30 lines
912 B
Ruby
30 lines
912 B
Ruby
# See http://doc.gitlab.com/ce/development/migration_style_guide.html
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# for more information on how to write migrations for GitLab.
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class RemoveDuplicatesFromRoutes < ActiveRecord::Migration[4.2]
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include Gitlab::Database::MigrationHelpers
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DOWNTIME = false
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def up
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# We can skip this migration when running a PostgreSQL database because
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# we use an optimized query in the "FillProjectsRoutesTable" migration
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# to fill these values that avoid duplicate entries in the routes table.
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return unless Gitlab::Database.mysql?
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execute <<-EOF
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DELETE duplicated_rows.*
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FROM routes AS duplicated_rows
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INNER JOIN (
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SELECT path, MAX(id) as max_id
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FROM routes
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GROUP BY path
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HAVING COUNT(*) > 1
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) AS good_rows ON good_rows.path = duplicated_rows.path AND good_rows.max_id <> duplicated_rows.id;
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EOF
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end
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def down
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end
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end
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