Gab Social. All are welcome.

db/migrate/20170901141119_truncate_preview_cards.rb

@@ -0,0 +1,30 @@
+class TruncatePreviewCards < ActiveRecord::Migration[5.1]
+  def up
+    rename_table :preview_cards, :deprecated_preview_cards
+
+    create_table :preview_cards do |t|
+      t.string     :url, default: '', null: false, index: { unique: true }
+      t.string     :title, default: '', null: false
+      t.string     :description, default: '', null: false
+      t.attachment :image
+      t.integer    :type, default: 0, null: false
+      t.text       :html, default: '', null: false
+      t.string     :author_name, default: '', null: false
+      t.string     :author_url, default: '', null: false
+      t.string     :provider_name, default: '', null: false
+      t.string     :provider_url, default: '', null: false
+      t.integer    :width, default: 0, null: false
+      t.integer    :height, default: 0, null: false
+      t.timestamps
+    end
+  end
+
+  def down
+    if ActiveRecord::Base.connection.table_exists? 'deprecated_preview_cards'
+      drop_table :preview_cards
+      rename_table :deprecated_preview_cards, :preview_cards
+    else
+      raise ActiveRecord::IrreversibleMigration, 'Previous preview cards table has already been removed'
+    end
+  end
+end