import utils from './utils'
import {
belongsToType,
hasManyType,
hasOneType
} from './decorators'
import {proxiedMapperMethods, Container} from './Container'
import LinkedCollection from './LinkedCollection'
const DOMAIN = 'DataStore'
const proxiedCollectionMethods = [
'add',
'between',
'createIndex',
'filter',
'get',
'getAll',
'query',
'toJson'
]
const ownMethodsForScoping = [
'addToCache',
'cachedFind',
'cachedFindAll',
'cacheFind',
'cacheFindAll',
'hashQuery'
]
const safeSet = function (record, field, value) {
if (record && record._set) {
record._set(field, value)
} else {
utils.set(record, field, value)
}
}
const cachedFn = function (name, hashOrId, opts) {
const cached = this._completedQueries[name][hashOrId]
if (utils.isFunction(cached)) {
return cached(name, hashOrId, opts)
}
return cached
}
const props = {
constructor: function DataStore (opts) {
utils.classCallCheck(this, DataStore)
DataStore.__super__.call(this, opts)
this.collectionClass = this.collectionClass || LinkedCollection
this._collections = {}
this._pendingQueries = {}
this._completedQueries = {}
return this
},
_callSuper (method, ...args) {
return this.constructor.__super__.prototype[method].apply(this, args)
},
/**
* TODO
*
* @name DataStore#_end
* @method
* @private
* @param {string} name Name of the {@link LinkedCollection} to which to
* add the data.
* @param {Object} data TODO.
* @param {Object} [opts] Configuration options.
* @returns {(Object|Array)} Result.
*/
_end (name, result, opts) {
let _data = opts.raw ? result.data : result
if (_data && utils.isFunction(this.addToCache)) {
_data = this.addToCache(name, _data, opts)
if (opts.raw) {
result.data = _data
} else {
result = _data
}
}
return result
},
/**
* Register a new event listener on this DataStore.
*
* Proxy for {@link Container#on}. If an event was emitted by a Mapper or
* Collection in the DataStore, then the name of the Mapper or Collection will
* be prepended to the arugments passed to the provided event handler.
*
* @name DataStore#on
* @method
* @param {string} event Name of event to subsribe to.
* @param {Function} listener Listener function to handle the event.
* @param {*} [ctx] Optional content in which to invoke the listener.
*/
/**
* Used to bind to events emitted by collections in this store.
*
* @name DataStore#_onCollectionEvent
* @method
* @private
* @param {string} name Name of the collection that emitted the event.
* @param {...*} [args] Args passed to {@link Collection#emit}.
*/
_onCollectionEvent (name, ...args) {
const type = args.shift()
this.emit(type, name, ...args)
},
/**
* TODO
*
* @name DataStore#addToCache
* @method
* @param {string} name - Name of the {@link Mapper} to target.
* @param {*} data - Data from which data should be selected for add.
* @param {Object} [opts] - Configuration options.
*/
addToCache (name, data, opts) {
return this.getCollection(name).add(data, opts)
},
/**
* Return a store scoped to a particular mapper/collection pair.
*
* @example
* import {DataStore} from 'js-data'
* const store = new DataStore()
* const UserMapper = store.defineMapper('user')
* const UserStore = store.as('user')
*
* const user1 = store.createRecord('user', { name: 'John' })
* const user2 = UserStore.createRecord({ name: 'John' })
* const user3 = UserMapper.createRecord({ name: 'John' })
* assert.deepEqual(user1, user2)
* assert.deepEqual(user2, user3)
* assert.deepEqual(user1, user3)
*
* @method DataStore#as
* @param {string} name Name of the {@link Mapper}.
* @returns {Object} A store scoped to a particular mapper/collection pair.
