用户搜索Django数据库的能力

Question

我希望创建一个非常简单的表单，其中有几个下拉字段，允许用户查询我创建的餐馆数据库（我想使用字段'food'，'city'和'average rating'）。虽然我找到了使用单独的html页面（Django form to query database (models)）来实现这一点的方法，但我想在一个页面（restaurants.html）上实现这一点。

我正在使用Python 3.1.0，Django 2.0.1和Bootstrap 4.0。

感谢您的所有帮助。

我的models.py如下：

from django.db import models
import numpy as np

# Create your models here.
class Restaurant(models.Model):
    name = models.CharField(max_length=100, null=False)
    desc = models.CharField(max_length=100)
    web = models.CharField(max_length=100)
    phone = models.CharField(max_length=40)
    address = models.CharField(max_length=100)
    post_code = models.CharField(max_length=20)
    picture = models.ImageField(upload_to='images/restaurants', null=True)
    map = models.ImageField(upload_to='images/restaurants', null=True)

FOOD = ((1,'English'),
        (2,'French'),
        (3,'American'),
        (4,'Indian'),
        (5, 'Undefined'))
food = models.IntegerField(choices=FOOD, default=5)

CITY = ((1,'London'),
        (2,'Paris'))

city = models.IntegerField(choices=CITY, default=1)

STARS = ((1,'One'),
        (2,'Two'),
        (3,'Three'),
        (4,'Four'),)
CB_rating = models.IntegerField(choices=STARS, default=4)

def average_rating(self):
    all_ratings = map(lambda x: x.rating, self.review_set.all())
    return np.mean(all_ratings)

def __str__(self):
    return self.name

views.py：

from django.shortcuts import get_object_or_404, render
from .models import Review, Restaurant
from django.http import HttpResponseRedirect
from django.core.urlresolvers import reverse
from .forms import ReviewForm
import datetime

def review_list(request):
    latest_review_list = Review.objects.order_by('-pub_date')[:9]
    context = {'latest_review_list':latest_review_list}
    return render(request, 'review_list.html', context)


def review_detail(request, review_id):
    review = get_object_or_404(Review, pk=review_id)
    return render(request, 'review_detail.html', {'review': review})

def restaurant_list(request):
    restaurant_list = Restaurant.objects.order_by('-name')
    context = {'restaurant_list':restaurant_list}
    return render(request, 'restaurants.html', context)

def restaurant_detail(request, restaurant_id):
    restaurant = get_object_or_404(Restaurant, pk=restaurant_id)
    return render(request, 'restaurant_detail.html', 'restaurant':restaurant})

def user_review_list(request, username=None):
    if not username:
        username = request.user.username
    latest_review_list =     Review.objects.filter(user_name=username).order_by('-pub_date')
    context = {'latest_review_list':latest_review_list, 'username':username}
    return render(request, 'user_review_list.html', context)

restaurants.html：

{% extends 'base.html' %}
{% load staticfiles %}

{% block content %}
<div class="container">
    <div class="row">
        <div class="col-md-4 col-sm-offset-4" style="text-align: center">
          <h3>Search Criteria</h3>
          <hr>
        </div>
    </div>
</div>

<div class="container">
    <div class="row">
        <div class="col-md-4 col-sm-offset-4" style="text-align: center">
            <form method="get" action="/search/">
                Search Restaurants:<input type="text" name="q" id="id_q" value="{{ query }}"/>
                <input type="submit" value="Search" />
            </form>
        </div>
    </div>
</div>

<div class="container">
    <div class="row">
        <div class="col-md-4 col-sm-offset-4" style="text-align: center">
            <h3>Search Results</h3>
            <hr>
        </div>
    </div>
</div>

<div class="container">
  <div class="row">
    <div>
      {% if restaurant_list %}
      <div class="container">
      <div class="table-responsive">
        <table class="table table-bordered table-hover" style="text-align: center;">
          <caption class="text-center">A list of restaurants based on your search criteria above.</caption>
          <thead>
            <th class="col-xs-2">Name</th>
            <th class="col-xs-6">Description</th>
            <th class="col-xs-1" style="text-align: center">Food Type</th>
          </thead>
          <tbody>
            {% for restaurant in restaurant_list %}
            <tr>
              <td style="text-align: left;"><a href="{% url 'restaurants:restaurant_detail' restaurant.id %}"><strong>{{ restaurant.name }}</strong></a></td>
              <td style="text-align: left;">{{ restaurant.desc }}</td>
              <td style="text-align: center;">{{ restaurant.food }}</td>
            {% endfor %}
            </tr>
              </tbody>

        </table>
      </div>
    </div>
      {% else %}
      <h3>No restaurants match your search criteria.</h3>
      {% endif %}
    </div>
  </div>
</div>

{% endblock %}