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Diffstat (limited to 'lib/gitlab/background_migration/copy_column.rb')
| -rw-r--r-- | lib/gitlab/background_migration/copy_column.rb | 41 |
1 files changed, 0 insertions, 41 deletions
diff --git a/lib/gitlab/background_migration/copy_column.rb b/lib/gitlab/background_migration/copy_column.rb deleted file mode 100644 index ef70f37d5eb..00000000000 --- a/lib/gitlab/background_migration/copy_column.rb +++ /dev/null @@ -1,41 +0,0 @@ -# frozen_string_literal: true - -module Gitlab - module BackgroundMigration - # CopyColumn is a simple (reusable) background migration that can be used to - # update the value of a column based on the value of another column in the - # same table. - # - # For this background migration to work the table that is migrated _has_ to - # have an `id` column as the primary key. - class CopyColumn - # table - The name of the table that contains the columns. - # copy_from - The column containing the data to copy. - # copy_to - The column to copy the data to. - # start_id - The start ID of the range of rows to update. - # end_id - The end ID of the range of rows to update. - def perform(table, copy_from, copy_to, start_id, end_id) - return unless connection.column_exists?(table, copy_to) - - quoted_table = connection.quote_table_name(table) - quoted_copy_from = connection.quote_column_name(copy_from) - quoted_copy_to = connection.quote_column_name(copy_to) - - # We're using raw SQL here since this job may be frequently executed. As - # a result dynamically defining models would lead to many unnecessary - # schema information queries. - connection.execute <<-SQL.strip_heredoc - UPDATE #{quoted_table} - SET #{quoted_copy_to} = #{quoted_copy_from} - WHERE id BETWEEN #{start_id} AND #{end_id} - AND #{quoted_copy_from} IS NOT NULL - AND #{quoted_copy_to} IS NULL - SQL - end - - def connection - ActiveRecord::Base.connection - end - end - end -end |