[netcat-na-diary]

Промисы с if

	fetchData = date => {
		this.setState({ isLoading: true });
		let _date = date ? date : moment().format('YYYY-MM-DD HH:mm');
		let states = {
			isLoading: false,
			date: _date,
			message: '',
			data: [],
			events: [],
			latestFetchedDate: _date,
			topHeaderPosition: 0,
			leftHeaderPosition: 0,
			valuesById: {}
		};

		helper.loadDataByUrl(api.events.getActive + _date)
			.then(response => {
					if (response.length) {
						states.events = response;

						helper.loadDataByUrl(api.report.dailyWorkSheet2.create(_date))
							.then((response) => {
								//TODO: здесь разобрать данные по заголовкам и ячейкам

								if (response.status == -1) {
									states.message = response.message;
								} else {
									let _data = response.data;

									states.data = _data;
									states.topHeaderPosition = -1;
									states.leftHeaderPosition = -1;
									states.valuesById = this.getValuesById(_data);
								}
								this.setState({ ...states });
							});
					} else {
						this.setState({ ...states });
					}
				})
	}

Промисы со вложенными then

	fetchData = date => {
		this.setState({ isLoading: true });
		let _date = date ? date : moment().format('YYYY-MM-DD HH:mm');
		let states = {
			isLoading: false,
			date: _date,
			message: '',
			data: [],
			events: [],
			latestFetchedDate: _date,
			topHeaderPosition: 0,
			leftHeaderPosition: 0,
			valuesById: {}
		};
		
		helper.loadDataByUrl(api.events.getActive + _date)
			.then(response => {
				if (response.length) {
					states.events = response;
					return helper.loadDataByUrl(api.report.dailyWorkSheet2.create(_date))
				}

				return null;
			})
			.then(response => {
				if (response === null) return;

				if (response.status == -1) {
					states.message = response.message;
				} else {
					let _data = response.data;

					states.data = _data;
					states.topHeaderPosition = -1;
					states.leftHeaderPosition = -1;
					states.valuesById = this.getValuesById(_data);
				}
				
			})
			.then(() => {
				this.setState({ ...states });
			})
	}