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python之UnboundLocalError at/blog/search/赋值前引用的局部变量 'cd'

2025年05月04日34lvdongjie

我正在尝试使用 solr 设置 django-haystack，但我一直收到错误:

UnboundLocalError at /blog/search/ local variable 'cd' referenced before assignment

我想可能是我的

views.py

有点不对，，，。 我的应用名称为“博客”，上面已经有好几个博客了

添加核心博客后显示8个文档

这是我的

settings.py

# Build paths inside the project like this: os.path.join(BASE_DIR, ...) 
import os 
 
BASE_DIR = os.path.dirname(os.path.dirname(os.path.abspath(__file__))) 
 
 
# Quick-start development settings - unsuitable for production 
# See https://docs.djangoproject.com/en/1.8/howto/deployment/checklist/ 
 
# SECURITY WARNING: keep the secret key used in production secret! 
SECRET_KEY = 'e8m%vu0d&_0o-u*0@^*oh-2k4+j8_$c@qdj@)p353s%5p)2bx^' 
 
# SECURITY WARNING: don't run with debug turned on in production! 
DEBUG = True 
 
ALLOWED_HOSTS = [] 
 
SITE_ID = 1 
 
# Application definition 
 
INSTALLED_APPS = ( 
    'django.contrib.admin', 
    'django.contrib.auth', 
    'django.contrib.contenttypes', 
    'django.contrib.sessions', 
    'django.contrib.messages', 
    'django.contrib.staticfiles', 
    'blog', 
    'taggit', 
    'django.contrib.sites', 
    'django.contrib.sitemaps', 
    'haystack', 
) 
 
MIDDLEWARE_CLASSES = ( 
    'django.contrib.sessions.middleware.SessionMiddleware', 
    'django.middleware.common.CommonMiddleware', 
    'django.middleware.csrf.CsrfViewMiddleware', 
    'django.contrib.auth.middleware.AuthenticationMiddleware', 
    'django.contrib.auth.middleware.SessionAuthenticationMiddleware', 
    'django.contrib.messages.middleware.MessageMiddleware', 
    'django.middleware.clickjacking.XFrameOptionsMiddleware', 
    'django.middleware.security.SecurityMiddleware', 
) 
 
ROOT_URLCONF = 'mysite.urls' 
 
TEMPLATES = [ 
    { 
        'BACKEND': 'django.template.backends.django.DjangoTemplates', 
        'DIRS': [], 
        'APP_DIRS': True, 
        'OPTIONS': { 
            'context_processors': [ 
                'django.template.context_processors.debug', 
                'django.template.context_processors.request', 
                'django.contrib.auth.context_processors.auth', 
                'django.contrib.messages.context_processors.messages', 
            ], 
        }, 
    }, 
] 
 
WSGI_APPLICATION = 'mysite.wsgi.application' 
 
 
# Database 
# https://docs.djangoproject.com/en/1.8/ref/settings/#databases 
 
DATABASES = { 
    'default': { 
        'ENGINE': 'django.db.backends.sqlite3', 
        'NAME': os.path.join(BASE_DIR, 'db.sqlite3'), 
    } 
} 
 
 
# Internationalization 
# https://docs.djangoproject.com/en/1.8/topics/i18n/ 
 
LANGUAGE_CODE = 'en-us' 
 
TIME_ZONE = 'UTC' 
 
USE_I18N = True 
 
USE_L10N = True 
 
USE_TZ = True 
 
 
# Static files (CSS, JavaScript, Images) 
# https://docs.djangoproject.com/en/1.8/howto/static-files/ 
 
STATIC_URL = '/static/' 
 
 
 
HAYSTACK_CONNECTIONS = { 
    'default': { 
        'ENGINE': 'haystack.backends.solr_backend.SolrEngine', 
        'URL': 'http://127.0.0.1:8983/solr/blog' 
    }, 
}

我已将架构放入 schema.xml

我的

forms.py

from django import forms 
from .models import Comment 
 
 
class EmailPostForm(forms.Form): 
    name = forms.CharField(max_length=25) 
    email = forms.EmailField() 
    to = forms.EmailField() 
    comments = forms.CharField(required=False, widget=forms.Textarea) 
 
 
class CommentForm(forms.ModelForm): 
    class Meta: 
        model = Comment 
        fields = ('name', 'email', 'body') 
 
 
class SearchForm(forms.Form): 
    query = forms.CharField()

