Question

Improving my example on how to use the metadata obtained to create validation rules in knockout (http://stackoverflow.com/questions/13662446/knockout-validation-using-breeze-utility) now I use the validators that breeze inserts into the entities:

function addValidationRules(entity) {
    var entityType = entity.entityType;
    console.log(entityType);
    if (entityType) {
        for (var i = 0; i < entityType.dataProperties.length; i++) {
            var property = entityType.dataProperties[i];
            var propertyName = property.name;
            var propertyObject = entity[propertyName];

            var validators = [];
            for (var u = 0; u < property.validators.length; u++) {
                var validator = property.validators[u];
                var nValidator = {
                    propertyName: propertyName,
                    validator: function (val, other) {
                        var error = this.innerValidator.validate(val, { displayName: this.propertyName });
                        this.message = error ? error.errorMessage : "";
                        return error === null;
                    },
                    message: "",
                    innerValidator: validator
                }
                validators.push(nValidator);
            }
            propertyObject.extend({
                validation: validators
            });
        }

        for (var i = 0; i < entityType.foreignKeyProperties.length; i++) {
            var property = entityType.foreignKeyProperties[i];
            var propertyName = property.name;
            var propertyObject = entity[propertyName];

            var validators = [];
            for (var u = 0; u < property.validators.length; u++) {
                var validator = property.validators[u];
                var nValidator = {
                    propertyName: propertyName,
                    validator: function (val, other) {
                        var error = this.innerValidator.validate(val, { displayName: this.propertyName });
                        this.message = error ? error.errorMessage : "";
                        return error === null;
                    },
                    message: "",
                    innerValidator: validator
                }
                validators.push(nValidator);
            }
            propertyObject.extend({
                validation: validators
            });
            if (!property.isNullable) {
                //Bussiness Rule: 0 is not allowed for required foreign keys
                propertyObject.extend({ notEqual: foreignKeyInvalidValue });
            }
        }
    }
};

What I need now is to translate the error messages into my language and I was wondering if it would be possible to include a function to breeze similar to the included in knockout-validation to translate messages:

//quick function to override rule messages
ko.validation.localize = function (msgTranslations) {

    var msg, rule;

    //loop the properties in the object and assign the msg to the rule
    for (rule in msgTranslations) {
        if (ko.validation.rules.hasOwnProperty(rule)) {
            ko.validation.rules[rule].message = msgTranslations[rule];
        }
    }
};
//#endregion

Answer 1

This is a good idea. Please add it to the Breeze User Voice ( and vote for it). We take these suggestions very seriously.

There is another approach for the short term. You can replace any of the

Validator.messageTemplates

with your own messages. Validator.messageTemplates is a configuration object keyed by the name of the validator where the value is a parameterized version of the error message.

We do need to document this better.