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class AddIndexesForUserActivityQueries < ActiveRecord::Migration
include Gitlab::Database::MigrationHelpers
DOWNTIME = false
disable_ddl_transaction!
def up
add_concurrent_index :events, [:author_id, :project_id] unless index_exists?(:events, [:author_id, :project_id])
add_concurrent_index :user_interacted_projects, :user_id unless index_exists?(:user_interacted_projects, :user_id)
end
def down
remove_concurrent_index :events, [:author_id, :project_id] if index_exists?(:events, [:author_id, :project_id])
patch_foreign_keys do
remove_concurrent_index :user_interacted_projects, :user_id if index_exists?(:user_interacted_projects, :user_id)
end
end
private
def patch_foreign_keys
return yield if Gitlab::Database.postgresql?
# MySQL doesn't like to remove the index with a foreign key using it.
remove_foreign_key :user_interacted_projects, :users if fk_exists?(:user_interacted_projects, :user_id)
yield
# Let's re-add the foreign key using the existing index on (user_id, project_id)
add_concurrent_foreign_key :user_interacted_projects, :users, column: :user_id unless fk_exists?(:user_interacted_projects, :user_id)
end
def fk_exists?(table, column)
foreign_keys(table).any? do |key|
key.options[:column] == column.to_s
end
end
end
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