HTML模板上的Django过滤器函数_Django_Django Models_Django Rest Framework_Django Views_Django Templates

HTML模板上的Django过滤器函数

django django-models django-rest-framework

HTML模板上的Django过滤器函数,django,django-models,django-rest-framework,django-views,django-templates,Django,Django Models,Django Rest Framework,Django Views,Django Templates,我被一个问题缠住了。我需要使用for循环中的list.id筛选所有列表。不幸的是，无法解析Django中的筛选器函数。是否有其他解决方案或解决方法？如何在Django HTML模板中运行函数。谢谢 index.html {% extends "auctions/layout.html" %} {% block body %} <h2>Active Listings</h2> {% if not listing %} <h3>Nothing

我被一个问题缠住了。我需要使用for循环中的list.id筛选所有列表。不幸的是，无法解析Django中的筛选器函数。是否有其他解决方案或解决方法？如何在Django HTML模板中运行函数。谢谢

index.html

{% extends "auctions/layout.html" %}

{% block body %}
<h2>Active Listings</h2>
{% if not listing %}
<h3>Nothing listed...</h3>
{% endif %}
{% for list in listing %}
<h3>Listing: {{ list.title }}</h3>
{% if list.photo != "" %}
<img src="{{ list.photo }}">
{% endif %}
<p>{{ list.description }}</p>
{% if not bids.filter(listing=list.id) %}    #This line could not be parsed
<h5>${{ list.price }}</h5>
{% else %}
<h5>${{ bids.filter(listing=list.id).order_by(-bids).first().bids  }}</h5> #This line could not be parsed
{% endif %}
<p>
{% if not bids.filter(listing=list.id).count() %} #This line could not be parsed
0
{% else %}
{{ bids.filter(listing=list.id).count() }} #This line could not be parsed
{% endif %}
bid(s) so far.
    {% if bids.filter(listing=list.id).order_by(-bids).first().bidder == user.username %}       #This line could not be parsed
    Your bid is the current bid.
    {% elif not bids.filter(listing=list.id).order_by(-bids).first().bidder %}      #This line could not be parsed
    There is no bid.
    {% elif bids.filter(listing=list.id).order_by(-bids).first().bidder != user.username %}     #This line could not be parsed
    {{ bids.filter(listing=list.id).order_by(-bids).first().bidder }} is the current bid.   #This line could not be parsed
    {% endif %}
</p>
{% if user.username != list.user and user.is_authenticated %}
<form action="{% url "index" %} method="post">
{% for form in forms %}
    {{ form }}
    <input type="submit" value="Bid">
</form>
{% endfor %%}
{% endif %}
<h4>Details</h4>
<ul>
    {% if user.username == list.user %}
    <li>Listed by: You</li>
    {% else %}
    <li>Listed by: {{ list.user }}</li>
    {% endif %}
    <li>Category: {{ list.category }}</li>
</ul>
<hr>
{% endfor %}
{% endblock %}

型号.py

from .models import User, AuctionList, Bids, Comments
from .forms import AuctionForm, BidsForm


def index(request):
    if request.method == "POST":
        pass
    else:
        AL = AuctionList.objects.all()
        Bd = Bids.objects.all()
        forms = BidsForm()
        return render(request, "auctions/index.html", {
            "listing": AL.order_by("id"),
            "bids": Bd,
            "forms": forms
        })

from django.contrib.auth.models import AbstractUser
from django.db import models


class User(AbstractUser):
    pass


class AuctionList(models.Model):
    CATEGORY_CHOICES = [
        ('Books', 'Books'),
        ('Business & Industrial', 'Business & Industrial'),
        ('Clothing, Shoes & Accessories', 'Clothing, Shoes & Accessories'),
        ('Collectibles', 'Collectibles'),
        ('Consumer Electronics', 'Consumer Electronics'),
        ('Crafts', 'Crafts'),
        ('Dolls & Bears', 'Dolls & Bears'),
        ('Home & Garden', 'Home & Garden'),
        ('Motors', 'Motors'),
        ('Pet Supplies', 'Pet Supplies'),
        ('Sporting Goods', 'Sporting Goods'),
        ('Sports Mem, Cards & Fan Shop', 'Sports Mem, Cards & Fan Shop'),
        ('Toys & Hobbies', 'Toys & Hobbies'),
        ('Antiques', 'Antiques'),
        ('Computers/Tablets & Networking', 'Computers/Tablets & Networking')
    ]

