Grails Problem with custom error messages

问题:

I am currently trying to specify custom error messages in grails for the default constraints but so far all I get back is the default error message.

I know that I have to edit the grails-app/i18n/messages.properties file

If I change the following default error codes message, it will correctly display the new error message

default.blank.message=Property [{0}] of class [{1}] cannot be blank

However, this is not what I am trying to do. I need more granular error reporting and have more than one field that can be blank etc. What I would like to be able to do would be, display custom messages for each field in a class

package com.mycompany.myapp

class Test{

 String name
 def constraints = {
 name(nullable:false, blank:false)
 }
}

(following codes appended to end of messages.properties)

test.name.blank=Name cannot be blank
test.name.nullable=Name cannot be nullable

According to the grails documentation this should work correctly, either with or without the package name - className.propertyName.blank

grails.org/doc/latest/ (constraints section) & (section 7.4 - validation & internationalization)

I have tried all comnbinations that I can think of, but it always displays the custom message

I have also tried installing the grails i18n templates plugin

http://www.grails.org/I18n+Templates+Plugin

which generated the error codes automatically for me. I appended the new error codes to the end of the existing messages.properties file but I still get the default error messages.

However, there was something different with the error codes that were generated by the plugin.

instead of the format specified in the grails doc - test.name.null=......, it automatically generated test.name.null.error=Custom Message

I have also tried deleting the default error messages completely, but they are still displayed

If anyone has experienced this issue before, I would appreciate any help that anyone can give me

Thanks in advance

回答1:

put def messageSource (in controller or service)

item.errors?.allErrors?.each{ 
println  messageSource.getMessage(it, null)
};

I also found a good link which explains this better

http://johnrellis.blogspot.com/2010/02/retrieve-grails-domain-errors-from.html

回答2:

Well, the documentation shows you an example of how to override the messages for one of the default Validation Constraints (blank, nullable, min, max, size, range, etc.). But it fails to tell you to look in the documentation for each Constraint and at the bottom it shows you what propery key to use:

Error Code: className.propertyName.size.toosmall or className.propertyName.size.toobig

for Constraint size http://grails.org/doc/latest/ref/Constraints/size.html

So, for

package com.example
class User {
    String username

    static constraints = {
        username  size:5..15
    }
}

use:

com.example.User.username.size.toosmall=Yo there! too small: [{0}] of class [{1}] with value [{2}] does not fall within the valid size range from [{3}] to [{4}]

com.example.User.username.size.toobig=Yo there! too big: [{0}] of class [{1}] with value [{2}] does not fall within the valid size range from [{3}] to [{4}]

回答3:

It might be that your constraints aren't static - it should be specified as "static constraints = { ..."

Also note that nullable defaults to false so you don't need to specify that.

回答4:

I use fully qualified class names in my messages.properties

com.shareyourlove.User.password.blank=Some custom message

回答5:

This worked for me

com.model.Customer.name.nullable.error = Custom message

instead of

com.model.Customer.name.blank = Custom message