Model using ES6

var required_fields = ['place','start_date','end_date','description'];

var message_errors = {
	place : 'Place is required',
	start_date : 'start_date required',
	end_date : 'end_date is required',
	description : 'description is required',
	invalid_dates : 'Start date has to be less than end date'
};

var errors = [];

class Event{

	constructor(new_event){
		//Default values
		this.attributes = {
			id : null,
			place : null,
			description : null,
			guests : [],
			start_date : null,
			end_date : null
		}

		//If we are loading data on create instance object 

		if(new_event){
			this.attributes = {
				id : new_event.id? new_event.id : null,
				place : new_event.place? new_event.place : null,
				description : new_event.description? new_event.description : null,
				guests : new_event.guests? new_event.guests : [],
				start_date : new_event.start_date? new_event.start_date : null,
				end_date : new_event.end_date? new_event.end_date : null
			}
		}
	}


	//Validators

	validForCreation(){
		var model = this.attributes;
		errors = []; //Remove message errors
		for(var f = 0; f < required_fields.length ;f++){
			var value = required_fields[f]; // Required field

			var form_attr = this.attributes[value]  //Model property
			if(!(form_attr)){
				errors.push(message_errors[value]);
			}

		}

		//If you want to validate end_date > to start_date validation

		model.start_date > model.end_date ? errors.push(message_errors['invalid_dates']) : model.start_date;

		return errors.length === 0? true : false;
	}

	showErrors(){
		return errors;
	}

	//Create setters and getters

	set id(id){
		this.attributes.id = id;
	}

	get id(){
		return this.attributes.id;
	}

	set place(place){
		this.attributes.place = place;
	}

	get place(){
		return this.attributes.place;
	}

	set description(description){
		this.attributes.description = description;
	}

	get description(){
		return this.attributes.description;
	}

	set guests(guests){
		this.attributes.guests = guests;
	}

	get guests(){
		return this.attributes.guests;
	}

	set start_date(start_date){
		this.attributes.start_date = start_date;
	}

	get start_date(){
		return this.attributes.start_date;
	}

	set end_date(end_date){
		this.attributes.end_date = end_date;
	}

	get end_date(){
		return this.attributes.end_date;
	}

}


export 
default Event