#20

backend/app/controllers/posts_controller.rb

@@ -97,6 +97,8 @@ class PostsController < ApplicationController
       tags = Tag.normalise_tags(tag_names)
       tags = Tag.expand_parent_tags(tags)
       sync_post_tags!(post, tags)
+
+      post.reload
       render json: post.as_json(include: { tags: { only: [:id, :category, :post_count],
                                                    methods: [:name, :has_wiki] } }),
              status: :created
@@ -136,6 +138,8 @@ class PostsController < ApplicationController
              Tag.normalise_tags(tag_names, with_tagme: false)
       tags = Tag.expand_parent_tags(tags)
       sync_post_tags!(post, tags)
+
+      post.reload
       json = post.as_json
       json['tags'] = build_tag_tree_for(post.tags)
       render json:, status: :ok
@@ -197,6 +201,8 @@ class PostsController < ApplicationController
   end
 
   def filter_posts_by_tags tag_names, match_type
+    tag_names = TagName.canonicalise(tag_names)
+
     posts = Post.joins(tags: :tag_name)
 
     if match_type == 'any'

backend/app/controllers/tags_controller.rb

@@ -18,13 +18,41 @@ class TagsController < ApplicationController
 
     with_nico = !(params[:nico].to_s.strip.downcase.in?(['0', 'false', 'off', 'no']))
 
-    tags = (Tag.joins(:tag_name).includes(:tag_name)
-            .where(((with_nico ? '(tags.category = ? AND tag_names.name LIKE ?) OR ' : '') +
-                    'tag_names.name LIKE ?'),
-                   *(with_nico ? ['nico', "nico:#{ q }%"] : []), "#{ q }%")
-            .order(Arel.sql('post_count DESC, tag_names.name ASC'))
-            .limit(20))
-    render json: tags.as_json(only: [:id, :category, :post_count], methods: [:name, :has_wiki])
+    alias_rows =
+        TagName
+        .where('name LIKE ?', "#{ q }%")
+        .where.not(canonical_id: nil)
+        .pluck(:canonical_id, :name)
+
+    matched_alias_by_tag_name_id = { }
+    canonical_ids = []
+
+    alias_rows.each do |canonical_id, alias_name|
+      canonical_ids << canonical_id
+      matched_alias_by_tag_name_id[canonical_id] ||= alias_name
+    end
+
+    base = Tag.joins(:tag_name).includes(:tag_name)
+
+    canonical_hit =
+        base
+        .where(((with_nico ? '(tags.category = ? AND tag_names.name LIKE ?) OR ' : '') +
+                'tag_names.name LIKE ?'),
+               *(with_nico ? ['nico', "nico:#{ q }%"] : []), "#{ q }%")
+
+    tags =
+        if canonical_ids.present?
+          canonical_hit.or(base.where(tag_name_id: canonical_ids.uniq))
+        else
+          canonical_hit
+        end
+
+    tags = tags.order(Arel.sql('post_count DESC, tag_names.name')).limit(20).to_a
+
+    render json: tags.map { |tag|
+      tag.as_json(only: [:id, :category, :post_count], methods: [:name, :has_wiki])
+          .merge(matched_alias: matched_alias_by_tag_name_id[tag.tag_name_id])
+    }
   end
 
   def show