ActiveRecord::StatementInvalid: PG::UndefinedTable: ERROR: relation "#{table_name}" does not exist

事象

こんなエラーが出てきた

     ActiveRecord::StatementInvalid:
       PG::UndefinedTable: ERROR:  relation "#{table_name}" does not exist
       LINE 8:                WHERE a.attrelid = '"#{table_name}"'::...
                                                 ^
       :               SELECT a.attname, format_type(a.atttypid, a.atttypmod),
                            pg_get_expr(d.adbin, d.adrelid), a.attnotnull, a.atttypid, a.atttypmod,
                            c.collname, col_description(a.attrelid, a.attnum) AS comment
                       FROM pg_attribute a
                       LEFT JOIN pg_attrdef d ON a.attrelid = d.adrelid AND a.attnum = d.adnum
                       LEFT JOIN pg_type t ON a.atttypid = t.oid
                       LEFT JOIN pg_collation c ON a.attcollation = c.oid AND a.attcollation <> t.typcollation
                      WHERE a.attrelid = '"#{table_name}"'::regclass
                        AND a.attnum > 0 AND NOT a.attisdropped
                      ORDER BY a.attnum

解決方法

migrationファイルが消えているので作り直す