十月 CMS（Rainlab 博客）- 来自同一类别的下一个和上一个帖子链接

Question

我有一个博客文章页面，我在其中使用类别作为 url 中的硬编码参数。

网址是这样的

url = "/category1/:slug"

我在这个布局中使用 blogPost 组件。 我可以使用模板中的以下代码获取nextPost 和prevPost 链接

{% set nextPost = blogPost.post.nextPost %}
{% set prevPost = blogPost.post.previousPost %}

但我想限制nextPost 和prevPost 与blogPost.post 属于同一类别，即category1

blogPost.post 只属于一个类别

我检查了Post 模型有一个方法scopeFilterCategories 但我不确定如何使用它或它是否有相同的用途。

代码

这是配置部分

title = "Category1 post"
url = "/category1/:slug"
layout = "default"
is_hidden = 0
robot_index = "index"
robot_follow = "follow"

[blogPost]
slug = "{{ :slug }}"
categoryPage = "category1"

Answer 1

您似乎没有提供开箱即用的功能

我创建了 sn-ps 可以完成这项工作。

在你page's code block添加这个代码sn-p [next previous工作基于published_at字段（在表单上发布）]

public function nextPost($post) {

    // get current cats
    $postCats = $post->categories->pluck('id')->toArray();

    // Here you need to pass it as we are 
    // hardcoding category slug in URL so we have no data of category

    // IF YOU DONT WANT CAT COME FROM POST
    // YOU CAN HARD CODE THEM $postCats = ['2'] 
    // here 2 is id of category

    // use this cats to scope 
    $nextPost = $post->isPublished()->applySibling(-1)
                   ->FilterCategories($postCats)->first();

    // check if next is not availabe then return false
    if(!$nextPost) {        
        return false;
    }

    // create page link here same page
    $postPage = $this->page->getBaseFileName();

    // set URl so we can direct access .url
    $nextPost->setUrl($postPage, $this->controller);

    // set Cat URl so we can use it directly if needed
    $nextPost->categories->each(function($category) {
        $category->setUrl($this->categoryPage, $this->controller);
    });

    return $nextPost;

}

public function previousPost($post) {

    // get current cats
    $postCats = $post->categories->pluck('id')->toArray();

    // IF YOU DONT WANT CAT COME FROM POST
    // YOU CAN HARD CODE THEM $postCats = ['2'] 
    // here 2 is id of category

    // use this cats to scope 
    $prevPost = $post->isPublished()->applySibling(1)
                   ->FilterCategories($postCats)->first();

    // check if nprevious ext is not availabe then return false
    if(!$prevPost) {        
        return false;
    }

    // create page link here same page
    $postPage = $this->page->getBaseFileName();

    // set URl so we can direct access .url
    $prevPost->setUrl($postPage, $this->controller);

    // set Cat URl so we can use it directly if needed
    $prevPost->categories->each(function($category) {
        $category->setUrl($this->categoryPage, $this->controller);
    });

    return $prevPost;

}

您可以在Markup area 中添加此代码。

{% component 'blogPost' %}

{% set nextPostRecord = this.controller.pageObject.nextPost(blogPost.post) %}
{% set previousPostRecord = this.controller.pageObject.previousPost(blogPost.post) %}

{% if previousPostRecord %}
    <a href="{{ previousPostRecord.url }}"> Previous </a>    
{% endif %}

{% if nextPostRecord %}
    <a href="{{ nextPostRecord.url }}"> Next </a>    
{% endif %}

这将尊重 category 并仅显示该类别的帖子

如有疑问请评论。