* @since 3.0.0
*/
as (name) {
const props = {}
ownMethodsForScoping.forEach(function (method) {
props[method] = {
writable: true,
value: function (...args) {
return this[method](name, ...args)
}
}
})
proxiedMapperMethods.forEach(function (method) {
props[method] = {
writable: true,
value: function (...args) {
return this.getMapper(name)[method](...args)
}
}
})
props.getMapper = {
writable: true,
value: () => this.getMapper(name)
}
proxiedCollectionMethods.forEach(function (method) {
props[method] = {
writable: true,
value: function (...args) {
return this.getCollection(name)[method](...args)
}
}
})
props.getCollection = {
writable: true,
value: () => this.getCollection(name)
}
return Object.create(this, props)
},
/**
* Retrieve a cached `find` result, if any.
*
* @name DataStore#cachedFind
* @method
* @param {string} name The `name` argument passed to {@link DataStore#find}.
* @param {(string|number)} id The `id` argument passed to {@link DataStore#find}.
* @param {Object} opts The `opts` argument passed to {@link DataStore#find}.
*/
cachedFind: cachedFn,
/**
* Retrieve a cached `findAll` result, if any.
*
* @name DataStore#cachedFindAll
* @method
* @param {string} name The `name` argument passed to {@link DataStore#findAll}.
* @param {string} hash The result of calling {@link DataStore#hashQuery} on
* the `query` argument passed to {@link DataStore#findAll}.
* @param {Object} opts The `opts` argument passed to {@link DataStore#findAll}.
*/
cachedFindAll: cachedFn,
/**
* Cache a `find` result. The default implementation does the following:
*
* ```
* // Find and return the record from the data store
* return this.get(name, id)
* ```
*
* Override this method to customize.
*
* @name DataStore#cacheFind
* @method
* @param {string} name The `name` argument passed to {@link DataStore#find}.
* @param {*} data The result to cache.
* @param {(string|number)} id The `id` argument passed to {@link DataStore#find}.
* @param {Object} opts The `opts` argument passed to {@link DataStore#find}.
*/
cacheFind (name, data, id, opts) {
this._completedQueries[name][id] = (name, id, opts) => this.get(name, id)
},
/**
* Cache a `findAll` result. The default implementation does the following:
*
* ```
* // Find and return the records from the data store
* return this.filter(name, utils.fromJson(hash))
* ```
*
* Override this method to customize.
*
* @name DataStore#cacheFindAll
* @method
* @param {string} name The `name` argument passed to {@link DataStore#findAll}.
* @param {*} data The result to cache.
* @param {string} hash The result of calling {@link DataStore#hashQuery} on
* the `query` argument passed to {@link DataStore#findAll}.
* @param {Object} opts The `opts` argument passed to {@link DataStore#findAll}.
*/
cacheFindAll (name, data, hash, opts) {
this._completedQueries[name][hash] = (name, hash, opts) => this.filter(name, utils.fromJson(hash))
},
clear () {
const removed = {}
utils.forOwn(this._collections, (collection, name) => {
removed[name] = collection.removeAll()
})
return removed
},
/**
* TODO
*
* @name DataStore#create
* @method
* @param {string} name Name of the {@link Mapper} to target.
* @param {Object} record Passed to {@link Mapper#create}.
* @param {Object} [opts] Passed to {@link Mapper#create}. See
* {@link Mapper#create} for more configuration options.
* @returns {Promise}
*/
create (name, record, opts) {
opts || (opts = {})
return this._callSuper('create', name, record, opts)
.then((result) => this._end(name, result, opts))
},
/**
* TODO
*
* @name DataStore#createMany
* @method
* @param {string} name Name of the {@link Mapper} to target.
* @param {Array} records Passed to {@link Mapper#createMany}.
* @param {Object} [opts] Passed to {@link Mapper#createMany}. See
* {@link Mapper#createMany} for more configuration options.
