From d61d1cad565636c800f4f7642c065ad62d99de9d Mon Sep 17 00:00:00 2001
From: f <f@sutty.nl>
Date: Thu, 6 May 2021 19:07:11 -0300
Subject: [PATCH] =?UTF-8?q?respetar=20el=20orden=20de=20los=20art=C3=ADcul?=
 =?UTF-8?q?os?=
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siempre ordenamos primero por número de orden y fecha de creación,
siempre decrecientes.  esto permite que les usuaries prioricen contenido
usando las herramientas de reordenamiento.

pg_search no soporta esto, siempre ordena por cuánto corresponde el
resultado con la búsqueda, así que lo emparchamos para que respete el
orden que necesitamos.

el reporte de error relacionado es este:
https://github.com/Casecommons/pg_search/issues/467
---
 app/models/indexed_post.rb                          |  3 +++
 app/models/post/indexable.rb                        |  2 ++
 config/initializers/core_extensions.rb              | 13 +++++++++++++
 .../20210506212356_add_order_to_indexed_posts.rb    |  9 +++++++++
 db/schema.rb                                        |  3 ++-
 5 files changed, 29 insertions(+), 1 deletion(-)
 create mode 100644 db/migrate/20210506212356_add_order_to_indexed_posts.rb

diff --git a/app/models/indexed_post.rb b/app/models/indexed_post.rb
index 6456a824..c76a5c85 100644
--- a/app/models/indexed_post.rb
+++ b/app/models/indexed_post.rb
@@ -26,6 +26,9 @@ class IndexedPost < ApplicationRecord
       }
     }
 
+  # Trae los IndexedPost en el orden en que van a terminar en el sitio.
+  default_scope lambda { order(order: :desc, created_at: :desc) }
+
   belongs_to :site
 
   # Convertir locale a direccionario de PG
diff --git a/app/models/post/indexable.rb b/app/models/post/indexable.rb
index f25f28d2..9b92111f 100644
--- a/app/models/post/indexable.rb
+++ b/app/models/post/indexable.rb
@@ -18,6 +18,8 @@ class Post
           indexed_post.title = title.value
           indexed_post.front_matter = indexable_front_matter
           indexed_post.content = indexable_content
+          indexed_post.created_at = date.value
+          indexed_post.order = attribute?(:order) ? order.value : 0
         end
       end
 
diff --git a/config/initializers/core_extensions.rb b/config/initializers/core_extensions.rb
index e37b2be4..84dea42e 100644
--- a/config/initializers/core_extensions.rb
+++ b/config/initializers/core_extensions.rb
@@ -66,3 +66,16 @@ module Jekyll
     end
   end
 end
+
+# No aplicar el orden por ranking para poder obtener los artículos en el
+# orden que tendrían en el sitio final.
+module PgSearch
+  ScopeOptions.class_eval do
+    def apply(scope)
+      scope = include_table_aliasing_for_rank(scope)
+      rank_table_alias = scope.pg_search_rank_table_alias(include_counter: true)
+
+      scope.joins(rank_join(rank_table_alias))
+    end
+  end
+end
diff --git a/db/migrate/20210506212356_add_order_to_indexed_posts.rb b/db/migrate/20210506212356_add_order_to_indexed_posts.rb
new file mode 100644
index 00000000..4b1a9fcf
--- /dev/null
+++ b/db/migrate/20210506212356_add_order_to_indexed_posts.rb
@@ -0,0 +1,9 @@
+# frozen_string_literal: true
+
+# Agrega el orden y fecha del post en el post indexado, de forma que los
+# resultados se puedan obtener en el mismo orden.
+class AddOrderToIndexedPosts < ActiveRecord::Migration[6.1]
+  def change
+    add_column :indexed_posts, :order, :integer, default: 0
+  end
+end
diff --git a/db/schema.rb b/db/schema.rb
index fed6934b..ed629401 100644
--- a/db/schema.rb
+++ b/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: 2021_05_04_224343) do
+ActiveRecord::Schema.define(version: 2021_05_06_212356) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "pg_trgm"
@@ -229,6 +229,7 @@ ActiveRecord::Schema.define(version: 2021_05_04_224343) do
     t.jsonb "front_matter", default: "{}"
     t.string "content", default: ""
     t.tsvector "indexed_content"
+    t.integer "order", default: 0
     t.index ["front_matter"], name: "index_indexed_posts_on_front_matter", using: :gin
     t.index ["indexed_content"], name: "index_indexed_posts_on_indexed_content", using: :gin
     t.index ["layout"], name: "index_indexed_posts_on_layout"