If you want to add tags, categories, filters, and so on, to your Rails 5 models, the acts-as-taggable-on gem is the way to go. Using it with Rails 5 is fairly straightforward.
1. Add it to your Gemfile:
gem 'acts-as-taggable-on', '~> 6.0'
3. Install its migrations:
acts_as_taggable_on to your model. You don’t need to create a migration for your tags – acts-as-taggable-on handles that for you. You can change
:tags to anything you’d like –
# post.rb class Post < ApplicationRecord acts_as_taggable_on :tags end
6. Then, inside your controller, you’ll need to accept
:code_list, etc.) as a strong param. It’s the singular version of the word you used in your model, appended with
# posts_controller.rb class PostsController < ApplicationController # ... def post_params params.require(:post).permit(:title, :body, :tag_list) end end
7. Now you can add the tags to a form. Sometimes, you may be able to get away with
<%= f.input :tag_list %>, but I’ve had to use a slightly more complicated version in the past. Users can add multiple tags by separating them with commas:
<!-- views/posts/_form.html.erb --> <%= form.label :tag_list, "Tags" %> <%= form.text_field :tag_list, value: @post.send(:tag_list).to_s, placeholder: 'rails, development' %>
8. You can search by tagged filters, as well:
# routes.rb get '/tagged', to: "posts#tagged", as: :tagged # posts_controller.rb def tagged if params[:tag].present? @posts = Post.tagged_with(params[:tag]) else @posts = Post.all end end
9. And then list each post, plus the option to sort by tags in your view:
<!-- views/posts/index.html.erb --> <% @posts.each do |p| %> <h2><%= p.title %></h2> <div class="tags"> <% p.tag_list.each do |t| %> <%= link_to t, tagged_path(tag: t) %> <% end %> </div> <% end %>
Once you understand how it works, acts-as-taggable-on is a pretty easy gem to use. It has a lot of other features, as well, that you can learn more about on its GitHub page. Have fun tagging!