2017-08-17 22:00:37 +05:30
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# 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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2019-01-03 12:48:30 +05:30
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class AddIndicesToIssueAssignees < ActiveRecord::Migration
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2017-08-17 22:00:37 +05:30
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include Gitlab::Database::MigrationHelpers
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# Set this constant to true if this migration requires downtime.
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DOWNTIME = false
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# When a migration requires downtime you **must** uncomment the following
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# constant and define a short and easy to understand explanation as to why the
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# migration requires downtime.
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# DOWNTIME_REASON = ''
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# When using the methods "add_concurrent_index", "remove_concurrent_index" or
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# "add_column_with_default" you must disable the use of transactions
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# as these methods can not run in an existing transaction.
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# When using "add_concurrent_index" or "remove_concurrent_index" methods make sure
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# that either of them is the _only_ method called in the migration,
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# any other changes should go in a separate migration.
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# This ensures that upon failure _only_ the index creation or removing fails
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# and can be retried or reverted easily.
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#
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# To disable transactions uncomment the following line and remove these
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# comments:
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disable_ddl_transaction!
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def up
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add_concurrent_index :issue_assignees, [:issue_id, :user_id], unique: true, name: 'index_issue_assignees_on_issue_id_and_user_id'
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add_concurrent_index :issue_assignees, :user_id, name: 'index_issue_assignees_on_user_id'
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add_concurrent_foreign_key :issue_assignees, :users, column: :user_id, on_delete: :cascade
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add_concurrent_foreign_key :issue_assignees, :issues, column: :issue_id, on_delete: :cascade
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end
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def down
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remove_foreign_key :issue_assignees, column: :user_id
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remove_foreign_key :issue_assignees, column: :issue_id
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remove_concurrent_index :issue_assignees, [:issue_id, :user_id] if index_exists?(:issue_assignees, [:issue_id, :user_id])
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remove_concurrent_index :issue_assignees, :user_id if index_exists?(:issue_assignees, :user_id)
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end
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end
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