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class UpdateFollowRecommendationsToVersion2 < ActiveRecord::Migration[6.1]
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# We're switching from a normal to a materialized view so we need
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# custom `up` and `down` paths.
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def up
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drop_view :follow_recommendations
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create_view :follow_recommendations, version: 2, materialized: { no_data: 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 :follow_recommendations, :account_id, unique: true }
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end
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def down
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drop_view :follow_recommendations, materialized: true
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create_view :follow_recommendations, version: 1
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end
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end
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