19 lines
		
	
	
	
		
			477 B
		
	
	
	
		
			Ruby
		
	
	
	
	
	
		
		
			
		
	
	
			19 lines
		
	
	
	
		
			477 B
		
	
	
	
		
			Ruby
		
	
	
	
	
	
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								require Rails.root.join('lib', 'mastodon', 'migration_helpers')
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								class AddEmbedUrlToPreviewCards < ActiveRecord::Migration[5.1]
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								  include Mastodon::MigrationHelpers
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								  disable_ddl_transaction!
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								  def up
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								    safety_assured do
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								      add_column_with_default :preview_cards, :embed_url, :string, default: '', allow_null: false
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								    end
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								  end
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								  def down
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								    execute "UPDATE preview_cards SET url=embed_url WHERE embed_url!=''"
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								    remove_column :preview_cards, :embed_url
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								  end
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								end
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