    id = models.AutoField(primary_key=True)
    user = models.CharField(max_length=20, default='None')
    title = models.CharField(max_length=20)
    category = models.CharField(
        max_length=30, choices=CATEGORY_CHOICES, default='Books')
    description = models.TextField()
    price = models.FloatField()
    photo = models.URLField(max_length=200, blank=True)

    def __str__(self):
        return f"({self.id}) | Title: {self.title} | Category: {self.category} | Price: {self.price} | Posted by: {self.user}"


class Bids(models.Model):
    bidder = models.CharField(max_length=20, default='None')
    listing = models.ForeignKey(
        AuctionList, on_delete=models.CASCADE, related_name="bids")
    bids = models.FloatField()

    def __str__(self):
        return f"Listing Key: {self.listing} | Bids: {self.bids}"

答案是肯定的，您可以在html模板中运行过滤器函数。事实上，过滤函数适用于django模板中的任何地方，并且经常在django模板中使用，您可以在django中更准确地找到它，如

您还可以根据需要创建一个过滤器函数，并在模板中的任何位置使用它，即Django Templatetags。这些模板标记只不过是一种您自己定义并在模板中实现的函数。下面我将逐步向您解释：对于reference，我的项目名称是“working\u blog\u python”，应用程序名称是“branch”

1。打开终端并键入

(working_blog_python) $ cd branch
(working_blog_python) $ mkdir templatetags
(working_blog_python) $ touch templatetags/any_name_tags.py

2。现在进入

any_name_tags.py

你可以这样写你的过滤函数

from django import template
register = template.Library()
@register.filter_function
def hrs(self):
    return self.name.replace('-', ' ')

3。现在您可以在模板中的任何位置使用此

hrs（）

功能，但不要忘记在模板中加载

{%load name\u tags%}

name\u标签

<p>Shop is located in {{branch.state | hrs | title}}.</p>

商店位于{{branch.state | hrs | title}}

您可以在views.py中创建另一个函数，并将其传递到索引函数中（下面的示例为您介绍views.py和index.html）

def build\u布局（用户名）：
final_html=None
对于列表中的列表：
final_html='Listing:{}'。格式（list.title）
如果是list.photo：
final_html+='{}'.格式（list.description）
如果不是list.bids:#无法分析此行
最终html+='${}'。格式（list.price）
其他：
final_html+='${}.format（list.bids.order_by（-bids.first（）.bids）#无法分析此行
最终html+='{}到目前为止的出价'。格式（list.bids.count（））
如果list.bids.order_by（-bids）.first（）。投标人==用户名：
final_html+=“您的出价是当前出价。”
其他：
final_html+=“没有出价。”
返回最终的html
def索引（请求）：
如果request.method==“POST”：
通过
其他：
AL=AuctionList.objects.all（）
Bd=Bids.objects.all（）
表格=投标表格（）
返回渲染（请求“auctions/index.html”{
“清单”：所有订单由（“id”），
“投标”：屋宇署，
“形式”：形式，
“拍卖布局”：构建拍卖布局（request.user.username）
})
#拍卖/index.html
{%extends“auctions/layout.html”%}
{%block body%}
出售中的物品
{%如果未列出%}
没有列出。。。
{%endif%}
{{拍卖|布局|安全}
......

def build_auctions_layout(username):
    final_html = None        
    for list in listing:
        final_html = '<h3>Listing: {}</h3>'.format(list.title)
        if list.photo:
            final_html += '<img src="{}"'.format(list.photo)
            final_html += '<p>{}</p>'.format(list.description)
        if not list.bids:    #This line could not be parsed
            final_html += '<h5>${}</h5>'.format(list.price)
        else:
            final_html += '<h5>${}</h5>'.format(list.bids.order_by(-bids).first().bids  ) #This line could not be parsed

        final_html += '<p>{} bid(s) so far'.format(list.bids.count())

        if list.bids.order_by(-bids).first().bidder == username:
           final_html += 'Your bid is the current bid.</p>'
        else:
           final_html += 'There is no bid.</p>'

    return final_html

def index(request):
    if request.method == "POST":
        pass
    else:
        AL = AuctionList.objects.all()
        Bd = Bids.objects.all()
        forms = BidsForm()
        return render(request, "auctions/index.html", {
            "listing": AL.order_by("id"),
            "bids": Bd,
            "forms": forms,
            "auctions_layout": build_auctions_layout(request.user.username)
        })

#auctions/index.html

{% extends "auctions/layout.html" %}

{% block body %}
  <h2>Active Listings</h2>
{% if not listing %}
  <h3>Nothing listed...</h3>
{% endif %}

{{auctions_layout|safe}}

......