CODEWITHSUNDEEP
grailsenumsgsp
drago
drago

Reputation: 1207

Grails g:select no selection

I have the following combobox: 

<g:select name="ticketType" from="${app.domain.enums.TicketType?.values()}"
                              keys="${app.domain.enums.TicketType.values() }"
                              value="${ticketInstance?.ticketType}"
                              noSelection="${['null': 'Select One...']}"
                    />

I've setup the following constraint for ticketType in command object

ticketType nullable: true, blank:true

TicketType is a very simple enum:

    public enum TicketType {
        QUESTION, SUPPORT, MAINTENANCE, NEW_FUNCTIONALITY, MALFUNCTION
}

And every time I don't setup some value for ticketType in my GSP I get the following error:

Failed to convert property value of type 'java.lang.String' to required type 'com.coming.enums.TicketPriority'

It's like in case of no selection g:select sets the value for "null" (string).

What am I missing?

Upvotes: 8

Views: 9573

Answers (3)

Nathan Crause
Nathan Crause

Reputation: 943

Under Rails 3.3.x, no variation of providing the "null" value worked. In the end, I resolved it by adding this line in to the controller+action before doing any use of the params:

// convert "null" strings to REAL nulls
params.account.each { it.value = (it.value == 'null' ? null : it.value) }

After that, the following worked fine:

account.properties = params.account

Upvotes: 0

Aquatoad
Aquatoad

Reputation: 788

Rather than using the 'null' literal, have you tried using an empty string as your noSelection attribute? e.g. noSelection="${['':'Select One...']}"? This may do a proper conversion to a true null value during data binding.

Upvotes: 17

aiolos
aiolos

Reputation: 4697

As your error says - you do have a string in your noSelection. This can't be converted to any of your enum values.

Remove the quotation marks of your null and it should work (it works for me with grails 2.0):

<g:select name="ticketType" from="${app.domain.enums.TicketType?.values()}"
                          keys="${app.domain.enums.TicketType.values() }"
                          value="${ticketInstance?.ticketType}"
                          noSelection="${[null: 'Select One...']}"/>

Upvotes: 2

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