graphql-chat/models.js

const ObjectID    = require("mongodb").ObjectID;
const {connect}   = require('mm')

module.exports = async (dbName='graphql-chat') => {
    const {Savable, slice} = await connect(dbName)

    async function getModels({id, acl}){
        const SlicedSavable = slice(id === 'anon' ? [id] : [...acl])

        class User extends SlicedSavable {
            constructor(...params){
                super(...params)

                this.originalACL = this.acl && [...this.acl]
            }

            async save(...params){
                console.log(this)
                let otherUserWithThisLogin = this.login && await Savable.m.User.findOne({login: this.login})
                if (this._id){
                    if (otherUserWithThisLogin && otherUserWithThisLogin._id.toString() !== this._id.toString()){
                        throw new ReferenceError(`User ${this.login} already exists`)
                    }
                    if (!acl.includes('admin') && this.originalACL.toString() !== this.acl.toString())
                        throw new ReferenceError(`Not enough permissions for changing acl on ${this.login}`)
                    else return await super.save(...params)
                }
                else {
                    if (otherUserWithThisLogin){
                        throw new ReferenceError(`User ${this.login} already exists`)
                    }
                    await super.save(...params)
                    this.___owner = this._id.toString()
                    this.acl      = [this.___owner, "user"]
                    return await Savable.prototype.save.call(this, ...params)
                }
            }

            static get relations(){ //don't needed due to ___owner in most cases
                return {
                    avatar : "userAvatar",
                    chats: ["members"]
                }
            }

            static get defaultPermissions(){
                return {
                    create: ['anon'],
                    read: ['owner', 'user', 'admin'],
                    write: ['owner', 'admin'],
                    delete: []
                }
            }
        }
        SlicedSavable.addClass(User)

        class OwnerSlicedSavable extends SlicedSavable {
            get owner(){
                if (!this.___owner) return this.___owner

                return SlicedSavable.m.User.findOne({_id: ObjectID(this.___owner)})
            }
        }


        class Media extends OwnerSlicedSavable {
            constructor(...params){
                super(...params)
            }


            static async fromFileData(fileData){
                let media  = new Media({})
                media.fileData = fileData
                media.url      = `images/${fileData.filename}`
                media.originalFileName = fileData.originalname
                media.type             = fileData.mimetype
                await media.save()
                return media;
            }

            //async save(...params){
                //if (this.userAvatar){
                    //if (this.userAvatar._id.toString() !== id){
                        //throw new ReferenceError(`You can't set ava for other user`)
                    //}
                //}

                //return await super.save(...params)
            //}

            static get relations(){
                return {
                    userAvatar: "avatar", //if it is ava
                    chatAvatars: "avatar",
                    messages: ["media"]
                }
            }

            static get defaultPermissions(){
                return {
                    create: ['user', 'admin'],
                    read: ['anon', 'user', 'admin'],
                    write: ["owner", 'admin'],
                    delete: ['admin']
                }
            }

        }
        SlicedSavable.addClass(Media)

        class Message extends OwnerSlicedSavable {
            static get relations(){
                return {
                    media: ['messages'],
                    replyTo: ['replies'],
                    replies: 'replyTo',
                    forwardWith: 'forwarded',
                    forwarded: ['forwardWith'],
                    chat: ['messages']
                }
            }

            static get defaultPermissions(){
                return {
                    create: ['user'],
                    read: ['owner', 'user', 'admin'],
                    write: ['owner','admin'],
                    delete: ['admin']
                }
            }

            static get guestRelations(){
                return ['replies']
                return ['forwardWith']
            }
        }
        SlicedSavable.addClass(Message)

        class Chat extends OwnerSlicedSavable {
            constructor(...params){
                super(...params)
            }

            static get relations(){
                return {
                    members: ['chats'],
                    messages: 'chat',
                    avatar: ["chatAvatars"]
                }
            }

            static get defaultPermissions(){
                return {
                    create: ['user'],
                    read: ['owner',  'admin'],
                    write: ['owner'],
                    delete: []
                }
            }
        }
        SlicedSavable.addClass(TimeTrack)

        const thisUser = id !== 'anon' && await Savable.m.User.findOne({_id: ObjectID(id)})



        return {models: {
                            SlicedSavable, ...SlicedSavable.classes
                        }, 
                thisUser}
    }

    return {
        Savable, 
        slice,
        getModels
    }
}