View microposts by tag

app/controllers/tags_controller.rb

@@ -0,0 +1,19 @@
+# frozen_string_literal: true
+
+class TagsController < ApplicationController
+  skip_before_action :require_login, only: [:index, :show]
+  before_action :set_tag, only: [:show]
+
+  def index
+    @tags = Tag.all
+               .page(params[:page])
+  end
+
+  def show; end
+
+  private
+
+  def set_tag
+    @tag = Tag.find_by(name: params[:id])
+  end
+end

app/models/tag.rb

@@ -4,4 +4,8 @@ class Tag < ApplicationRecord
   validates :name, presence: true
   has_many :microposts_tags
   has_many :microposts, through: :microposts_tags
+
+  def to_param
+    name
+  end
 end

app/views/microposts/_micropost.html.erb

@@ -4,7 +4,7 @@
     <h5>Tags:</h5>
     <ul id="micropost-<%= micropost.id %>-tags" class="micropost-tags">
       <% micropost.tags.each do |tag| %>
-        <li><%= tag.name %></li>
+        <li><%= link_to tag.name, tag %></li>
       <% end %>
     </ul>
   <% end %>

app/views/tags/index.html.erb

@@ -0,0 +1,12 @@
+<h2><%= t(".tags") %></h2>
+
+<% if @tags.empty? %>
+  <p><%= t(".empty") %></p>
+<% else %>
+  <ul id="tags">
+    <% @tags.each do |tag| %>
+      <li><%= link_to tag.name, tag %></li>
+    <% end %>
+  </ul>
+  <%= paginate @tags %>
+<% end %>

app/views/tags/show.html.erb

@@ -0,0 +1,3 @@
+<h2><%= @tag.name %></h2>
+
+<%= render @tag.microposts %>

config/locales/views/tags/en.yml

@@ -0,0 +1,6 @@
+en:
+  tags:
+    index:
+      tags: Tags
+      empty: You don’t have any tags yet
+

config/routes.rb

@@ -14,4 +14,5 @@ Rails.application.routes.draw do
 
   resources :blog_posts
   resources :microposts
+  resources :tags, only: [:index, :show]
 end