Asymmetrik/mean2-starter

'use strict';

/**
 * Get unique error field name
 */
var getUniqueErrorMessage = function(err) {
    var output;

    try {
        var fieldName = err.err.substring(err.err.lastIndexOf('.$') + 2, err.err.lastIndexOf('_1'));
        output = fieldName.charAt(0).toUpperCase() + fieldName.slice(1) + ' already exists';

    } catch(ex) {
        output = 'Unique field already exists';
    }

    return output;
};

/**
 * Get the error message from error object
 */
module.exports.getErrorMessage = function(err) {
    var message = '';

    if (null == err || typeof err === 'string') {
        message = err;
    } else if (err.code) {
        switch (err.code) {
            case 11000:
            case 11001:
                message = getUniqueErrorMessage(err);
                break;
            default:
                message = 'Something went wrong';
        }
    } else if(err.errors) {
        var linebreak = '\n';

        for (var errName in err.errors) {
            if (err.errors[errName].message) {
                message += err.errors[errName].message + linebreak;
            }
        }

        if (message.indexOf(linebreak, message.length - linebreak.length) !== -1) {
            message = message.substr(0, message.length - linebreak.length);
        }
    } else {
        message = 'Unknown error';
    }

    return message;
};