From 9de23a15062d2a7e7df6142c9ee4e84b6f7fea09 Mon Sep 17 00:00:00 2001
From: f <f@sutty.nl>
Date: Thu, 2 Jul 2020 10:59:58 -0300
Subject: [PATCH] =?UTF-8?q?filtros=20en=20los=20art=C3=ADculos=20relaciona?=
 =?UTF-8?q?dos=20y=20PostRelation#where?=
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---
 app/models/layout.rb                 |  6 +++++-
 app/models/metadata_related_posts.rb | 12 ++++++++++-
 app/models/post_relation.rb          | 31 +++++++++++++++++++++-------
 3 files changed, 40 insertions(+), 9 deletions(-)

diff --git a/app/models/layout.rb b/app/models/layout.rb
index 43892bec..02f1645b 100644
--- a/app/models/layout.rb
+++ b/app/models/layout.rb
@@ -1,4 +1,8 @@
 # frozen_string_literal: true
 
 # Una plantilla agrupa metadatos que va a tener un artículo
-Layout = Struct.new(:site, :name, :metadata, keyword_init: true)
+Layout = Struct.new(:site, :name, :metadata, keyword_init: true) do
+  def value
+    name.to_s
+  end
+end
diff --git a/app/models/metadata_related_posts.rb b/app/models/metadata_related_posts.rb
index 0ebc8a02..a0c5fba0 100644
--- a/app/models/metadata_related_posts.rb
+++ b/app/models/metadata_related_posts.rb
@@ -5,13 +5,18 @@
 class MetadataRelatedPosts < MetadataArray
   # Genera un Hash de { title | slug => uuid }
   def values
-    @values ||= site.posts(lang: lang).map do |p|
+    @values ||= posts.map do |p|
       { title(p) => p.uuid.value }
     end.inject(:merge)
   end
 
   private
 
+  # Obtiene todos los posts y opcionalmente los filtra
+  def posts
+    @posts ||= site.posts(lang: lang).where(**filter)
+  end
+
   def title(post)
     post.try(:title).try(:value) || post.try(:slug).try(:value)
   end
@@ -20,4 +25,9 @@ class MetadataRelatedPosts < MetadataArray
   def lang
     post.try(:lang).try(:value) || I18n.locale
   end
+
+  # Encuentra el filtro
+  def filter
+    layout.metadata.dig(name, 'filter')&.to_h&.symbolize_keys || {}
+  end
 end
diff --git a/app/models/post_relation.rb b/app/models/post_relation.rb
index 336c8bd8..efc970b5 100644
--- a/app/models/post_relation.rb
+++ b/app/models/post_relation.rb
@@ -69,17 +69,34 @@ class PostRelation < Array
     end
   end
 
-  # Encuentra el primer post por el valor de un atributo
-  # XXX: Acepta cualquier atributo
+  # Encuentra el primer post por el valor de los atributos
+  #
+  # @param [Hash]
+  # @return [Post]
   def find_by(**args)
-    attr = args.first.first
-
-    find_generic do |p|
-      p.attribute?(attr) &&
-        p.public_send(attr).value == args.first.last
+    find_generic do |post|
+      args.map do |attr, value|
+        post.attribute?(attr) &&
+          post.public_send(attr).value == value
+      end.all?
     end
   end
 
+  # Encuentra todos los Post que cumplan las condiciones
+  #
+  # @param [Hash]
+  # @return [PostRelation]
+  def where(**args)
+    return self if args.empty?
+
+    PostRelation[*select do |post|
+      args.map do |attr, value|
+        post.attribute?(attr) &&
+          post.public_send(attr).value == value
+      end.all?
+    end]
+  end
+
   # Intenta guardar todos y devuelve true si pudo
   def save_all(validate: true)
     map do |post|