如何解决此错误？字段“ id”应为数字，但为“ aapl”

编程问答 2022-11-01

问题描述

我正在尝试创建一个股票博客页面，现在在该项目中，我遇到了关于url的问题，因为我想做的是针对每个股票名称中创建的每个帖子，在该页面上显示该帖子，我的解释可能会有些混乱，但这是代码和错误，您可以看到。

错误

Traceback (most recent call last):
  File "C:\Users\snin2\anaconda3\envs\MyDjangoEnv\lib\site-packages\django\core\handlers\exception.py",line 34,in inner
    response = get_response(request)
  File "C:\Users\snin2\anaconda3\envs\MyDjangoEnv\lib\site-packages\django\core\handlers\base.py",line 115,in _get_response
    response = self.process_exception_by_middleware(e,request)
  File "C:\Users\snin2\anaconda3\envs\MyDjangoEnv\lib\site-packages\django\core\handlers\base.py",line 113,in _get_response
    response = wrapped_callback(request,*callback_args,**callback_kwargs)
  File "C:\Users\snin2\Desktop\basura\lapagina\app1\views.py",line 59,in StockView
    stock_posts = Post.objects.filter(stock=sym.lower())
  File "C:\Users\snin2\anaconda3\envs\MyDjangoEnv\lib\site-packages\django\db\models\manager.py",line 82,in manager_method
    return getattr(self.get_queryset(),name)(*args,**kwargs)
  File "C:\Users\snin2\anaconda3\envs\MyDjangoEnv\lib\site-packages\django\db\models\query.py",line 904,in filter
    return self._filter_or_exclude(False,*args,line 923,in _filter_or_exclude
    clone.query.add_q(Q(*args,**kwargs))
  File "C:\Users\snin2\anaconda3\envs\MyDjangoEnv\lib\site-packages\django\db\models\sql\query.py",line 1350,in add_q
    clause,_ = self._add_q(q_object,self.used_aliases)
  File "C:\Users\snin2\anaconda3\envs\MyDjangoEnv\lib\site-packages\django\db\models\sql\query.py",line 1377,in _add_q
    child_clause,needed_inner = self.build_filter(
  File "C:\Users\snin2\anaconda3\envs\MyDjangoEnv\lib\site-packages\django\db\models\sql\query.py",line 1311,in build_filter
    condition = self.build_lookup(lookups,col,value)
  File "C:\Users\snin2\anaconda3\envs\MyDjangoEnv\lib\site-packages\django\db\models\sql\query.py",line 1165,in build_lookup
    lookup = lookup_class(lhs,rhs)
  File "C:\Users\snin2\anaconda3\envs\MyDjangoEnv\lib\site-packages\django\db\models\lookups.py",line 22,in __init__
    self.rhs = self.get_prep_lookup()
  File "C:\Users\snin2\anaconda3\envs\MyDjangoEnv\lib\site-packages\django\db\models\fields\related_lookups.py",in get_prep_lookup
    self.rhs = target_field.get_prep_value(self.rhs)
  File "C:\Users\snin2\anaconda3\envs\MyDjangoEnv\lib\site-packages\django\db\models\fields\__init__.py",line 1774,in get_prep_value
    raise e.__class__(
ValueError: Field 'id' expected a number but got 'aapl'.

urls.py（我只会显示相关的一个）

from django.urls import path
from app1 import views
from .views import PostView,ArticleDetailView,AddPostView,UpdatePostView,DeletePostView,AddCategoryView,CategoryView,LikeView,MyPostsView,AddCommentView,UpdateCommentView,DeleteCommentView

app_name = 'app1'

urlpatterns = [
    
    path('stock/<str:sym>/',views.StockView,name = 'stock'),]

views.py 

def StockView(request,sym):
    stock_posts = Post.objects.filter(stock=sym.lower())
    return render(request,'app1/stockview.html',{'stock':stock_posts})

models.py 

class StockNames(models.Model):
    name = models.CharField(max_length=255)
    symbol = models.CharField(max_length=255)

    def __str__(self):
        return self.symbol
        
    

class Post(models.Model):
    title = models.CharField(max_length= 255)
    header_image = models.ImageField(null = True,blank = True,upload_to = 'images/')
    author = models.ForeignKey(User,on_delete=models.CASCADE)
    body = RichTextField(blank = True,null = True)
    #body = models.TextField()
    post_date = models.DateField(auto_Now_add=True)
    category = models.CharField(max_length=255,default='coding')
    snippet = models.CharField(max_length=255)
    likes = models.ManyToManyField(User,related_name = 'blog_posts')
    stock = models.ForeignKey(StockNames,null=True,on_delete=models.CASCADE)

    def total_likes(self):
        return self.likes.count()

    def __str__(self):
        return self.title + ' | ' + str(self.author)
    
    def get_absolute_url(self):
        return reverse('app1:article-detail',args=(self.id,))

解决方法

要用Post过滤symbol，您需要跨越 

stock_posts = Post.objects.filter(stock__symbol=sym.lower())
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