Adding more counter caches

app/models/comment.rb

@@ -2,7 +2,7 @@
 
 class Comment < ApplicationRecord
   belongs_to :author, class_name: 'Member', inverse_of: :comments
-  belongs_to :post
+  belongs_to :post, counter_cache: true
 
   scope :post_order, -> { reorder("created_at ASC") } # for display on post page
 

app/models/harvest.rb

@@ -35,8 +35,8 @@ class Harvest < ApplicationRecord
 
   ##
   ## Relationships
-  belongs_to :crop
-  belongs_to :plant_part
+  belongs_to :crop, counter_cache: true
+  belongs_to :plant_part, counter_cache: true
   belongs_to :planting, optional: true, counter_cache: true
 
   ##

app/models/like.rb

@@ -2,7 +2,7 @@
 
 class Like < ApplicationRecord
   belongs_to :member
-  belongs_to :likeable, polymorphic: true, counter_cache: true
+  belongs_to :likeable, polymorphic: true, counter_cache: true, touch: true
   validates :member, :likeable, presence: true
   validates :member, uniqueness: { scope: :likeable }
 end

app/models/photo.rb

@@ -7,7 +7,7 @@ class Photo < ApplicationRecord
   PHOTO_CAPABLE = %w(Garden Planting Harvest Seed Post Crop).freeze
 
   has_many :photo_associations, foreign_key: :photo_id, dependent: :delete_all, inverse_of: :photo
-  has_many :crops, through: :photo_associations
+  has_many :crops, through: :photo_associations, counter_cache: true
 
   validates :fullsize_url, url: true
   validates :thumbnail_url, url: true

app/models/photo_association.rb

@@ -2,8 +2,8 @@
 
 class PhotoAssociation < ApplicationRecord
   belongs_to :photo, inverse_of: :photo_associations
-  belongs_to :photographable, polymorphic: true
-  belongs_to :crop, optional: true
+  belongs_to :photographable, polymorphic: true, touch: true
+  belongs_to :crop, optional: true, counter_cache: true
 
   validate :photo_and_item_have_same_owner
 

db/migrate/20191226024813_crop_harvest_counter_cache.rb

@@ -0,0 +1,20 @@
+class CropHarvestCounterCache < ActiveRecord::Migration[5.2]
+  def change
+    change_table :crops do |t|
+      t.integer :harvests_count, default: 0
+    end
+    reversible do |dir|
+      dir.up { set_counter_value }
+    end
+  end
+  def set_counter_value
+    execute <<-SQL.squish
+        UPDATE crops
+           SET harvests_count = (
+             SELECT count(1)
+               FROM harvests
+              WHERE harvests.crop_id = crops.id
+              )
+    SQL
+  end
+end

db/migrate/20191226024957_crop_photo_counter_cache.rb

@@ -0,0 +1,20 @@
+class CropPhotoCounterCache < ActiveRecord::Migration[5.2]
+  def change
+    change_table :crops do |t|
+      t.integer :photo_associations_count, default: 0
+    end
+    reversible do |dir|
+      dir.up { set_counter_value }
+    end
+  end
+  def set_counter_value
+    execute <<-SQL.squish
+        UPDATE crops
+           SET photo_associations_count = (
+             SELECT count(1)
+               FROM photo_associations
+              WHERE photo_associations.crop_id = crops.id
+              )
+    SQL
+  end
+end

db/migrate/20191226025124_plant_part_harvest_counter_cache.rb

@@ -0,0 +1,23 @@
+# frozen_string_literal: true
+
+class PlantPartHarvestCounterCache < ActiveRecord::Migration[5.2]
+  def change
+    change_table :plant_parts do |t|
+      t.integer :harvests_count, default: 0
+    end
+    reversible do |dir|
+      dir.up { set_counter_value }
+    end
+  end
+
+  def set_counter_value
+    execute <<-SQL.squish
+        UPDATE plant_parts
+           SET harvests_count = (
+             SELECT count(1)
+               FROM harvests
+              WHERE harvests.plant_part_id = plant_parts.id
+              )
+    SQL
+  end
+end

db/migrate/20191226025225_post_comment_counter_cache.rb

@@ -0,0 +1,23 @@
+# frozen_string_literal: true
+
+class PostCommentCounterCache < ActiveRecord::Migration[5.2]
+  def change
+    change_table :posts do |t|
+      t.integer :comments_count, default: 0
+    end
+    reversible do |dir|
+      dir.up { set_counter_value }
+    end
+  end
+
+  def set_counter_value
+    execute <<-SQL.squish
+      UPDATE posts
+         SET comments_count = (
+           SELECT count(1)
+             FROM comments
+            WHERE comments.post_id = posts.id
+            )
+    SQL
+  end
+end

db/schema.rb

@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 2019_11_19_030244) do
+ActiveRecord::Schema.define(version: 2019_12_26_025225) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
@@ -196,6 +196,8 @@ ActiveRecord::Schema.define(version: 2019_11_19_030244) do
     t.integer "median_days_to_first_harvest"
     t.integer "median_days_to_last_harvest"
     t.jsonb "openfarm_data"
+    t.integer "harvests_count", default: 0
+    t.integer "photo_associations_count", default: 0
     t.index ["name"], name: "index_crops_on_name"
     t.index ["requester_id"], name: "index_crops_on_requester_id"
     t.index ["slug"], name: "index_crops_on_slug", unique: true
@@ -458,6 +460,7 @@ ActiveRecord::Schema.define(version: 2019_11_19_030244) do
     t.datetime "created_at"
     t.datetime "updated_at"
     t.string "slug"
+    t.integer "harvests_count", default: 0
   end
 
   create_table "plantings", id: :serial, force: :cascade do |t|
@@ -491,6 +494,7 @@ ActiveRecord::Schema.define(version: 2019_11_19_030244) do
     t.string "slug"
     t.integer "forum_id"
     t.integer "likes_count", default: 0
+    t.integer "comments_count", default: 0
     t.index ["created_at", "author_id"], name: "index_posts_on_created_at_and_author_id"
     t.index ["slug"], name: "index_posts_on_slug", unique: true
   end