我的(猜猜这里有什么问题？？)

views.py

from django.shortcuts import render, get_object_or_404 
from django.core.paginator import Paginator, EmptyPage, PageNotAnInteger 
from django.views.generic import ListView 
from django.core.mail import send_mail 
from django.db.models import Count 
 
from taggit.models import Tag 
 
from .models import Post, Comment 
from .forms import EmailPostForm, CommentForm, SearchForm 
from haystack.query import SearchQuerySet 
 
......... 
 
def post_search(request): 
    form = SearchForm() 
    if 'query' in request.GET: 
        form = SearchForm(request.GET) 
        if form.is_valid(): 
            cd = form.cleaned_data 
            results = SearchQuerySet().models(Post).filter(content=cd['query']).load_all() 
            # count total results 
            total_results = results.count() 
    return render(request, 'blog/post/search.html', {'form': form, 
                                                     'cd': cd, 
                                                     'results': results, 
                                                     'total_results': total_results})

我的

search.html

{% extends "blog/base.html" %} 
 
{% block title %}Search{% endblock %} 
 
{% block content %} 
    {% if "query" in request.GET %} 
        <h1>Posts containing "{{ cd.query }}"</h1> 
        <h3>Found {{ total_results }} result{{ total_results|pluralize }}</h3> 
        {% for result in results %} 
            {% with post=result.object %} 
                <h4><a href="{{ post.get_absolute_url }}">{{ post.title }}</a></h4> 
                {{ post.body|truncatewords:5 }} 
            {% endwith %} 
        {% empty %} 
            <p>There are no results for your query.</p> 
        {% endfor %} 
        <p><a href="{% url "blog:post_search" %}">Search again</a></p> 
    {% else %} 
        <h1>Search for posts</h1> 
        <form action="." method="get"> 
            {{ form.as_p }} 
            <input type="submit" value="Search"> 
        </form> 
    {% endif %} 
{% endblock %}

urls.py

from django.conf.urls import url 
from . import views 
from .feeds import LatestPostsFeed 
 
 
urlpatterns = [ 
        ..... 
        url(r'^search/$', views.post_search, name='post_search'), 
]

当我点击博客/搜索时它只显示错误

error message

Environment: 
 
 
Request Method: GET 
Request URL: http://127.0.0.1:8000/blog/search/ 
 
Django Version: 1.8.8 
Python Version: 3.4.4 
Installed Applications: 
('django.contrib.admin', 
 'django.contrib.auth', 
 'django.contrib.contenttypes', 
 'django.contrib.sessions', 
 'django.contrib.messages', 
 'django.contrib.staticfiles', 
 'blog', 
 'taggit', 
 'django.contrib.sites', 
 'django.contrib.sitemaps', 
 'haystack') 
Installed Middleware: 
('django.contrib.sessions.middleware.SessionMiddleware', 
 'django.middleware.common.CommonMiddleware', 
 'django.middleware.csrf.CsrfViewMiddleware', 
 'django.contrib.auth.middleware.AuthenticationMiddleware', 
 'django.contrib.auth.middleware.SessionAuthenticationMiddleware', 
 'django.contrib.messages.middleware.MessageMiddleware', 
 'django.middleware.clickjacking.XFrameOptionsMiddleware', 
 'django.middleware.security.SecurityMiddleware') 
 
 
Traceback: 
File "/Library/Frameworks/Python.framework/Versions/3.4/lib/python3.4/site-packages/django/core/handlers/base.py" in get_response 
  132.                     response = wrapped_callback(request, *callback_args, **callback_kwargs) 
File "/Users/korekyourin/books/djexample/mysite/blog/views.py" in post_search 
  112.                                                      'cd': cd, 
 
Exception Type: UnboundLocalError at /blog/search/ 
Exception Value: local variable 'cd' referenced before assignment

请您参考如下方法:

首先，感谢安德烈对我的回答，，，这是我的新

views.py

....... 
 
def post_search(request): 
    form = SearchForm() 
    if 'query' in request.GET: 
        form = SearchForm(request.GET) 
        if form.is_valid(): 
            cd = form.cleaned_data 
            results = SearchQuerySet().models(Post).filter(content=cd['query']).load_all() 
            # count total results 
            total_results = results.count() 
        return render(request, 'blog/post/search.html', {'form': form, 
                                                         'cd': cd, 
                                                         'results': results, 
                                                         'total_results': total_results}) 
 
 
    return render(request, 'blog/post/search.html', {'form': form,})


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