分类体系

分类体系是用于组织内容的分类系统。EmDash包含内置的分类和标签，并支持用于专业分类需求的自定义分类体系。

内置分类体系

EmDash提供两种默认分类体系：

默认情况下，两者都可用于文章集合。

管理术语

创建术语

POST /_emdash/api/taxonomies/category/terms
Content-Type: application/json
Authorization: Bearer YOUR_API_TOKEN

{
  "slug": "tutorials",
  "label": "Tutorials",
  "parentId": "term_abc",
  "description": "How-to guides and tutorials"
}

编辑术语

1. 前往分类体系术语页面

2. 点击术语旁边的编辑

3. 更新名称、slug、父级或描述

4. 点击保存

删除术语

1. 前往分类体系术语页面

2. 点击术语旁边的删除

3. 确认删除

查询分类体系

EmDash提供函数来查询分类体系术语并按术语筛选内容。

获取所有术语

检索分类体系的所有术语：

import { getTaxonomyTerms } from "emdash";

// Get all categories (returns tree structure)
const categories = await getTaxonomyTerms("category");

// Get all tags (returns flat list)
const tags = await getTaxonomyTerms("tag");

对于层级型分类体系，术语包含children数组：

interface TaxonomyTerm {
	id: string;
	name: string; // Taxonomy name ("category")
	slug: string; // Term slug ("news")
	label: string; // Display label ("News")
	parentId?: string;
	description?: string;
	children: TaxonomyTerm[];
	count?: number; // Number of entries with this term
}

获取单个术语

以下示例通过分类体系和slug获取一个术语：

import { getTerm } from "emdash";

const category = await getTerm("category", "news");
// Returns TaxonomyTerm or null

获取条目的术语

以下示例检索分配给单个条目的分类和标签：

import { getEntryTerms } from "emdash";

// Get all categories for a post
const categories = await getEntryTerms("posts", "post-123", "category");

// Get all tags for a post
const tags = await getEntryTerms("posts", "post-123", "tag");

按术语筛选内容

使用where过滤器的getEmDashCollection：

import { getEmDashCollection } from "emdash";

// Posts in the "news" category
const { entries: newsPosts } = await getEmDashCollection("posts", {
	status: "published",
	where: { category: "news" },
});

// Posts with the "javascript" tag
const { entries: jsPosts } = await getEmDashCollection("posts", {
	status: "published",
	where: { tag: "javascript" },
});

或使用便利函数：

import { getEntriesByTerm } from "emdash";

const newsPosts = await getEntriesByTerm("posts", "category", "news");

构建分类体系页面

分类归档

创建列出分类中文章的页面：

---
import { getTaxonomyTerms, getTerm, getEmDashCollection } from "emdash";
import Base from "../../layouts/Base.astro";

export async function getStaticPaths() {
  const categories = await getTaxonomyTerms("category");

  // Flatten hierarchical tree for routing
  function flatten(terms) {
    return terms.flatMap((term) => [term, ...flatten(term.children)]);
  }

  return flatten(categories).map((cat) => ({
    params: { slug: cat.slug },
    props: { category: cat },
  }));
}

const { category } = Astro.props;

const { entries: posts } = await getEmDashCollection("posts", {
  status: "published",
  where: { category: category.slug },
});
---

<Base title={category.label}>
  <h1>{category.label}</h1>
  {category.description && <p>{category.description}</p>}
  <p>{category.count} posts</p>

  <ul>
    {posts.map((post) => (
      <li>
        <a href={`/blog/${post.data.slug}`}>{post.data.title}</a>
      </li>
    ))}
  </ul>
</Base>

标签归档

创建列出带有标签的文章的页面：

---
import { getTaxonomyTerms, getEmDashCollection } from "emdash";
import Base from "../../layouts/Base.astro";

export async function getStaticPaths() {
  const tags = await getTaxonomyTerms("tag");

  return tags.map((tag) => ({
    params: { slug: tag.slug },
    props: { tag },
  }));
}

const { tag } = Astro.props;

const { entries: posts } = await getEmDashCollection("posts", {
  status: "published",
  where: { tag: tag.slug },
});
---

