10 lines
		
	
	
	
		
			286 B
		
	
	
	
		
			Ruby
		
	
	
	
	
	
		
		
			
		
	
	
			10 lines
		
	
	
	
		
			286 B
		
	
	
	
		
			Ruby
		
	
	
	
	
	
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								class CreateInstances < ActiveRecord::Migration[5.2]
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								  def change
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								    create_view :instances, materialized: true
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								    # To be able to refresh the view concurrently,
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								    # at least one unique index is required
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								    safety_assured { add_index :instances, :domain, unique: true }
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								  end
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								end
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