@mojule/entity-app
v0.4.3
Published
Manage data entities
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entity-app
Manage data entities - WARNING this is very much a work in progress
overview
A system for creating, editing, displaying and generally managing "Entities"
An Entity is essentially a model description - at minimum, a typescript type
It is most useful when the entities in this system exist twice, once as ts types and once as JSON Schema
You can just write ts types, you could manually write both, or you could avoid a considerable amount of duplication by writing json schema first and using this package to derive the ts types:
https://www.npmjs.com/package/json-schema-to-ts
define entities
Just using typescript types - example later in document shows how to do it using json schema
import { DbRefFor, EntityKeys } from '@mojule/entity-app'
export type DbFoo = {
name: string
value: number
}
export type Foo = DbFoo
export type DbBar = DbFoo & {
foo?: DbRefFor<FooBarEntityMap,'foo'>
}
export type Bar = Foo & {
foo?: Foo
}
export type FooBarEntityMap = {
foo: DbFoo
bar: DbBar
}
export type FooBarModelMap = {
foo: Foo
bar: Bar
}
export const fooBarEntityKeys: EntityKeys<FooBarEntityMap> = {
foo: 'foo',
bar: 'bar'
}
data stores
- memory
- fs
@mojule/entity-app-server
- mongodb
@mojule/entity-app-mongo-db
- level
@mojule/entity-app-level-db
import {
createDefaultDbItem, createMemoryDb, resolveRefsShallow
} from '@mojule/entity-app'
import { fooBarEntityKeys, FooBarEntityMap, FooBarModelMap } from './types'
type Mod = FooBarModelMap
type Ent = FooBarEntityMap
const start = async () => {
const db = await createMemoryDb(
'my db', fooBarEntityKeys, createDefaultDbItem
)
const { foo, bar } = db.collections
const fooId = await foo.create({ name: 'a', value: 0 })
const barId = await bar.create({
name: 'b', value: 1,
foo: {
_collection: 'foo',
_id: fooId
}
})
await bar.save({ _id: barId, value: 2 })
const dbBar = await bar.load( barId )
console.log( JSON.stringify( dbBar, null, 2 ) )
/*
{
"_id": "7bfbcb66d0f75071ba655c0f",
"name": "b",
"value": 2,
"foo": {
"_collection": "foo",
"_id": "6dcdc64768366e5190521b3b"
}
}
*/
await foo.save({ _id: fooId, value: 5 })
const barModel = await resolveRefsShallow<Mod,Ent,'bar'>( db, dbBar )
console.log( JSON.stringify( barModel, null, 2 ) )
/*
{
"_id": "7bfbcb66d0f75071ba655c0f",
"name": "b",
"value": 2,
"foo": {
"_id": "6dcdc64768366e5190521b3b",
"name": "a",
"value": 5
}
}
*/
}
start().catch( console.error )
data store proxies
- metadata
- filesystem like, atime, ctime, mtime etc, updated as db accessed
- secure
- similar to linux file permissions, manage access to collections and entities via users and groups
- unique
- ensure unique indexes on given fields
- validator
- validate entities as they enter the store, or optionally on load
metadata proxy
import { createMemoryDb, resolveRefsShallow } from '..'
import { createMetadataDbItem, metadataDbFactory } from '../db/proxies/metadata'
import { fooBarEntityKeys, FooBarEntityMap, FooBarModelMap } from './types'
import { populateDb } from './util'
type Mod = FooBarModelMap
type Ent = FooBarEntityMap
const start = async () => {
const memDb = await createMemoryDb(
'my metadata db', fooBarEntityKeys, createMetadataDbItem
)
const db = metadataDbFactory( memDb )
await populateDb( db )
const { bar } = db.collections
const dbBar = await bar.findOne({})
if( dbBar === undefined ) throw Error( 'expected dbBar' )
console.log( JSON.stringify( dbBar, null, 2 ) )
/*
{
"_id": "97d207e825be34fab9c385be",
"_ver": 1,
"_atime": 1626922530649,
"_ctime": 1626922530649,
"_mtime": 1626922530649,
"name": "b",
"value": 2,
"foo": {
"_collection": "foo",
"_id": "9b0d5f3d95628b12b96f1a98"
}
}
*/
const barModel = await resolveRefsShallow<Mod,Ent,'bar'>( db, dbBar )
console.log( JSON.stringify( barModel, null, 2 ) )
/*
{
"_id": "97d207e825be34fab9c385be",
"_ver": 1,
"_atime": 1626922530649,
"_ctime": 1626922530649,
"_mtime": 1626922530649,
"name": "b",
"value": 2,
"foo": {
"_id": "9b0d5f3d95628b12b96f1a98",
"_ver": 1,
"_atime": 1626922530652,
"_ctime": 1626922530648,
