How to generate pages for each tag in nanoc

Question

I am new to nanoc and I am still finding my around it. I am able to get my site ready, it looks good and functions good, too. But I need to have a tags area. I am able to achieve that with

<%= tags_for(post, params = {:base_url => "http://example.com/tag/"}) %>

But how do I generate pages for tag? So for instance there is a tag called "NFL", so every time a user clicks on it, he/she should be directed to http://example.com/tag/nfl with a list of articles that correspond with NFL.

I can setup a layout which will do that. But then what kind of logic should be I using? And also do I need to have a helper for this?

score 21 · Accepted Answer · edited Feb 15 '14 at 09:38

You can use a preprocess block in your Rules file in order to generate new items dynamically. Here’s an example of a preprocess block where a single new item is added:

preprocess do
  items << Nanoc::Item.new(
    "some content here",
    { :attributes => 'here', :awesomeness => 5000 },
    "/identifier/of/this/item")
end

If you want pages for each tag, you need to collect all tags first. I’m doing this with a set because I do not want duplicates:

require 'set'
tags = Set.new
items.each do |item|
  item[:tags].each { |t| tags.add(t.downcase) }
end

Lastly, loop over all tags and generate items for them:

tags.each do |tag|
  items << Nanoc::Item.new(
    "",
    { :tag => tag },
    "/tags/#{tag}/")
end

Now, you can create a specific compilation rule for /tags/*/, so that it is rendered using a "tags" layout, which will take the value of the :tag attribute, find all items with this tag and show them in a list. That layout will look somewhat like this:

<h1><%= @item[:tag] %></h1>
<ul>
  <% items_with_tag(@item[:tag]).each do |i| %>
    <li><%= link_to i[:title], i %></li>
  <% end %>
</ul>

And that, in broad strokes, should be what you want!

Note that if you have inconsistently normalized tags, you'll end up with "duplicates" here... and if you have a case-insensitive filesystem it could cause you all sorts of confusion down the line. Save yourself the headaches I ran into and `tag.downcase` or something first :) — bobthecow, Jan 23 '13 at 14:40
This is a great answer, it should be in the documentation @ddfreyne ;). — Pablo Olmos de Aguilera C., Aug 06 '14 at 19:47
is there any reason this is not in the Tagging library, along with other useful things such as function to get list of tags etc. — majkinetor, Jul 04 '15 at 13:19

How to generate pages for each tag in nanoc

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