如何在Grails中自定义选择标签

Question

I have this hasMany relation, between a client and a product. When I generate the views and controllers, in the create view of the product I can chose a client. By default Grails displays a select containing only the id of the clients. How can I change that? For example I want to show only the name of the client instead of the id.

I'm using Grails 3.3, Here is the domain code:

client.groovy :

class client {
    String FirstName
    String LastName

    static hasMany = [products: Product]
}

product.groovy :

class product {
    String Name
    int Price
    Client c

    static belongsTo = Client
}

Answer 1

I believe that the default generated select list will use the toString() method of the object as the display value for each <option> and the id for the key value. The easiest way to change the default display would be to override toString() in your product class:

@Override
String toString() {
  name
}

Answer 2

You can customize how the select looks like by specifying optionKey and optionValue attributes:

<g:select from="${Client.list()}" name="client" optionKey="FirstName" optionValue="id" />

See the ref doc for details.

If you need to do something fancier, like show first AND last name, then you could pre-process the list a bit:

<g:select from="${Client.list().collect{ [ id:it.id, name:it.firstName + ' ' + it.lastName ] }}" name="client" optionKey="name" optionValue="id" />