django中ImageField的使用详解

# 图片储存根路径
MEDIA_ROOT = join('media')
# 图片访问url
MEDIA_URL = '/IMG/'

class Menu(models.Model):
  """
  餐品数据库
  """
  ID = models.BigAutoField(primary_key=True,editable=False)
  lastEditTime = models.DateTimeField(auto_now_add=True)
  merchantID = models.ForeignKey(Usr, verbose_name="商家账号", on_delete=models.CASCADE,to_field='ID')
  itemName = models.CharField(max_length=20,verbose_name="餐品名")
  itemText = models.TextField(verbose_name="餐品简介")
  price = models.FloatField(verbose_name="餐品价格")
  ################# up_load代表你上传图片所存储的文件夹名字
  picture = models.ImageField(verbose_name='餐品图片',null=True,upload_to='img/')
  class Meta:
    db_table = "Menu"
    verbose_name = "餐品数据表"
    ordering=['-lastEditTime']

class MerchantDish(forms.Form):
  """
  商家菜品提交表单
  """
  itemName = forms.CharField(max_length=20,label="餐品名")
  itemText = forms.CharField(max_length=300,label="餐品简介")
  price = forms.FloatField(label="餐品价格")
  picture = forms.ImageField(label='餐品图片')

<form action="updateDish_post/" method="post" enctype="multipart/form-data"> 
  {% csrf_token %} {{form.as_p}}
  <button type="submit">修改</button> 
  <button type="button"><a href="/MerchantSystem/DelDish/{{dishID}}/" rel="external nofollow" >删除</a></button>
</form>

{% for dish in menu %}
<!--将目录的数据展示在html中-->
<!-- 提交到一个含参数的url注意后端的接收 -->
<form action="/MerchantSystem/Dish/{{dish.ID}}/" method="post">
  {% csrf_token %}
  <li class="media">
    <div class="media-left media-middle" >
        <img class="media-object" width="150" height="150" src="/IMG/{{dish.picture}}" alt="">
    </div>
    <div class="media-body">
      <h4 class="media-heading">
        <button type='submit' class=" url" title="更新菜品信息">
        菜名：{{dish.itemName|default:"Null"}}
        </button>
        <span class="label label-default">
          价格：{{dish.price|default:"Null"}}
        </span>

      </h4>
      简介：{{dish.itemText|default:"Null"}}
    </div>
  </li>
</form>

{% empty %}

<!--若中无数据展示如下内容-->

<p>暂无数据..</p>

{% endfor %} {% endblock tableBody %}

from django.conf import settings
from django.conf.urls.static import static
urlpatterns = [
  path('', views.base_view, name = "base"),# 顾客服务系统
  path('order/<int:dishID>/', views.order_view),# 订单详情
  path('order/<int:dishID>/submit/',views.order_submit),# 提交订单
  path('pay/<int:orderID>/', views.pay_view),# 缴费
  path('pay/<int:orderID>/submit/',views.pay_submit),#确认账单
  path('order/list/',views.order_list_view),#历史订单列表
  path('order/confirm/<int:orderID>/',views.order_confirm),#订单确认收到
  path('order/comment/<int:orderID>/',views.comment),#到达相应菜品的评论界面
  path('order/comment_post/<int:orderID>/',views.comment_post)#提交评论
] + static(settings.MEDIA_URL, document_root=settings.MEDIA_ROOT)

def updateDish_post(request,dishID):
  """
  接受修改菜品的请求
  """
  dish_form = MerchantDish(request.POST,request.FILES)
  if dish_form.is_valid() :
    dish = Menu.objects.get(ID = dishID)
    dish.itemName = dish_form.cleaned_data['itemName']
    dish.itemText = dish_form.cleaned_data['itemText']
    dish.price = dish_form.cleaned_data['price']
    dish.picture = dish_form.cleaned_data['picture']
    dish.save()
    # dishChange = dish_form.clean()    
    return redirect('/MerchantSystem/')
  elif dish_form.errors is not None:
    print(dish_form.errors)
    return HttpResponse(str(dish_form.errors))

    <div class="media-left media-middle" >
        <!-- {{dish.url|default:"Null"}} -->
        <img class="media-object" width="150" height="150" src="/IMG/{{dish.picture|default:'img/default.jpg'}}" alt="">
    </div>