how to change constraints errors messange in grails

Question

Hi,

I have domain with constraints like min value must greater than 0

I have no idea how to change the message if the constraints are not passed.

which file i need to edit to do that ?

I also need to display the values some properties as well .. like

"you cannot make any transaction because your balance is less than 100. Your current balance is ${currentBalance} after deducted. Your previous balance is ${previousBalance} and amount that need to be deducted ${deductedValue}"

note my class:

class Transaction
BigDecimal previousBalance
BigDecimal currentBalance
BigDecimal deductedValue ; 

constraints currentBalance(min:100)

beforeUpdate => currentBalance = previousBalance - deductedValue 

Answer 1

Edit your messages.properties file in your grails-app/i18n folder with the messages corresponding with the constraint that was violated. For a plug-in that can help you generate the messages to go along with your constraints see this.

Answer 2

under grails-app/i18n use messages.properties to add your string (or any other locale you're working with).

If you're domain class is called "user" and the field you have is called "balance" class User{ static constraints = { balance(min:100) } BigDecimal balance; }

, then you'd add:

user.balance.min.error.User.balance= you cannot make any transaction because your balance is less than [{3}].Your current balance is [{2}]

Answer 3

The docs give you an understanding of the correct Grails approach to validation error messages.

http://grails.org/doc/1.3.1/guide/7.%20Validation.html#7.4%20Validation%20and%20Internationalization

Also, check out this free ebook, a good introduction to the Grails fundamentals

http://www.infoq.com/minibooks/grails-getting-started

Specifically p28