PostgreSQL Error Codes about feathers-knex

[bsubedi26]

@adrianolsk, I was also trying to implement mapping db error codes (although for mysql) - Here is the issue (#133).

The approach I took was adding the specific database errors: to the response errors object so that it was returned back to the client:

module.exports = function errorHandler (error) {
  let feathersError = error;
  const { code , errno, sqlMessage } = error;
  const errorsObject = Object.assign({}, { code , errno, sqlMessage });
  ... (rest of the error handler code) ...
}

Then, within the appropriate case statements:

        feathersError = new errors.BadRequest(error, { errors: errorsObject });

This achieves the client error to look like this:

	"name": "BadRequest",
	"message": "insert into `task` (`another_col`, `text`) values ('afssxxsaaxafmA', 'ff') - Duplicate entry 'afssxxsaaxafmA' for key 'task_another_col_unique'",
	"code": 400,
	"className": "bad-request",
	"data": {},
	"errors": { <<== Added to this object (previously it was an empty object)
		"code": "ER_DUP_ENTRY",
		"errno": 1062
	}
}

I was looking through the error-handler.js code, and the way they're detecting postgresql database errors is with this line of code:

  if (typeof error.code === 'string' && error.severity && error.routine) { ... }

You could possibly do something similar to this - taken from Objection.js issues (Vincit/objection.js#117) - which also uses knex.js:

function isPostgresError(error) {
  if (!error) { return false; }
  // Just check the existence of a bunch of attributes. There doesn't seem to be an easier way.
  return _.all(['severity', 'code', 'detail', 'internalQuery', 'routine'], function(attr) {
    return _.has(error, attr);
  });
}

[stale]

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