* @returns {Promise}
*/
createMany (name, records, opts) {
opts || (opts = {})
return this._callSuper('createMany', name, records, opts)
.then((result) => this._end(name, result, opts))
},
defineMapper (name, opts) {
// Complexity of this method is beyond simply using => functions to bind context
const self = this
const mapper = utils.getSuper(self).prototype.defineMapper.call(self, name, opts)
self._pendingQueries[name] = {}
self._completedQueries[name] = {}
mapper.relationList || Object.defineProperty(mapper, 'relationList', { value: [] })
// The datastore uses a subclass of Collection that is "datastore-aware"
const collection = self._collections[name] = new self.collectionClass(null, { // eslint-disable-line
// Make sure the collection has somewhere to store "added" timestamps
_added: {},
// Give the collection a reference to this datastore
datastore: self,
// The mapper tied to the collection
mapper
})
const schema = mapper.schema || {}
const properties = schema.properties || {}
// TODO: Make it possible index nested properties?
utils.forOwn(properties, function (opts, prop) {
if (opts.indexed) {
collection.createIndex(prop)
}
})
// Create a secondary index on the "added" timestamps of records in the
// collection
collection.createIndex('addedTimestamps', ['$'], {
fieldGetter (obj) {
return collection._added[collection.recordId(obj)]
}
})
collection.on('all', function (...args) {
self._onCollectionEvent(name, ...args)
})
const idAttribute = mapper.idAttribute
mapper.relationList.forEach(function (def) {
const relation = def.relation
const localField = def.localField
const path = `links.${localField}`
const foreignKey = def.foreignKey
const type = def.type
const updateOpts = { index: foreignKey }
let descriptor
const getter = function () { return this._get(path) }
if (type === belongsToType) {
if (!collection.indexes[foreignKey]) {
collection.createIndex(foreignKey)
}
descriptor = {
get: getter,
set (record) {
const _self = this
const current = this._get(path)
if (record === current) {
return current
}
const id = utils.get(_self, idAttribute)
const inverseDef = def.getInverse(mapper)
if (record) {
const relatedIdAttribute = def.getRelation().idAttribute
const relatedId = utils.get(record, relatedIdAttribute)
// Prefer store record
if (!utils.isUndefined(relatedId)) {
record = self.get(relation, relatedId) || record
}
// Set locals
_self._set(path, record)
safeSet(_self, foreignKey, relatedId)
collection.updateIndex(_self, updateOpts)
// Update (set) inverse relation
if (inverseDef.type === hasOneType) {
utils.set(record, inverseDef.localField, _self)
} else if (inverseDef.type === hasManyType) {
const children = utils.get(record, inverseDef.localField)
utils.noDupeAdd(children, _self, function (_record) {
return id === utils.get(_record, idAttribute)
})
}
} else {
// Unset locals
_self._set(path, undefined)
safeSet(_self, foreignKey, undefined)
collection.updateIndex(_self, updateOpts)
}
if (current) {
if (inverseDef.type === hasOneType) {
utils.set(current, inverseDef.localField, undefined)
} else if (inverseDef.type === hasManyType) {
const children = utils.get(current, inverseDef.localField)
utils.remove(children, function (_record) {
return id === utils.get(_record, idAttribute)
})
}
}
return record
}
}
if (mapper.recordClass.prototype.hasOwnProperty(foreignKey)) {
const superClass = mapper.recordClass
mapper.recordClass = superClass.extend({
constructor: (function () {
var subClass = function Record (props, opts) {
utils.classCallCheck(this, subClass)
superClass.call(this, props, opts)
}
return subClass
})()
})
}
Object.defineProperty(mapper.recordClass.prototype, foreignKey, {
enumerable: true,
get () { return this._get(foreignKey) },
set (value) {
const _self = this
if (utils.isUndefined(value)) {
// Unset locals
utils.set(_self, localField, undefined)
} else {
safeSet(_self, foreignKey, value)
let storeRecord = self.get(relation, value)
if (storeRecord) {
utils.set(_self, localField, storeRecord)
}
}
}
})
} else if (type === hasManyType) {
const localKeys = def.localKeys
const foreignKeys = def.foreignKeys
// TODO: Handle case when belongsTo relation isn't ever defined
if (self._collections[relation] && foreignKey && !self.getCollection(relation).indexes[foreignKey]) {
self.getCollection(relation).createIndex(foreignKey)
}
descriptor = {
get () {
const _self = this
let current = getter.call(_self)
if (!current) {
_self._set(path, [])
}
