redux-orm-typesafe-schema v0.0.16

redux-orm-typesafe-schema

!!! NO LONGER SUPPORTED - USE LATEST @types/redux-orm DECLARATIONS INSTEAD

A small type-safe wrapper around redux-orm.

Features:

• typed Models
• typed static Repositories
• typed QuerySet
• redux-orm Session with inferred Model types

Install

npm

npm install --save redux-orm-typesafe-schema

yarn

yarn add redux-orm-typesafe-schema

Usage

Follow steps below to define typesafe redux-orm schema.

Refer to spec case for complete example.

1. Define entities

Extends Entity class to define schema:

import {Entity} from 'redux-orm-typesafe-schema'

class Book extends Entity<Book> {
  modelName = 'Book' as const //required modelName mapping to redux-orm static modelName
  id = this.attribute<string>() //required id attribute
}

2. Define fields and relations

import {Entity} from 'redux-orm-typesafe-schema'

// extend Entity class
class Book extends Entity<Book> {
  modelName = 'Book' as const 
  id = this.attribute<string>() 
  
  // an optional default value supplier may be provided
  title = this.attribute<string>(() => 'Gone With The Wind') 
  
  // attributes and relations can be optional
  // optionality is enforced further on when using models
  year? = this.attribute<number>()  
  
  // serializable structures may be used as attributes 
  links = this.attribute<{ 
    description?: string
    cover?: string
  }>()
  
  // available relations include: 
  // - oneToOne 
  // - oneToMany
  // - manyToOne
  // - manyToMany
  // contrary to redux-orm API, relation properties have to be defined on both sides of relationship
   
  // one to one relation
  // ref call takes backwards relation field name as argument and is typechecked for integrity
  isbn? = this.oneToOne(ISBN).ref('book')
  
  // many to one relation 
  genre = this.manyToOne(Genre).ref('books') 
  
  // many to many relation 
  // for many to many relations, ref call takes two arguments: fields on both backwards and through Models 
  authors = this.manyToMany(Person)
    .through(Authorship)
    .ref('books', 'book')
  }
}

3. Define reducers

Example uses utilities from typesafe-actions module. Any standard redux actions may be used.

import {Entity} from 'redux-orm-typesafe-schema'
import * as actions from './actions'
import {ActionType} from 'typesafe-actions'

type RootAction = ActionType<typeof actions>

class Book extends Entity<Book> {
  modelName = 'Book' as const 
  id = this.attribute<string>() 
  title = this.attribute<string>(() => 'Gone With The Wind') 
  year? = this.attribute<number>()  
  links = this.attribute<{ 
    description?: string
    cover?: string
  }>()
  isbn? = this.oneToOne(ISBN).ref('book')
  genre = this.manyToOne(Genre).ref('books') 
  authors = this.manyToMany(Person)
    .through(Authorship)
    .ref('books', 'book')
  }
  
  // enforce type safety by constraining action type
  // second argument is a mapped Repository type 
  // Repository is a typed, mapped type counterpart of a static functionality of redux-orm Model class 
  reduce(action: RootAction, repository: Repository<Book>) {
    switch (action.type) {
      case getType(actions.insertBook):
        repository.create(action.payload)
        break
      case getType(actions.updateBook):
        repository.upsert(action.payload)
        break
      default:
        break
    }   
  }
}

4. Redux integration

4.1. Define actions

import { createStandardAction } from 'typesafe-actions'

// mapped type which makes properties optional with an exception of id property
import { UpdatePayload } from 'redux-orm-typesafe-schema'

type BookPayload = {
  id: string
  isbn: string
  title: string
  year?: number
  authors: string[]
  genre: string
  links: {
    description?: string
    cover?: string
  }
}

export const insertBook = createStandardAction('INSERT_BOOK').map(
  (book: BookPayload) => ({ payload: book })
)

export const updateBook = createStandardAction('UPDATE_BOOK').map(
  (book: UpdatePayload<BookPayload>) => ({ payload: book })
)

4.2. Configure store and root orm reducer

import { Orm, createReducer, register } from 'redux-orm-typesafe-schema'
import { combineReducers, createStore } from 'redux'
 
// import entity classes
import { Authorship, Book, Genre, Person, ISBN } from './my-schema'
 

// initialize orm instance
const orm = new Orm()

// register entities
const session = register(orm, {
  Book,
  Person,
  Authorship,
  Genre,
  ISBN
})


// initialize orm reducer 
const db = createReducer(orm)

// initialize root reducer
const rootReducer = combineReducers<any, any>({
  db 
  // ...other reducers
})

// create redux store
const store = createStore(rootReducer)

4.3. Typed selectors

import { createSelector, register, createReducer, Orm} from 'redux-orm-typesafe-schema'
import { Authorship, Book, Genre, Person, ISBN } from './my-schema'
import {combineReducers, createStore} from 'redux'

const orm = new Orm()

const session = register(orm, {
  Book,
  Person,
  Authorship,
  Genre,
  ISBN
})

const rootReducer = combineReducers<any, any>({
  db :createReducer(orm)
})

const store = createStore(rootReducer)

// extract Session type from registered session instance 
type Session = typeof session

// session contains all Model classes
// Model classes are strictly typed according to registered entity definitions 
const bookWithAuthorsSelector = (session: Session) => session.Book.all()
                                      .toModelArray()
                                      .map(bookModel => ({
                                        ...bookModel.ref,
                                        authors: bookModel.authors.toRefArray()
                                      }))
// create ORM selector                                 
const selector = createSelector(
  orm,
  bookWithAuthorsSelector
)

// selector requires state's orm db branch as input
const bookWithAuthorsData = selector(store.getState().db)