├── .gitignore
├── www
    └── blog
    │   ├── four
    │       └── index.html
    │   ├── one
    │       └── index.html
    │   ├── six
    │       └── index.html
    │   ├── two
    │       └── index.html
    │   ├── five
    │       └── index.html
    │   ├── seven
    │       └── index.html
    │   ├── three
    │       └── index.html
    │   └── index.html
├── src
    ├── blog
    │   ├── seven.liquid
    │   ├── one.liquid
    │   ├── two.liquid
    │   ├── five.liquid
    │   ├── four.liquid
    │   ├── six.liquid
    │   └── three.liquid
    └── blog.liquid
├── package.json
└── eleventy.config.js


/.gitignore:
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1 | node_modules
2 | 


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/www/blog/four/index.html:
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1 | 
2 | <h1>Dog 2</h1>
3 | 


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/www/blog/one/index.html:
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1 | 
2 | <h1>Cat 1</h1>
3 | 


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/www/blog/six/index.html:
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1 | 
2 | <h1>Misc 1</h1>
3 | 


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/www/blog/two/index.html:
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1 | 
2 | <h1>Dog 1</h1>
3 | 


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/www/blog/five/index.html:
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1 | 
2 | <h1>Fish 1</h1>
3 | 


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/www/blog/seven/index.html:
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1 | 
2 | <h1>No tags</h1>
3 | 


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/www/blog/three/index.html:
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1 | 
2 | <h1>Bird 1</h1>
3 | 


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/src/blog/seven.liquid:
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1 | ---
2 | title: No tags
3 | ---
4 | 
5 | <h1>{{ title }}</h1>
6 | 


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/src/blog/one.liquid:
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1 | ---
2 | title: Cat 1
3 | tags:
4 |   - cats
5 |   - pets
6 | ---
7 | 
8 | <h1>{{ title }}</h1>
9 | 


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/src/blog/two.liquid:
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1 | ---
2 | title: Dog 1
3 | tags:
4 |   - dogs
5 |   - pets
6 | ---
7 | 
8 | <h1>{{ title }}</h1>
9 | 


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/src/blog/five.liquid:
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1 | ---
2 | title: Fish 1
3 | tags:
4 |   - fish
5 |   - pets
6 | ---
7 | 
8 | <h1>{{ title }}</h1>
9 | 


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/src/blog/four.liquid:
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1 | ---
2 | title: Dog 2
3 | tags:
4 |   - dogs
5 |   - pets
6 | ---
7 | 
8 | <h1>{{ title }}</h1>
9 | 


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/src/blog/six.liquid:
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1 | ---
2 | title: Misc 1
3 | tags:
4 |   - hammers
5 |   - tools
6 | ---
7 | 
8 | <h1>{{ title }}</h1>
9 | 


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/src/blog/three.liquid:
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1 | ---
2 | title: Bird 1
3 | tags:
4 |   - birds
5 |   - pets
6 | ---
7 | 
8 | <h1>{{ title }}</h1>
9 | 


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/src/blog.liquid:
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 1 | ---
 2 | title: Pets
 3 | ---
 4 | 
 5 | <ul>
 6 | {% for p in collections.catsAndDogs -%}
 7 |   <li><a href="{{ p.url }}">{{ p.data.title }}</a> -- {{ p.data.tags | json }}</li>
 8 | {% endfor -%}
 9 | </ul>
10 | 


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/www/blog/index.html:
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1 | 
2 | <ul>
3 | <li><a href="/blog/four/">Dog 2</a> -- ["dogs","pets"]</li>
4 | <li><a href="/blog/one/">Cat 1</a> -- ["cats","pets"]</li>
5 | <li><a href="/blog/two/">Dog 1</a> -- ["dogs","pets"]</li>
6 | </ul>
7 | 


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/package.json:
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 1 | {
 2 |   "name": "11ty-1339",
 3 |   "version": "1.0.0",
 4 |   "description": "",
 5 |   "main": "eleventy.config.js",
 6 |   "scripts": {
 7 |     "build": "eleventy",
 8 |     "test": "echo \"Error: no test specified\" && exit 1"
 9 |   },
10 |   "keywords": [],
11 |   "author": "Peter deHaan <peter@deseloper.com>",
12 |   "license": "MPL-2.0",
13 |   "dependencies": {
14 |     "@11ty/eleventy": "^2.0.1"
15 |   }
16 | }
17 | 


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/eleventy.config.js:
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 1 | /**
 2 |  * @param {import("@11ty/eleventy/src/UserConfig")} eleventyConfig
 3 |  * @returns {ReturnType<import("@11ty/eleventy/src/defaultConfig")>}
 4 |  */
 5 | module.exports = function (eleventyConfig) {
 6 |   eleventyConfig.addCollection("catsAndDogs", function (collectionApi) {
 7 |     const tagsToFilter = ["cats", "dogs"];
 8 |     const pages = collectionApi.getFilteredByTag("pets");
 9 |     return pages.filter(page => {
10 |       const $tags = page.data.tags ?? [];
11 |       return tagsToFilter.some(tag => $tags.includes(tag));
12 |     });
13 |   });
14 | 
15 |   return {
16 |     dir: {
17 |       input: "src",
18 |       output: "www",
19 |     }
20 |   };
21 | };
22 | 


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