<Base title={`Posts tagged "${tag.label}"`}>
  <h1>#{tag.label}</h1>

  <ul>
    {posts.map((post) => (
      <li>
        <a href={`/blog/${post.data.slug}`}>{post.data.title}</a>
      </li>
    ))}
  </ul>
</Base>

分类列表小部件

显示带有文章数量的分类列表：

---
import { getTaxonomyTerms } from "emdash";

const categories = await getTaxonomyTerms("category");
---

<nav class="category-list">
  <h3>Categories</h3>
  <ul>
    {categories.map((cat) => (
      <li>
        <a href={`/category/${cat.slug}`}>
          {cat.label} ({cat.count})
        </a>
        {cat.children.length > 0 && (
          <ul>
            {cat.children.map((child) => (
              <li>
                <a href={`/category/${child.slug}`}>
                  {child.label} ({child.count})
                </a>
              </li>
            ))}
          </ul>
        )}
      </li>
    ))}
  </ul>
</nav>

标签云

根据使用情况显示不同大小的标签：

---
import { getTaxonomyTerms } from "emdash";

const tags = await getTaxonomyTerms("tag");

// Calculate font sizes based on count
const counts = tags.map((t) => t.count ?? 0);
const maxCount = Math.max(...counts, 1);
const minSize = 0.8;
const maxSize = 2;

function getSize(count: number) {
  const ratio = count / maxCount;
  return minSize + ratio * (maxSize - minSize);
}
---

<div class="tag-cloud">
  {tags.map((tag) => (
    <a
      href={`/tag/${tag.slug}`}
      style={`font-size: ${getSize(tag.count ?? 0)}rem`}
    >
      {tag.label}
    </a>
  ))}
</div>

在内容上显示术语

在文章上显示分类和标签：

---
import { getEntryTerms } from "emdash";

interface Props {
  collection: string;
  entryId: string;
}

const { collection, entryId } = Astro.props;

const categories = await getEntryTerms(collection, entryId, "category");
const tags = await getEntryTerms(collection, entryId, "tag");
---

<div class="post-terms">
  {categories.length > 0 && (
    <div class="categories">
      <span>Posted in:</span>
      {categories.map((cat, i) => (
        <>
          {i > 0 && ", "}
          <a href={`/category/${cat.slug}`}>{cat.label}</a>
        </>
      ))}
    </div>
  )}

  {tags.length > 0 && (
    <div class="tags">
      {tags.map((tag) => (
        <a href={`/tag/${tag.slug}`} class="tag">
          #{tag.label}
        </a>
      ))}
    </div>
  )}
</div>

自定义分类体系

为专业需求创建超越分类和标签的分类体系。

创建自定义分类体系

使用管理API创建分类体系：

POST /_emdash/api/taxonomies
Content-Type: application/json
Authorization: Bearer YOUR_API_TOKEN

{
  "name": "genre",
  "label": "Genres",
  "labelSingular": "Genre",
  "hierarchical": true,
  "collections": ["books", "movies"]
}

使用自定义分类体系

以与内置分类体系相同的方式查询和显示自定义分类体系：

import { getTaxonomyTerms, getEmDashCollection } from "emdash";

// Get all genres
const genres = await getTaxonomyTerms("genre");

// Get books in a genre
const { entries: sciFiBooks } = await getEmDashCollection("books", {
	where: { genre: "science-fiction" },
});

分配到集合

分类体系指定它们适用于哪些集合：

{
  "name": "difficulty",
  "label": "Difficulty Levels",
  "hierarchical": false,
  "collections": ["recipes", "tutorials"]
}

分类体系API参考

REST端点

向内容分配术语

以下请求向文章分配分类术语：

POST /_emdash/api/content/posts/post-123/terms/category
Content-Type: application/json
Authorization: Bearer YOUR_API_TOKEN

{
  "termIds": ["term_news", "term_featured"]
}

下一步

• 创建博客 - 在博客中使用分类和标签
• 查询内容 - 按分类体系术语筛选
• 处理内容 - 在编辑器中分配术语