mastodon/db/migrate/20170119214911_create_preview_cards.rb

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class CreatePreviewCards < ActiveRecord::Migration[5.0]
def change
create_table :preview_cards do |t|
t.integer :status_id
t.string :url, null: false, default: ''
# OpenGraph
t.string :title, null: true
t.string :description, null: true
t.attachment :image
t.timestamps
end
add_index :preview_cards, :status_id, unique: true
end
end