Add batch approve/reject for pending hashtags in admin UI (#11791)

app/models/form/tag_batch.rb

@@ -0,0 +1,33 @@
+# frozen_string_literal: true
+
+class Form::TagBatch
+  include ActiveModel::Model
+  include Authorization
+
+  attr_accessor :tag_ids, :action, :current_account
+
+  def save
+    case action
+    when 'approve'
+      approve!
+    when 'reject'
+      reject!
+    end
+  end
+
+  private
+
+  def tags
+    Tag.where(id: tag_ids)
+  end
+
+  def approve!
+    tags.each { |tag| authorize(tag, :update?) }
+    tags.update_all(trendable: true, reviewed_at: Time.now.utc)
+  end
+
+  def reject!
+    tags.each { |tag| authorize(tag, :update?) }
+    tags.update_all(trendable: false, reviewed_at: Time.now.utc)
+  end
+end