return getter.call(_self)
},
set (records) {
const _self = this
records || (records = [])
if (records && !utils.isArray(records)) {
records = [records]
}
const id = utils.get(_self, idAttribute)
const relatedIdAttribute = def.getRelation().idAttribute
const inverseDef = def.getInverse(mapper)
const inverseLocalField = inverseDef.localField
let linked = _self._get(path)
if (!linked) {
linked = []
}
const current = linked
linked = []
const toLink = {}
records.forEach(function (record) {
const relatedId = utils.get(record, relatedIdAttribute)
if (!utils.isUndefined(relatedId)) {
// Prefer store record
record = self.get(relation, relatedId) || record
toLink[relatedId] = record
}
linked.push(record)
})
if (foreignKey) {
records.forEach(function (record) {
// Update (set) inverse relation
safeSet(record, foreignKey, id)
self.getCollection(relation).updateIndex(record, updateOpts)
utils.set(record, inverseLocalField, _self)
})
current.forEach(function (record) {
const relatedId = utils.get(record, relatedIdAttribute)
if (!utils.isUndefined(relatedId) && !toLink.hasOwnProperty(relatedId)) {
// Update (unset) inverse relation
safeSet(record, foreignKey, undefined)
self.getCollection(relation).updateIndex(record, updateOpts)
utils.set(record, inverseLocalField, undefined)
}
})
} else if (localKeys) {
const _localKeys = []
records.forEach(function (record) {
// Update (set) inverse relation
utils.set(record, inverseLocalField, _self)
_localKeys.push(utils.get(record, relatedIdAttribute))
})
// Update locals
utils.set(_self, localKeys, _localKeys)
// Update (unset) inverse relation
current.forEach(function (record) {
const relatedId = utils.get(record, relatedIdAttribute)
if (!utils.isUndefined(relatedId) && !toLink.hasOwnProperty(relatedId)) {
// Update inverse relation
utils.set(record, inverseLocalField, undefined)
}
})
} else if (foreignKeys) {
// Update (unset) inverse relation
current.forEach(function (record) {
const _localKeys = utils.get(record, foreignKeys) || []
utils.remove(_localKeys, function (_key) {
return id === _key
})
const _localField = utils.get(record, inverseLocalField) || []
utils.remove(_localField, function (_record) {
return id === utils.get(_record, idAttribute)
})
})
// Update (set) inverse relation
records.forEach(function (record) {
const _localKeys = utils.get(record, foreignKeys) || []
utils.noDupeAdd(_localKeys, id, function (_key) {
return id === _key
})
const _localField = utils.get(record, inverseLocalField) || []
utils.noDupeAdd(_localField, _self, function (_record) {
return id === utils.get(_record, idAttribute)
})
})
}
_self._set(path, linked)
return linked
}
}
} else if (type === hasOneType) {
// TODO: Handle case when belongsTo relation isn't ever defined
if (self._collections[relation] && foreignKey && !self.getCollection(relation).indexes[foreignKey]) {
self.getCollection(relation).createIndex(foreignKey)
}
descriptor = {
get: getter,
set (record) {
const _self = this
const current = this._get(path)
if (record === current) {
return current
}
const relatedId = utils.get(record, def.getRelation().idAttribute)
const inverseLocalField = def.getInverse(mapper).localField
// Update (unset) inverse relation
if (current) {
safeSet(current, foreignKey, undefined)
self.getCollection(relation).updateIndex(current, updateOpts)
utils.set(current, inverseLocalField, undefined)
}
if (record) {
// Prefer store record
if (!utils.isUndefined(relatedId)) {
record = self.get(relation, relatedId) || record
}
// Set locals
_self._set(path, record)
// Update (set) inverse relation
safeSet(record, foreignKey, utils.get(_self, idAttribute))
self.getCollection(relation).updateIndex(record, updateOpts)
utils.set(record, inverseLocalField, _self)
} else {
// Set locals
_self._set(path, undefined)
}
return record
}
}
}
if (descriptor) {
descriptor.enumerable = utils.isUndefined(def.enumerable) ? false : def.enumerable
if (def.get) {
let origGet = descriptor.get
descriptor.get = function () {
return def.get(def, this, (...args) => origGet.apply(this, args))
}
}
if (def.set) {
let origSet = descriptor.set
descriptor.set = function (related) {
return def.set(def, this, related, (value) => origSet.call(this, value === undefined ? related : value))
}
}
Object.defineProperty(mapper.recordClass.prototype, localField, descriptor)
}
})
return mapper
},
/**
* TODO
*
* @name DataStore#destroy
* @method
* @param {string} name - Name of the {@link Mapper} to target.
