Add reading time to reading list (forem#2929)

* init

- add reading_time to reactions
- make migration
- add to algolia index in reaction model
- add method in reaction model to define reading time based on reactable reading time

* add time to front end

* Revert "Return errors instead of raising an exception on ArticleCreation (forem#2922)"

This reverts commit 09a99d9.

* Revert "init"

This reverts commit 53650eb.

* Revert "Revert "Return errors instead of raising an exception on ArticleCreation (forem#2922)""

This reverts commit e8cf1f3.

* Update reaction.rb

* remove duplicate searchableAttribute

app/javascript/readingList/readingList.jsx

@@ -128,7 +128,8 @@ export class ReadingList extends Component {
                 src={item.reactable_user.profile_image_90}
                 alt="Profile Pic"
               />
-              {item.reactable_user.name}・{item.reactable_published_date}
+              {item.reactable_user.name}・{item.reactable_published_date}・
+              {item.reading_time} min read・
             </a>
             <span className="readinglist-item-tag-collection">
               {item.reactable_tags.map(tag => (

app/models/reaction.rb

@@ -25,10 +25,10 @@ class Reaction < ApplicationRecord
   before_destroy :remove_algolia
 
   algoliasearch index_name: "SecuredReactions_#{Rails.env}", auto_index: false, auto_remove: false do
-    attribute :id, :reactable_user, :searchable_reactable_title, :searchable_reactable_path, :status,
+    attribute :id, :reactable_user, :searchable_reactable_title, :searchable_reactable_path, :status, :reading_time,
               :searchable_reactable_text, :searchable_reactable_tags, :viewable_by, :reactable_tags, :reactable_published_date
     searchableAttributes %i[searchable_reactable_title searchable_reactable_text
-                            searchable_reactable_text searchable_reactable_tags reactable_user]
+                            searchable_reactable_tags reactable_user]
     tags do
       reactable_tags
     end
@@ -105,6 +105,10 @@ def update_reactable_without_delay
     Reactions::UpdateReactableJob.perform_now(id)
   end
 
+  def reading_time
+    reactable.reading_time if category == "readinglist"
+  end
+
   def remove_from_index
     remove_from_index!
   end