
### `remove(ids: ID<R>[]): void`
Remove some records from the store via their ids.
```ts
const id = Author.createCustomId('tolkein')
store.remove([id])
```
### `get(id: ID<R>): R`
Get the value of a store record by its id.
```ts
const id = Author.createCustomId('tolkein')
const result = store.get(id)
```
### `allRecords(): R[]`
Get an array of all values in the store.
```ts
const results = store.allRecords()
```
### `clear(): void`
Remove all records from the store.
```ts
store.clear()
```
### `has(id: ID<R>): boolean`
Get whether the record store has an record stored under the given id.
```ts
const id = Author.createCustomId('tolkein')
const result = store.has(id)
```
### `serialize(filter?: (record: R) => boolean): RecordStoreSnapshot<R>`
Opposite of `deserialize` . Creates a JSON payload from the record store.
```ts
const serialized = store.serialize()
```
```ts
const serialized = store.serialize((record) => record.name === 'J.R.R Tolkein')
```
### `deserialize(snapshot: RecordStoreSnapshot<R>): void`
Opposite of `serialize` . Replace the store's current records with records as defined by a simple JSON structure into the stores.
```ts
const serialized = { ... }
store.deserialize(serialized)
```
### `listen(listener: ((entry: HistoryEntry) => void): () => void`
Add a new listener to the store The store will call the function each time the history changes. Returns a function to remove the listener.
```ts
store.listen((entry) => doSomethingWith(entry))
```
### `mergeRemoteChanges(fn: () => void): void`
Merge changes from a remote source without triggering listeners.
```ts
store.mergeRemoteChanges(() => {
store.put(recordsFromRemoteSource)
})
```
### `createDerivationCache(name: string, derive: ((record: R) => R | undefined)): DerivationCache<R>`
Create a new derivation cache.
```ts
const derivationCache = createDerivationCache('popular_authors', (record) => {
return record.popularity > 62 ? record : undefined
})
```
---
## `RecordType`
The `RecordType` class is used to define the structure of a record.
```ts
const recordType = new RecordType('author', () => ({ living: true }))
```
`RecordType` instances are most often created with `createRecordType` .
### `create(properties: Pick<R, RequiredProperties> & Omit<Partial<R>, RequiredProperties>): R`
Create a new record of this type.
```ts
const record = recordType.create({ name: 'J.R.R Tolkein' })
```
### `clone(record: R): R`
Clone a record of this type.
```ts
const record = recordType.create({ name: 'J.R.R Tolkein' })
const clone = recordType.clone(record)
```
### `createId(): ID<R>`
Create an Id for a record of this type.
```ts
const id = recordType.createId()
```
### `createCustomId(id: string): ID<R>`
Create a custom Id for a record of this type.
```ts
const id = recordType.createCustomId('tolkein')
```
### `isInstance`
Check if a value is an instance of this record type.
```ts
const record = recordType.create({ name: 'J.R.R Tolkein' })
const result1 = recordType.isInstance(record) // true
const result2 = recordType.isInstance(someOtherRecord) // false
```
### `isId`
Check if a value is an id for a record of this type.
```ts
const id = recordType.createCustomId('tolkein')
const result1 = recordType.isId(id) // true
const result2 = recordType.isId(someOtherId) // false
```
### `withDefaultProperties`
Create a new record type with default properties.
```ts
const youngLivingAuthor = new RecordType('author', () => ({ age: 28, living: true }))
const oldDeadAuthor = recordType.withDefaultProperties({ age: 93, living: false })
```
## `RecordStoreQueries`
TODO
## Helpers
### `executeQuery`
TODO
### `DerivationCache`
The `DerivationCache` class is used to create a cache of derived records.
```ts
const derivationCache = new DerivationCache('popular_authors', (record) => {
return record.popularity > 62 ? record : undefined
})
```
### `createRecordType`
A helper used to create a new `RecordType` instance with no default properties.
```ts
const recordType = createRecordType('author'))
```
### `assertIdType`
A helper used to assert that a value is an id for a record of a given type.
```ts
const id = recordType.createCustomId('tolkein')
assertIdType(id, recordType)
```
---
## Types
### `ID`
A type used to represent a record's id.
```ts
const id: ID< Author > = Author.createCustomId('tolkein')
```
### `BaseRecord`
A `BaseRecord` is a record that has an id and a type. It is the base type for all records.
```ts
type AuthorRecord extends BaseRecord< "author"> {
name: string
age: number
living: boolean
}
```
### `RecordsDiff`
A diff describing the changes to a record.
### `CollectionDiff`
A diff describing the changes to a collection.
2023-05-04 12:47:56 +00:00
## License
The source code in this repository (as well as our 2.0+ distributions and releases) are currently licensed under Apache-2.0. These licenses are subject to change in our upcoming 2.0 release. If you are planning to use tldraw in a commercial product, please reach out at [hello@tldraw.com ](mailto://hello@tldraw.com ).