* @param {(string|number)} id - Passed to {@link Mapper#destroy}.
* @param {Object} [opts] - Passed to {@link Mapper#destroy}. See
* {@link Mapper#destroy} for more configuration options.
* @returns {Promise}
*/
destroy (name, id, opts) {
opts || (opts = {})
return this._callSuper('destroy', name, id, opts).then((result) => {
if (opts.raw) {
result.data = this.getCollection(name).remove(id, opts)
} else {
result = this.getCollection(name).remove(id, opts)
}
delete this._pendingQueries[name][id]
delete this._completedQueries[name][id]
return result
})
},
/**
* TODO
*
* @name DataStore#destroyAll
* @method
* @param {string} name - Name of the {@link Mapper} to target.
* @param {Object} [query] - Passed to {@link Mapper#destroyAll}.
* @param {Object} [opts] - Passed to {@link Mapper#destroyAll}. See
* {@link Mapper#destroyAll} for more configuration options.
* @returns {Promise}
*/
destroyAll (name, query, opts) {
opts || (opts = {})
return this._callSuper('destroyAll', name, query, opts).then((result) => {
if (opts.raw) {
result.data = this.getCollection(name).removeAll(query, opts)
} else {
result = this.getCollection(name).removeAll(query, opts)
}
const hash = this.hashQuery(name, query, opts)
delete this._pendingQueries[name][hash]
delete this._completedQueries[name][hash]
return result
})
},
eject (name, id, opts) {
console.warn('DEPRECATED: "eject" is deprecated, use "remove" instead')
return this.remove(name, id, opts)
},
ejectAll (name, query, opts) {
console.warn('DEPRECATED: "ejectAll" is deprecated, use "removeAll" instead')
return this.removeAll(name, query, opts)
},
/**
* TODO
*
* @name DataStore#find
* @method
* @param {string} name - Name of the {@link Mapper} to target.
* @param {(string|number)} id - Passed to {@link Mapper#find}.
* @param {Object} [opts] - Passed to {@link Mapper#find}.
* @returns {Promise}
*/
find (name, id, opts) {
opts || (opts = {})
const pendingQuery = this._pendingQueries[name][id]
utils.fillIn(opts, this.getMapper(name))
if (pendingQuery) {
return pendingQuery
}
const item = this.cachedFind(name, id, opts)
let promise
if (opts.force || !item) {
promise = this._pendingQueries[name][id] = this._callSuper('find', name, id, opts).then((result) => {
delete this._pendingQueries[name][id]
result = this._end(name, result, opts)
this.cacheFind(name, result, id, opts)
return result
}, (err) => {
delete this._pendingQueries[name][id]
return utils.reject(err)
})
} else {
promise = utils.resolve(item)
}
return promise
},
/**
* TODO
*
* @name DataStore#findAll
* @method
* @param {string} name - Name of the {@link Mapper} to target.
* @param {Object} [query] - Passed to {@link Model.findAll}.
