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# frozen_string_literal: true
module Gitlab
module Database
module Migrations
class SwapColumns
delegate :quote_table_name, :quote_column_name, :clear_cache!, to: :@migration_context
def initialize(migration_context:, table:, column1:, column2:)
@migration_context = migration_context
@table = table
@column_name1 = column1
@column_name2 = column2
end
def execute
rename_column(@table, @column_name1, :temp_name_for_renaming)
rename_column(@table, @column_name2, @column_name1)
rename_column(@table, :temp_name_for_renaming, @column_name2)
end
private
# Rails' `rename_column` will rename related indexes
# using a format e.g. `index_{TABLE_NAME}_on_{KEY1}_and_{KEY2}`
# This will break the migration if the formated index name is longer than 63 chars, e.g.
# `index_ci_pipeline_variables_on_pipeline_id_convert_to_bigint_and_key`
# Therefore, we need to duplicate what Rails has done here without the part renaming related indexes
def rename_column(table_name, column_name, column2_name)
clear_cache!
@migration_context.execute <<~SQL
ALTER TABLE #{quote_table_name(table_name)}
RENAME COLUMN #{quote_column_name(column_name)} TO #{quote_column_name(column2_name)}
SQL
end
end
end
end
end
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