"_mtime": 1626922530649,
"name": "a",
"value": 5
}
}
*/
}
start().catch( console.error )
secure proxy
import {
createMemoryDb, resolveRefsShallow, secureDbFactory, createSecureDbItem,
LoginUser, secureEntityKeys, SecureEntityMap, EntityKeys
} from '@mojule/entity-app'
import { dbItemToEntity } from '../db/db-item-to-entity'
import { DbFoo, fooBarEntityKeys, FooBarEntityMap, FooBarModelMap } from './types'
import { populateDb } from './util'
type Models = FooBarModelMap
type Ents = FooBarEntityMap & SecureEntityMap
const secureFooBarEntityKeys: EntityKeys<Ents> = {
...secureEntityKeys,
...fooBarEntityKeys
}
const start = async () => {
const root: LoginUser = { name: 'root', password: 'goobers' }
const bob: LoginUser = { name: 'Bob', password: 'boogers' }
const memDb = await createMemoryDb(
'my secure db', secureFooBarEntityKeys, createSecureDbItem
)
const login = await secureDbFactory( memDb, root )
// login as root and set up users, groups and permissions
const rootDb = await login( root )
// don't populate until you have a store
await populateDb( rootDb )
const { foo: rootFoo, bar: rootBar } = rootDb.collections
const fooIds = await rootFoo.ids()
const barIds = await rootBar.ids()
await rootDb.createUser( bob )
await rootDb.createGroup( 'bobs' )
await rootDb.addUserToGroups( 'Bob', 'bobs' )
await rootDb.chgrp( 'bobs', 'foo' )
await rootDb.chgrp( 'bobs', 'bar' )
await rootDb.chmod( 0o0770, 'foo' )
await rootDb.chmod( 0o0770, 'bar' )
for( const fooId of fooIds ){
await rootDb.chgrp( 'bobs', 'foo', fooId )
await rootDb.chmod( 0o0770, 'foo', fooId )
}
for( const barId of barIds ){
await rootDb.chgrp( 'bobs', 'bar', barId )
await rootDb.chmod( 0o0770, 'bar', barId )
}
// login as bob - we should be allowed to access foo and bar
const bobDb = await login( bob )
const { foo: bobFoo, bar: bobBar } = bobDb.collections
const firstDbFoo = await bobFoo.findOne({})
if( firstDbFoo === undefined ) throw Error( 'Expected firstDbFoo' )
await bobFoo.save({ _id: firstDbFoo._id, value: 7 })
const firstDbBar = await bobBar.findOne({})
if( firstDbBar === undefined ) throw Error( 'Expected firstDbBar' )
// remove any metadata that we don't want resolved in the model
const dbBarEntity = dbItemToEntity( firstDbBar )
const barModel = await resolveRefsShallow<Models,Ents,'bar'>(
bobDb, dbBarEntity
)
// note that the resolved foo property on bar still has metadata
console.log( JSON.stringify( barModel, null, 2 ) )
/*
{
"_id": "8429f2ed5d5f257897544d68",
"name": "b",
"value": 2,
"foo": {
"_id": "70636266f2e8c323caa51d5d",
"_ver": 0,
"_atime": 1626926136316,
"_ctime": 1626926136316,
"_mtime": 1626926136316,
"_group": {
"_id": "011664236e52c03b06329ed4",
"_collection": "group"
},
"_owner": {
"_id": "9ccb30147c8792f12868125f",
"_collection": "user"
},
"_mode": 504,
"name": "a",
"value": 7
}
}
*/
}
start().catch( console.error )
types from schema
import { FromSchema } from 'json-schema-to-ts'
import { EntityKeys, refFactory } from '@mojule/entity-app'
export const fooSchema = {
$id: '#/foo',
type: 'object',
properties: {
name: { type: 'string' },
value: { type: 'number' }
},
required: [ 'name', 'value' ]
} as const
const createDbRef = refFactory( '#' )
export const barSchema = {
$id: '#/bar',
type: 'object',
properties: {
...fooSchema.properties,
foo: createDbRef( 'foo' )
},
required: [ 'name', 'value' ]
} as const
export type DbFoo = FromSchema<typeof fooSchema>
export type Foo = DbFoo
export type DbBar = FromSchema<typeof barSchema>
export type Bar = Foo & {
foo?: Foo
}
export type FooBarEntityMap = {
foo: DbFoo
bar: DbBar
}
export type FooBarModelMap = {
foo: Foo
bar: Bar
}
export const fooBarEntityKeys: EntityKeys<FooBarEntityMap> = {
foo: 'foo',
bar: 'bar'
}
rest apis
url paths for route tree generated from and backed by data store + proxies
- for express
@mojule/entity-app-server
- for SPA, via
@mojule/spa-app
,@mojule/entity-app-client
client side admin
@mojule/entity-app-client
view / templating
@mojule/dom
@mojule/dom-components
License
MIT License
Copyright (c) 2021 Nik Coughlin
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.