mm-graphql-admin/src/front-models.js

export default async function createModels2(gql, config={create: 'Upsert', update: 'Upsert', delete: "Delete",  findOne: "FindOne", find: 'Find', count: 'Count'}){
    const universeQuery = `query universe{
  __schema{
     types {
        name,
        kind,
        inputFields{
          name,
         type {
            kind,
            ofType{
              name,
                fields{
                  name,
                  type{
                    name,
                    kind
                  }
                }
            }
            name,
            fields{
              name,
              type{
                name,
                kind
              }
            }
          }
          
                
        }
        fields {
          name,
         type {
            kind,
            ofType{
              name,
                fields{
                  name,
                  type{
                    name,
                    kind
                  }
                }
            }
            name,
            fields{
              name,
              type{
                name,
                kind
              }
            }
          }
          args{
            name,
            type{
              name,
                inputFields{
                    name,
                        type{
                          name,
                          kind,
                          ofType{
                            name
                          }
                        }
                      }
                    }
                  }
                }
              }
  }}
  `

    const universe = await gql.request(universeQuery)
    console.log(universe)
    const types  = []
    const inputs = []
    for (let type of universe.__schema.types){
        if (!["Query", "Mutation"].includes(type.name) && type.kind === "OBJECT" && !type.name.startsWith('__')) types.push(type)
        if (!["Query", "Mutation"].includes(type.name) && type.kind === "INPUT_OBJECT" && !type.name.startsWith('__')) inputs.push(type)
    }
    console.log(types, inputs)

    let classes = {}

    const inTypes  = name => types.find(type => type.name === name)
    const inInputs = name => inputs.find(type => type.name === name)

    const projectionBuilder = (type, allFields=true) => {
        if (!allFields && type.fields[0].name !== '_id') allFields = true
        if (allFields)
            return '{' + 
                type.fields.map(field => { 
                    return field.name + ((field.type.kind === 'OBJECT' && (inTypes(field.type.name)) && projectionBuilder(inTypes(field.type.name), false)) ||
                    (field.type.kind === 'LIST'   && (inTypes(field.type.ofType.name)) && projectionBuilder(inTypes(field.type.ofType.name), false)) || '')
                })
                .join(',') 
                + '}'
        else return `{_id}`
    }

    const identityMap = {}


    const createClass = (name, type, input) => {
        if (!(name in classes)) {
            classes[name] = class {
                constructor(data={}, empty = false){
                    if (data._id && data._id in identityMap)
                        return identityMap[data._id]

                    this.populate(data)

                    this.empty = empty

                    if (this._id) identityMap[this._id] = this
                }

                populate(data){
                    type.fields.forEach(({name, type:{ ofType, kind, name:otherName}}) => {
                        ({SCALAR(){
                            if (data && typeof data === 'object' && name in data) this[name] = data[name]
                        },
                        LIST(){
                            const otherType = inTypes(ofType.name)
                            if (otherType  && data[name])
                                this[name] = data[name].map(otherEntity => new classes[otherType.name](otherEntity, otherEntity._id && Object.keys(otherEntity).length === 1))
                            else if (data && typeof data === 'object' && name in data) this[name] = data[name]
                        },
                        OBJECT(){
                            const otherType = inTypes(otherName)
                            if (otherType && data[name])
                                this[name] = new classes[otherType.name](data[name], data[name]._id && Object.keys(data[name]).length === 1)
                            else if (data && typeof data === 'object' && name in data) this[name] = data[name]
                        }})[kind].call(this)
                    })
                }

                get empty(){
                    return this.then
                }

                set empty(value){
                    if (value){
                        this.then = async (onFullfilled, onRejected) => {
                            const gqlQuery = `
                                query ${name}FindOne($query: String){
                                    ${name}FindOne(query: $query)
                                        ${projectionBuilder(type)}
                                    
                                }
                            `
                            const data = await gql.request(gqlQuery, {query: JSON.stringify([{_id: this._id}])})
                            this.populate(data[name + 'FindOne'])
                            this.empty = false
                            const thenResult = onFullfilled(this)
                            if (thenResult && typeof thenResult === 'object' && typeof thenResult.then === 'function'){
                                return await thenResult
                            }
                            return thenResult
                        }
                    }
                    else delete this.then
                }

                static get type(){
                    return type
                }

                static get input(){
                    return input
                }

                static get fields(){
                    return this.type.fields
                }

                async save(){
                    if (this.empty) throw new ReferenceError('Cannot save empty object')
                    const data = {}
                    input.inputFields.forEach(({name, type:{ ofType, kind, name:otherName}}) => {
                        ({SCALAR(){
                            if (this[name]) data[name] = this[name] 
                        },
                        LIST(){
                            const otherType = inInputs(ofType.name)
                            if (otherType  && this[name] && this[name] instanceof Array)
                                data[name] = this[name].map(otherEntity => (otherEntity._id ? {_id: otherEntity._id} : otherEntity))
                        },
                        INPUT_OBJECT(){
                            const otherType = inInputs(otherName)
                            if (otherType && this[name] && typeof this[name] === 'object')
                                data[name] = (this[name]._id ? {_id: this[name]._id} : this[name])
                        }})[kind].call(this)
                    })
                    const gqlQuery = `
                                mutation ${name}Upsert($data: ${input.name}){
                                    ${name}Upsert(${name.toLowerCase()}: $data)
                                        ${projectionBuilder(type)}
                                }
                    `
                    let result = await gql.request(gqlQuery, {data})
                    this.populate(result)
                }

                static async find(query={}, cursorCalls={}){
                    const gqlQuery = `
                        query ${name}Find($query: String){
                            ${name}Find(query: $query)
                                ${projectionBuilder(type)}
                        }
                    `
                    let result = await gql.request(gqlQuery, {query: JSON.stringify([query, cursorCalls])})
                    return result[name + 'Find'].map(entity => new classes[name](entity))
                }

                static async findOne(query){
                    const gqlQuery = `
                        query ${name}FindOne($query: String){
                            ${name}FindOne(query: $query)
                                ${projectionBuilder(type)}
                        }
                    `
                    let result = await gql.request(gqlQuery, {query: JSON.stringify([query])})
                    return result[name + 'FindOne']
                }

                static async count(query){
                    const gqlQuery = `
                        query ${name}Count($query: String){
                            ${name}Count(query: $query)
                        }
                    `
                    let result = await gql.request(gqlQuery, {query: JSON.stringify([query])})
                    return result[name + 'Count']
                }
            }
            Object.defineProperty(classes[name], 'name', {value: name})
        }
        return classes[name]
    }

    types.forEach((type) => createClass(type.name, type, inputs.find(input => input.name === `${type.name}Input`)))
    return classes;
}