smartdata/ts/smartdata.classes.dbcollection.ts

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import * as plugins from './smartdata.plugins'
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import { Db } from './smartdata.classes.db'
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export interface IFindOptions {
limit?: number
}
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export interface IDocValidation<T> {
(doc: T): boolean
}
export function Collection(db: Db) {
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return function (constructor) {
constructor['dbCollection'] = new DbCollection(constructor.name, db)
}
}
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export class DbCollection<T> {
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/**
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* the collection that is used, defaults to mongodb collection,
* can be nedb datastore (sub api of mongodb)
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*/
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collection: plugins.mongodb.Collection
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name: string
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db: Db
objectValidation: IDocValidation<T> = null
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constructor(nameArg: string, dbArg: Db) {
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this.name = nameArg
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this.db = dbArg
if (this.db.dbType === 'mongodb') {
this.collection = dbArg.db.collection(nameArg)
} else {
this.collection = new plugins.nedb()
}
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}
/**
* adds a validation function that all newly inserted and updated objects have to pass
*/
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addDocValidation(funcArg: IDocValidation<T>) {
this.objectValidation = funcArg
}
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/**
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* finds an object in the DbCollection
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*/
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find(docMatchArg: T | any, optionsArg?: IFindOptions): plugins.q.Promise<T[]> {
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let done = plugins.q.defer<T[]>()
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if (this.db.dbType === 'mongodb') {
let findCursor = this.collection.find(docMatchArg)
if (optionsArg) {
if (optionsArg.limit) { findCursor = findCursor.limit(1) }
}
findCursor.toArray((err, docs) => {
if (err) {
done.reject(err)
throw err
}
done.resolve(docs)
})
} else if (this.db.dbType === 'nedb') {
this.collection.find(docMatchArg, (err, docs) => {
if (err) {
done.reject(err)
throw err
}
done.resolve(docs)
})
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}
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return done.promise
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}
/**
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* inserts object into the DbCollection
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*/
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insertOne(docArg: T): plugins.q.Promise<void> {
let done = plugins.q.defer<void>()
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this.checkDoc(docArg).then(
() => {
if (this.db.dbType === 'mongodb') {
this.collection.insertOne(docArg)
.then(() => { done.resolve() })
} else if (this.db.dbType === 'nedb') {
this.collection.insert(docArg, (err, newDoc) => {
if (err) {
done.reject(err)
throw err
}
done.resolve()
})
}
},
() => {
done.reject(new Error('one the docs did not pass validation'))
})
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return done.promise
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}
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/**
* inserts many objects at once into the DbCollection
*/
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insertMany(docArrayArg: T[]): plugins.q.Promise<void> {
let done = plugins.q.defer<void>()
let checkDocPromiseArray: plugins.q.Promise<void>[] = []
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for (let docArg of docArrayArg) {
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checkDocPromiseArray.push(this.checkDoc(docArg))
}
plugins.q.all(checkDocPromiseArray).then(() => {
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if (this.db.dbType === 'mongodb') {
this.collection.insertMany(docArrayArg)
.then(() => { done.resolve() })
} else if (this.db.dbType === 'nedb') {
let paramArray = plugins.lodash.concat<any>(docArrayArg, (err, newDoc) => {
if (err) {
done.reject(err)
throw err
}
done.resolve()
})
this.collection.insert.apply(null, paramArray)
}
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})
return done.promise
}
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/**
* checks a Doc for constraints
*/
private checkDoc(docArg: T): plugins.q.Promise<void> {
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let done = plugins.q.defer<void>()
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let validationResult = true
if (this.objectValidation) {
validationResult = this.objectValidation(docArg)
}
if (validationResult) {
done.resolve()
} else {
done.reject('validation of object did not pass')
}
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return done.promise
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}
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}