memory-orm/lib/list.js

client side ORM + map reduce

'use strict'
Object.defineProperty(exports, '__esModule', { value: true })
exports.List = void 0
const tslib_1 = require('tslib')
const at_1 = tslib_1.__importDefault(require('lodash/at'))
const uniq_1 = tslib_1.__importDefault(require('lodash/uniq'))
const orderBy_1 = tslib_1.__importDefault(require('lodash/orderBy'))
const groupBy_1 = tslib_1.__importDefault(require('lodash/groupBy'))
const property_1 = tslib_1.__importDefault(require('lodash/property'))
class List extends Array {
  constructor(query) {
    super()
    if (query && query.where && query.in) {
      this.query = query
    }
  }
  get first() {
    return this[0]
  }
  get last() {
    return this[this.length - 1]
  }
  get head() {
    return this[0]
  }
  get tail() {
    return this[this.length - 1]
  }
  get uniq() {
    return this.constructor.bless(uniq_1.default(this), this.query)
  }
  pluck(...keys) {
    let cb
    switch (keys.length) {
      case 0:
        cb = function () {
          return null
        }
        break
      case 1:
        cb = property_1.default(keys[0])
        break
      default:
        cb = function (o) {
          return at_1.default(o, ...keys)
        }
        break
    }
    return this.constructor.bless(this.map(cb), this.query)
  }
  static bless(list, query) {
    Reflect.setPrototypeOf(list, this.prototype)
    if (query && query.where && query.in) {
      list.query = query
    }
    return list
  }
  sort(...cmd) {
    const o = orderBy_1.default(this, cmd[0], cmd[1])
    Reflect.setPrototypeOf(o, Reflect.getPrototypeOf(this))
    return o
  }
  group_by(cb) {
    const o = groupBy_1.default(this, cb)
    for (const key in o) {
      const oo = o[key]
      Reflect.setPrototypeOf(oo, Reflect.getPrototypeOf(this))
    }
    return o
  }
  page_by(per) {
    let idx = 0
    return Object.values(
      this.group_by(function (o) {
        return Math.floor(idx++ / per)
      })
    )
  }
  where(req) {
    return this.query.where(req)
  }
  in(req) {
    return this.query.in(req)
  }
}
exports.List = List
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