* @param {Object} [opts] - Passed to {@link Model.findAll}.
* @returns {Promise}
*/
findAll (name, query, opts) {
opts || (opts = {})
const hash = this.hashQuery(name, query, opts)
const pendingQuery = this._pendingQueries[name][hash]
utils.fillIn(opts, this.getMapper(name))
if (pendingQuery) {
return pendingQuery
}
const items = this.cachedFindAll(name, hash, opts)
let promise
if (opts.force || !items) {
promise = this._pendingQueries[name][hash] = this._callSuper('findAll', name, query, opts).then((result) => {
delete this._pendingQueries[name][hash]
result = this._end(name, result, opts)
this.cacheFindAll(name, result, hash, opts)
return result
}, (err) => {
delete this._pendingQueries[name][hash]
return utils.reject(err)
})
} else {
promise = utils.resolve(items)
}
return promise
},
/**
* TODO
*
* @name DataStore#getCollection
* @method
* @param {string} name Name of the {@link LinkedCollection} to retrieve.
* @returns {LinkedCollection}
*/
getCollection (name) {
const collection = this._collections[name]
if (!collection) {
throw utils.err(`${DOMAIN}#getCollection`, name)(404, 'collection')
}
return collection
},
hashQuery (name, query, opts) {
return utils.toJson(query)
},
inject (name, records, opts) {
console.warn('DEPRECATED: "inject" is deprecated, use "add" instead')
return this.add(name, records, opts)
},
remove (name, id, opts) {
const record = this.getCollection(name).remove(id, opts)
if (record) {
this.removeRelated(name, [record], opts)
}
return record
},
removeAll (name, query, opts) {
const records = this.getCollection(name).removeAll(query, opts)
if (records.length) {
this.removeRelated(name, records, opts)
}
return records
},
removeRelated (name, records, opts) {
utils.forEachRelation(this.getMapper(name), opts, (def, optsCopy) => {
records.forEach((record) => {
let relatedData
let query
if (def.foreignKey && (def.type === hasOneType || def.type === hasManyType)) {
query = { [def.foreignKey]: def.getForeignKey(record) }
} else if (def.type === hasManyType && def.localKeys) {
query = {
where: {
[def.getRelation().idAttribute]: {
'in': utils.get(record, def.localKeys)
}
}
}
} else if (def.type === hasManyType && def.foreignKeys) {
query = {
where: {
[def.foreignKeys]: {
'contains': def.getForeignKey(record)
}
}
}
} else if (def.type === belongsToType) {
relatedData = this.remove(def.relation, def.getForeignKey(record), optsCopy)
}
if (query) {
relatedData = this.removeAll(def.relation, query, optsCopy)
}
if (relatedData) {
if (utils.isArray(relatedData) && !relatedData.length) {
return
}
if (def.type === hasOneType) {
relatedData = relatedData[0]
}
def.setLocalField(record, relatedData)
}
})
})
},
/**
* TODO
*
* @name DataStore#update
* @method
* @param {string} name - Name of the {@link Mapper} to target.
* @param {(string|number)} id - Passed to {@link Mapper#update}.
* @param {Object} record - Passed to {@link Mapper#update}.
* @param {Object} [opts] - Passed to {@link Mapper#update}. See
* {@link Mapper#update} for more configuration options.
* @returns {Promise}
*/
update (name, id, record, opts) {
opts || (opts = {})
return this._callSuper('update', name, id, record, opts)
.then((result) => this._end(name, result, opts))
},
/**
* TODO
*
* @name DataStore#updateAll
* @method
* @param {string} name - Name of the {@link Mapper} to target.
* @param {Object} props - Passed to {@link Mapper#updateAll}.
* @param {Object} [query] - Passed to {@link Mapper#updateAll}.
* @param {Object} [opts] - Passed to {@link Mapper#updateAll}. See
* {@link Mapper#updateAll} for more configuration options.
