discourse/lib/migration/column_dropper.rb

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# frozen_string_literal: true
require_dependency 'migration/base_dropper'
module Migration
class ColumnDropper
def self.mark_readonly(table_name, column_name)
BaseDropper.create_readonly_function(table_name, column_name)
DB.exec <<~SQL
CREATE TRIGGER #{BaseDropper.readonly_trigger_name(table_name, column_name)}
BEFORE INSERT OR UPDATE OF #{column_name}
ON #{table_name}
FOR EACH ROW
WHEN (NEW.#{column_name} IS NOT NULL)
EXECUTE PROCEDURE #{BaseDropper.readonly_function_name(table_name, column_name)};
SQL
end
def self.execute_drop(table, columns)
table = table.to_s
columns.each do |column|
column = column.to_s
self.drop_readonly(table, column)
# safe cause it is protected on method entry, can not be passed in params
DB.exec("ALTER TABLE #{table} DROP COLUMN IF EXISTS #{column}")
end
end
def self.drop_readonly(table, column)
DB.exec <<~SQL
DROP FUNCTION IF EXISTS #{BaseDropper.readonly_function_name(table, column)} CASCADE;
-- Backward compatibility for old functions created in the public
-- schema
DROP FUNCTION IF EXISTS #{BaseDropper.old_readonly_function_name(table, column)} CASCADE;
SQL
end
end
end