20 lines
614 B
Ruby
20 lines
614 B
Ruby
CONFLICTS_VIEW_SQL = <<EOS
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CREATE VIEW "conflicts" AS
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SELECT "left"."talk_id" AS left, "right"."talk_id" AS right, COUNT(*) AS "conflicts"
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FROM "selected_talks" AS "left"
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INNER JOIN "selected_talks" AS "right"
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ON "left"."talk_preference_id" = "right"."talk_preference_id"
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WHERE "left"."talk_id" != "right"."talk_id"
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GROUP BY "left"."talk_id", "right"."talk_id";
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EOS
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class AddConflictsView < ActiveRecord::Migration[5.0]
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def up
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execute CONFLICTS_VIEW_SQL
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end
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def down
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execute 'DROP VIEW "conflicts"'
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end
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end
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