Show the local couterpart of emoji when it exists in /admin/custom_emojis (#5467)

* Show the local couterpart of emoji when it exists in admin/custom_emojis

* Fix indentation

* Fix error

* Add class table-action-link to Overwrite link

* Make it enable to overwrite emojis

* Make Code Climate happy

4 files changed, 14 insertions, 5 deletions

diff --git a/app/controllers/admin/custom_emojis_controller.rb b/app/controllers/admin/custom_emojis_controller.rb
index cbd7abe95..daa1460fb 100644
--- a/app/controllers/admin/custom_emojis_controller.rb
+++ b/app/controllers/admin/custom_emojis_controller.rb
@@ -5,7 +5,7 @@ module Admin
     before_action :set_custom_emoji, except: [:index, :new, :create]
 
     def index
-      @custom_emojis = filtered_custom_emojis.page(params[:page])
+      @custom_emojis = filtered_custom_emojis.eager_load(:local_counterpart).page(params[:page])
     end
 
     def new
@@ -36,9 +36,9 @@ module Admin
     end
 
     def copy
-      emoji = CustomEmoji.new(domain: nil, shortcode: @custom_emoji.shortcode, image: @custom_emoji.image)
+      emoji = CustomEmoji.find_or_create_by(domain: nil, shortcode: @custom_emoji.shortcode)
 
-      if emoji.save
+      if emoji.update(image: @custom_emoji.image)
         flash[:notice] = I18n.t('admin.custom_emojis.copied_msg')
       else
         flash[:alert] = I18n.t('admin.custom_emojis.copy_failed_msg')
diff --git a/app/helpers/application_helper.rb b/app/helpers/application_helper.rb
index 6d625e7db..310e1b1b1 100644
--- a/app/helpers/application_helper.rb
+++ b/app/helpers/application_helper.rb
@@ -43,6 +43,10 @@ module ApplicationHelper
     content_tag(:i, nil, attributes.merge(class: class_names.join(' ')))
   end
 
+  def custom_emoji_tag(custom_emoji)
+    image_tag(custom_emoji.image.url, class: 'emojione', alt: ":#{custom_emoji.shortcode}:")
+  end
+
   def opengraph(property, content)
     tag(:meta, content: content, property: property)
   end
diff --git a/app/models/custom_emoji.rb b/app/models/custom_emoji.rb
index 28b6a2b0b..a77b53c98 100644
--- a/app/models/custom_emoji.rb
+++ b/app/models/custom_emoji.rb
@@ -25,6 +25,8 @@ class CustomEmoji < ApplicationRecord
     :(#{SHORTCODE_RE_FRAGMENT}):
     (?=[^[:alnum:]:]|$)/x
 
+  has_one :local_counterpart, -> { where(domain: nil) }, class_name: 'CustomEmoji', primary_key: :shortcode, foreign_key: :shortcode
+
   has_attached_file :image, styles: { static: { format: 'png', convert_options: '-coalesce -strip' } }
 
   validates_attachment :image, content_type: { content_type: 'image/png' }, presence: true, size: { in: 0..50.kilobytes }
diff --git a/app/views/admin/custom_emojis/_custom_emoji.html.haml b/app/views/admin/custom_emojis/_custom_emoji.html.haml
index 399d13bbd..bab34bc8d 100644
--- a/app/views/admin/custom_emojis/_custom_emoji.html.haml
+++ b/app/views/admin/custom_emojis/_custom_emoji.html.haml
@@ -1,6 +1,6 @@
 %tr
   %td
-    = image_tag custom_emoji.image.url, class: 'emojione', alt: ":#{custom_emoji.shortcode}:"
+    = custom_emoji_tag(custom_emoji)
   %td
     %samp= ":#{custom_emoji.shortcode}:"
   %td
@@ -15,7 +15,10 @@
       - else
         = table_link_to 'eye-slash', t('admin.custom_emojis.unlisted'), admin_custom_emoji_path(custom_emoji, custom_emoji: { visible_in_picker: true }), method: :patch
     - else
-      = table_link_to 'copy', t('admin.custom_emojis.copy'), copy_admin_custom_emoji_path(custom_emoji, page: params[:page]), method: :post
+      - if custom_emoji.local_counterpart.present?
+        = link_to safe_join([custom_emoji_tag(custom_emoji.local_counterpart), t('admin.custom_emojis.overwrite')]), copy_admin_custom_emoji_path(custom_emoji, page: params[:page]), method: :post, class: 'table-action-link'
+      - else
+        = table_link_to 'copy', t('admin.custom_emojis.copy'), copy_admin_custom_emoji_path(custom_emoji, page: params[:page]), method: :post
   %td
     - if custom_emoji.disabled?
       = table_link_to 'power-off', t('admin.custom_emojis.enable'), enable_admin_custom_emoji_path(custom_emoji), method: :post, data: { confirm: t('admin.accounts.are_you_sure') }