Partial caching

app/controllers/tweets_controller.rb

@@ -1,6 +1,6 @@
 class TweetsController < ApplicationController
   skip_forgery_protection only: %i[track receive_metrics]  # Skip CSRF protection for Tampermonkey POST requests
-  caches_action :index, :show, expires_in: 5.minutes
+  caches_action :show, expires_in: 5.minutes
   before_action :authenticate_user!, only: %i[new create track]
 
   def index
@@ -37,7 +37,6 @@ def create
     @tweet = current_user.tweets.new(create_tweet_params)
 
     if @tweet.save
-      expire_action action: :index
       redirect_to @tweet
     else
       respond_to do |format|
@@ -55,8 +54,7 @@ def receive_metrics
 
     tweet.update!(tweet_params.except(:uuid)) if tweet_params[:body].present?
 
-    if tweet.tweet_metrics.count < 10
-      expire_action action: :index
+    if tweet.tweet_metrics.count < 50
       expire_action action: :show, id: tweet.id
     end
 

app/models/tweet_metric.rb

@@ -24,6 +24,6 @@
 #  fk_rails_...  (user_id => users.id)
 #
 class TweetMetric < ApplicationRecord
-  belongs_to :tweet
+  belongs_to :tweet, touch: true
   belongs_to :user
 end

app/views/tweets/_combined_chart_tweet.html.slim

@@ -0,0 +1,22 @@
+.card
+  .card-content
+    .media
+      .media-left
+        figure class="image is-48x48"
+          img src="#{tweet.author_avatar_url}" class="is-rounded"
+      .media-content
+        p class="title is-4"
+          = link_to tweet.author_name, tweet.author_url, target: "_blank"
+        p class="subtitle is-6"
+          = tweet.body&.truncate(280)
+    .content
+      = tweet.combined_chart
+  footer.card-footer
+    = link_to tweet_path(tweet), class: "card-footer-item primary" do
+      span View Metrics
+      span.icon
+        i class="fa fa-chart-line"
+    = link_to tweet.url, class: "card-footer-item", target: "_blank" do
+      span View Tweet
+      span.icon
+        i class="fa fa-twitter"

app/views/tweets/_tweet_card.html.slim

@@ -0,0 +1,24 @@
+.column.is-3.is-flex.is-flex-direction-column
+  .card.is-flex.is-flex-direction-column.is-flex-grow-1
+    .card-content.is-flex.is-flex-direction-column.is-flex-grow-1
+      .media
+        .media-left
+          figure class="image is-48x48"
+            img src="#{tweet.author_avatar_url}" class="is-rounded"
+        .media-content
+          .title.is-4
+            = link_to tweet.author_name, tweet.url, target: "_blank"
+      .content
+        .field.is-grouped.is-grouped-multiline.mb-1
+          .control
+            = tweet.status_tag
+        = tweet.body&.truncate(280)
+    .card-footer
+      = link_to tweet_path(tweet), class: "card-footer-item primary" do
+        span View Metrics
+        span.icon
+          i class="fa fa-chart-line"
+      = link_to tweet.url, class: "card-footer-item", target: "_blank" do
+        span View Tweet
+        span.icon
+          i class="fa fa-twitter"

app/views/tweets/index.html.slim

@@ -10,56 +10,10 @@ section.hero.is-info
     .column.is-10
       .section
         = link_to 'Add Tweet', new_tweet_path, class: 'button is-primary is-fullwidth is-large'
-      - @tweets.each do |tweet|
-          .card
-            .card-content
-              .media
-                .media-left
-                  figure class="image is-48x48"
-                    img src="#{tweet.author_avatar_url}" class="is-rounded"
-                .media-content
-                  p class="title is-4"
-                    = link_to tweet.author_name, tweet.author_url, target: "_blank"
-                  p class="subtitle is-6"
-                    = tweet.body&.truncate(280)
-              .content
-                = tweet.combined_chart
-            footer.card-footer
-              = link_to tweet_path(tweet), class: "card-footer-item primary" do
-                span View Metrics
-                span.icon
-                  i class="fa fa-chart-line"
-              = link_to tweet.url, class: "card-footer-item", target: "_blank" do
-                span View Tweet
-                span.icon
-                  i class="fa fa-twitter"
+      = render partial: "combined_chart_tweet", collection: @tweets, as: :tweet, cached: true
     .column.is-1
   / Display other tweets as cards
   .columns.is-centered
     .column.is-10
       .columns.is-centered.is-multiline
-        - @other_tweets.each do |tweet|
-          .column.is-3.is-flex.is-flex-direction-column
-            .card.is-flex.is-flex-direction-column.is-flex-grow-1
-              .card-content.is-flex.is-flex-direction-column.is-flex-grow-1
-                .media
-                  .media-left
-                    figure class="image is-48x48"
-                      img src="#{tweet.author_avatar_url}" class="is-rounded"
-                  .media-content
-                    .title.is-4
-                      = link_to tweet.author_name, tweet.url, target: "_blank"
-                .content
-                  .field.is-grouped.is-grouped-multiline.mb-1
-                    .control
-                      = tweet.status_tag
-                  = tweet.body&.truncate(280)
-              .card-footer
-                = link_to tweet_path(tweet), class: "card-footer-item primary" do
-                  span View Metrics
-                  span.icon
-                    i class="fa fa-chart-line"
-                = link_to tweet.url, class: "card-footer-item", target: "_blank" do
-                  span View Tweet
-                  span.icon
-                    i class="fa fa-twitter"
+        = render partial: "tweet_card", collection: @other_tweets, as: :tweet

spec/models/tweet_metric_spec.rb

@@ -32,6 +32,14 @@
       expect(association.macro).to eq(:belongs_to)
     end
 
+    it "touches the tweet" do
+      tweet = create(:tweet, created_at: 1.hour.ago, updated_at: 1.hour.ago)
+
+      expect {
+        create(:tweet_metric, tweet: tweet)
+      }.to change { tweet.updated_at }
+    end
+
     it "belongs to a user" do
       association = described_class.reflect_on_association(:user)
       expect(association.macro).to eq(:belongs_to)