* @returns {Promise}
*/
updateAll (name, props, query, opts) {
opts || (opts = {})
return this._callSuper('updateAll', name, query, props, opts)
.then((result) => this._end(name, result, opts))
},
/**
* TODO
*
* @name DataStore#updateMany
* @method
* @param {string} name Name of the {@link Mapper} to target.
* @param {(Object[]|Record[])} records Passed to {@link Mapper#updateMany}.
* @param {Object} [opts] Passed to {@link Mapper#updateMany}. See
* {@link Mapper#updateMany} for more configuration options.
* @returns {Promise}
*/
updateMany (name, records, opts) {
opts || (opts = {})
return this._callSuper('updateMany', name, records, opts)
.then((result) => this._end(name, result, opts))
}
}
proxiedCollectionMethods.forEach(function (method) {
props[method] = function (name, ...args) {
return this.getCollection(name)[method](...args)
}
})
/**
* The `DataStore` class is an extension of {@link Container}. Not only does
* `DataStore` manage mappers, but also collections. `DataStore` implements the
* asynchronous {@link Mapper} methods, such as {@link Mapper#find} and
* {@link Mapper#create}. If you use the asynchronous `DataStore` methods
* instead of calling them directly on the mappers, then the results of the
* method calls will be inserted into the store's collections. You can think of
* a `DataStore` as an [Identity Map](https://en.wikipedia.org/wiki/Identity_map_pattern)
* for the [ORM](https://en.wikipedia.org/wiki/Object-relational_mapping)
* (the Mappers).
*
* ```javascript
* import {DataStore} from 'js-data'
* ```
*
* @example
* import {DataStore} from 'js-data'
* import HttpAdapter from 'js-data-http'
* const store = new DataStore()
*
* // DataStore#defineMapper returns a direct reference to the newly created
* // Mapper.
* const UserMapper = store.defineMapper('user')
*
* // DataStore#as returns the store scoped to a particular Mapper.
* const UserStore = store.as('user')
*
* // Call "find" on "UserMapper" (Stateless ORM)
* UserMapper.find(1).then((user) => {
* // retrieved a "user" record via the http adapter, but that's it
*
* // Call "find" on "store" targeting "user" (Stateful DataStore)
* return store.find('user', 1) // same as "UserStore.find(1)"
* }).then((user) => {
* // not only was a "user" record retrieved, but it was added to the
* // store's "user" collection
* const cachedUser = store.getCollection('user').get(1)
* console.log(user === cachedUser) // true
* })
*
* @class DataStore
* @extends Container
* @param {Object} [opts] Configuration options. See {@link Container}.
* @returns {DataStore}
* @see Container
* @since 3.0.0
* @tutorial ["http://www.js-data.io/v3.0/docs/components-of-jsdata#datastore","Components of JSData: DataStore"]
* @tutorial ["http://www.js-data.io/v3.0/docs/working-with-the-datastore","Working with the DataStore"]
* @tutorial ["http://www.js-data.io/v3.0/docs/jsdata-and-the-browser","Notes on using JSData in the Browser"]
*/
export default Container.extend(props)
/**
* Create a subclass of this DataStore.
*
* @example <caption>Extend the class in a cross-browser manner.</caption>
* import {DataStore} from 'js-data'
* const CustomDataStoreClass = DataStore.extend({
* foo () { return 'bar' }
* })
* const customDataStore = new CustomDataStoreClass()
* console.log(customDataStore.foo()) // "bar"
*
* @example <caption>Extend the class using ES2015 class syntax.</caption>
* class CustomDataStoreClass extends DataStore {
* foo () { return 'bar' }
* }
* const customDataStore = new CustomDataStoreClass()
* console.log(customDataStore.foo()) // "bar"
*
* @method DataStore.extend
* @param {Object} [props={}] Properties to add to the prototype of the
* subclass.
* @param {Object} [classProps={}] Static properties to add to the subclass.
* @returns {Constructor} Subclass of this DataStore.
* @since 3.0.0
*/
js-data