如何在 Wagtail CMS 上将查询外部模型的上下文添加到另一个模型的模板

How to add context querying an external model to another model's template on Wagtail CMS

我有通常的 home.HomePage() 默认情况下由 wagtail 设置的模型,这是它包含的内容:

class HomePage(Page):
advertised_lowest_price = models.FloatField(blank=True, null=True, max_length=20,)
season_year = models.PositiveIntegerField(blank=True, null=True)
season_statement = RichTextField(blank=True, null=True, help_text="THIS MUST BE IN 'h2' TAG! To avoid frontend"
                                                                  " display irregularities, you must use the"
                                                                  " H2 tag",
                                 features=['bold', 'italic', 'hr', 'link', 'document-link', 'embed', 'underline',
                                           'strike-through', 'h2', 'h3'],
                                 )
premium_topic = models.CharField(null=True, blank=True, help_text='Premium Products text', max_length=80)
premium_sub_topic = models.CharField(null=True, blank=True, help_text='Premium Products Sub-topic text',
                                     max_length=80)
article_section_topic = models.CharField(null=True, blank=True, max_length=80)

def get_context(self, request):
    context = super().get_context(request)
    context['home_page'] = HomePage.objects.live().all()

    def carousel_products():
        carousel_items_list = []
        for carousel_item in AdministratorProducts.objects.all():
            carousel_items_list.append(carousel_item.is_carousel())
            return carousel_items_list

    context['carousel_1'] = carousel_products()[0]

    return context

content_panels = Page.content_panels + [
    FieldPanel('advertised_lowest_price'),
    FieldPanel('season_year'),
    FieldPanel('season_statement'),
    FieldPanel('premium_topic'),
    FieldPanel('premium_sub_topic'),
    FieldPanel('article_section_topic'),
]

template = 'home/index.html'

def __str__(self):
    return self.season_statement

也就是说,我还有一个轮播模式,可以作为索引页轮播上其他产品的外壳 > index.html

这是旋转木马的模型:

class ImageCarousel(Page):
carousel_name = models.CharField(max_length=100, default='ART!')
date_time_stamp = models.DateTimeField(blank=True, null=True, help_text='Date product was added to Carousel.')

class Meta:
    verbose_name_plural = 'Images on the Carousel'

def __str__(self):
    return self.title

content_panels = Page.content_panels + [
    FieldPanel('carousel_name'),
]

template = 'home/index.html'

您可能已经注意到,ImageCarousel 也写入与 HomePage 相同的模板,即 index.html

与此同时,我从另一个应用程序中获得了另一个模型,该模型具有 ImageCarousel 作为 ForeignKey。这是位于 'ixorabloom_administrator_products/models.py':

的模型
class AdministratorProducts(Page):
administrator_product_name = models.CharField(max_length=100)
administrator_product_bio = models.TextField(blank=True, null=True)
administrator_product_primary_genre = models.CharField(max_length=4, choices=ART_GENRES, null=True, blank=True)
administrator_product_secondary_genre = models.TextField(help_text='Comma (,) separated list of secondary art '
                                                                   'genres',
                                                         null=True,
                                                         blank=True)
administrator_product_carousel = models.ForeignKey("home.ImageCarousel",
                                                   null=True,
                                                   blank=True,
                                                   on_delete=models.SET_NULL)
administrator_product_carousel_year = models.PositiveIntegerField(help_text="Year to be displayed if this product"
                                                                            " is on the carousel",
                                                                  null=True,
                                                                  blank=True)
administrator_product_date_of_creation = models.DateField(null=True, blank=True, help_text='Date product was made')
administrator_product_website_link = models.URLField(blank=True, null=True, help_text='External website where this'
                                                                                      'product can be found or'
                                                                                      'bought.')
administrator_product_email_address = models.EmailField(blank=True, null=True, help_text='External Mailing site'
                                                                                         'where this product can be'
                                                                                         'ordered.')
administrator_product_picture = models.ForeignKey("wagtailimages.Image",
                                                  null=True,
                                                  blank=True,
                                                  on_delete=models.SET_NULL)
administrator_product_price = models.FloatField(null=True, blank=True)

content_panels = Page.content_panels + [
    FieldPanel('administrator_product_name'),
    FieldPanel('administrator_product_bio'),
    FieldPanel('administrator_product_primary_genre'),
    FieldPanel('administrator_product_secondary_genre'),
    FieldPanel('administrator_product_carousel'),
    FieldPanel('administrator_product_carousel_year'),
    FieldPanel('administrator_product_website_link'),
    FieldPanel('administrator_product_email_address'),
    ImageChooserPanel('administrator_product_picture'),
    FieldPanel('administrator_product_price'),
    FieldPanel('administrator_product_date_of_creation'),
]

class Meta:
    verbose_name_plural = 'Administrator Art Products'

def __str__(self):
    return self.administrator_product_name

def is_carousel(self):
    if self.administrator_product_carousel:
        return True
    else:
        return False

回头看HomePage,那里有个get_context()方法。这个方法实际上做了一个循环来收集(来自管理员的)与 ImageCarouselForeignKey 关系的产品。方法如下:

    def get_context(self, request):
    context = super().get_context(request)
    context['home_page'] = HomePage.objects.live().all()

    def carousel_products():
        carousel_items_list = []
        for carousel_item in AdministratorProducts.objects.all():
            carousel_items_list.append(carousel_item.is_carousel())
            return carousel_items_list

    context['carousel_1'] = carousel_products()[0]

    return context

**您也可以在 ** HomePage().get_context() 中找到它。

问题来了。上下文在前端不起作用。我用 python manage.py shell 测试了 carousel_products() 函数的性能,它完成了工作。这里的问题是它没有显示在由模板支持的网页上:'home/index.html'

这是 'home/index.html' 的部分,它使用了新添加的上下文:

            {% if carousel_1 %}
        <div class="hs-item">
            <div class="hs-left"><img src="{{ carousel_1.administrator_product_picture.url }}" alt=""></div>
            <div class="hs-right">
                <div class="hs-content">
                    <div class="price">from ₦{{ carousel_1.administrator_product_price }}</div>
                    <h2 style="margin-bottom: 0px;">
                        <span>{{ carousel_1.administrator_product_carousel_year }}</span>
                        <br>
                    </h2>
                    <a href="" class="site-btn">Shop NOW!</a>
                </div>  
            </div>
        </div>
        {% endif %}

我做错了什么?我也可以解决这个问题吗?任何我没有添加到问题中的内容,请告诉我,我将提供所需的数据。 我在 Wagtail CMS 上也遇到了非常困难的情况。我真的希望有人能清楚地解释他们的模板设计和使用系统。我的实现全部来自 Wagtail 文档。谢谢!

代码的问题在 HomePage() 模型中。准确地说,get_context().carousel_products()。这是对 carousel_products().

的更正
        def carousel_products():
            carousel_items_list = []
            for carousel_item in AdministratorProducts.objects.all():
                if carousel_item.is_carousel():
                    carousel_items_list.append(carousel_item)
                return carousel_items_list

原始代码的问题在于 for 循环正在查询 AdministratorProducts(即 AdministratorProducts.objects.all())中的每个产品,并检查每个产品是否为轮播项目。返回的是 TrueFalse.

在原始代码中,附加到 carousel_items_list 的是该检查的返回值(即 TrueFalse),而不是产品或产品名称.

我的解决方案修复了函数性能判断错误。现在函数 returns 正确的数据和模板加载所需的数据。