Django 模型多字段保存

Question

我正在尝试在我的订单模型中创建一个对象。我的 js return 模型数据库的多个值列表但是我无法将从 ajax 收到的多个值保存为列表。我看到它是 js 中的数组和 django 中的列表，但它没有发生。我已经为我的订单模型模型字段尝试使用 ManyToManyField 而不是 ForeignKey，但这也不起作用。

有什么方法可以保存多个值（列表），这些值（列表）在我的其他模型中已经是对象了吗？

models.py

from django.db import models

class Car(models.Model):
    name = models.CharField(max_length=80)
    country = models.CharField(max_length=100)

    def __str__(self):
        return str(self.name)

class Model(models.Model):
    name = models.CharField(max_length=50)
    car = models.ForeignKey(Car, on_delete=models.CASCADE)

    def __str__(self):
        return f"{self.car}-{self.name}"

class Order(models.Model):
    car = models.ForeignKey(Car, on_delete=models.CASCADE)
    model = models.ForeignKey(Model, on_delete=models.CASCADE)

    def __str__(self):
        return str(self.pk)

views.py

def create_order(request):
    if request.method == 'POST': 
        print("***", request.POST)
        my_car_id = request.POST.get('car')         
        my_model_id = request.POST.getlist('model[]') 
        print("***", my_car_id, my_model_id)
        print("***", type(my_car_id), type(my_model_id))
        car_obj = models.Car.objects.get(id=my_car_id) 
        model_obj = models.Model.objects.get(id=my_model_id) 
        print("obj", car_obj, model_obj)
        models.Order.objects.create(car=car_obj, model=model_obj) 
        return JsonResponse({'created':True}) 
    return JsonResponse({'created':False})

html

<form id="car-form">
    {% csrf_token %}
    <div class="row">
        <div class="col">
            <label for="cars-data-box">Choose a car</label>
            <select style="width: 15rem;" class="form-control" id="cars-data-box">
                <option value="---">---</option>
            </select>
        </div>
        <div class="col">
            <label for="models-data-box">Choose a model</label>
            <select multiple style="width: 15rem;" class="form-control" id="models-data-box">
                <option value="---">---</option>
            </select>
        </div>
        <input type="hidden" name="car">
    </div>
    <div id="button-box" class="row pt-2">
        <div class="col">
            <button id="submit-form" type="submit" class="btn btn-secondary">Save</button>
        </div>
    </div>
</form>

js

console.log('main.js working')
var carBox = document.getElementById("cars-data-box")
var modelBox = document.getElementById("models-data-box")
var btn = document.getElementById("submit-form")
var csrf = document.getElementsByName('csrfmiddlewaretoken')
var carForm = document.getElementById('car-form')
var alertBox = document.getElementById('alert-box')

$.ajax({
    type: 'GET', 
    url: '/cars-json/', 
    success: function(response){ 
        var allCars = response.cars
        console.log("all cars:", allCars)
        for(var i=0; i< allCars.length; i++){
            var carObj = allCars[i];
            var carOpt = document.createElement('option');
            carOpt.value = carObj.id;
            carOpt.innerHTML = carObj.name;
            carBox.appendChild(carOpt);
        }        
    },
    error: function(error){ 
        console.log(error) 
    }
})

$(document).ready(function(){
    $(carBox).on('change', function(){ 
        var selectedCar = $(this).val(); 
        console.log("selectedCar", selectedCar);
        $(modelBox).empty(); 
        $.ajax({
            type:'GET',
            url:'/models-json/',
            success:function(response){
                var allModels = response.models
                console.log("allModels", allModels)
                possibleModels = allModels.filter( merhaba => merhaba.car_id == selectedCar ); 
                console.log("possibleModels", possibleModels);
                for(var i=0; i<possibleModels.length; i++){ 
                    var modelObj =  possibleModels[i]; 
                    var modelOpt = document.createElement('option'); 
                    modelOpt.value = modelObj.id; 
                    modelOpt.innerHTML =  modelObj.name; 
                    modelBox.appendChild(modelOpt); 
                }
            }
        })
    })
})

carForm.addEventListener('submit', e=>{ 
    e.preventDefault() 
    console.log('submitted', carBox.value, modelBox.value)
    // var selected_models = []
    // for(var i of document.getElementById('models-data-box').options){
    //     if(i.selected_models){
    //         selected_models.push(i.value)
    //     }
    // }
    var selected_models = $(modelBox).val()
    console.log("selected_models", selected_models)
    $.ajax({ 
        type:'POST',  
        url:'/create/',         
        data:{ 
            'csrfmiddlewaretoken':csrf[0].value, 
            'car':carBox.value, 
            'model':selected_models, 
        },
        success:function(response){ 
            console.log(response)
        },
        error:function(error){
            console.log(error)
        }
    })
})

Answer 1

你需要bulk_create这样的：

def create_order(request):
   if request.method == 'POST':
      # rest of the code    
      model_objs = models.Model.objects.filter(id__in=my_model_id) 
      models.Order.objects.bulk_create(
         [models.Order(car=car_obj, model=model_obj) for model_obj in model_objs]
      )

Django 模型多字段保存

Django Models Multiple Field Saving

python

django

model

multiple-select