Grails - 如何将 personInstance ID 从 gsp 发送到域类？

Question

I'm a complete newbie in grails and I need you guys' help. I have my sql query in the domain class. I put [1] to see the result but ultimately I'd like to send an argument in that place to display the result according to the person's id number.

def dataSource

def someMethod() {

    def sql = new Sql(dataSource)

    def resultRows = sql.rows('select * from result where id = ?', [1])
}

And this is what I have in my gsp.

<g:each in="${personInstance.someMethod()}" status="i" var="results">
    <tr class="${(i % 2) == 0 ? 'even' : 'odd'}">
        <td>${results.column_1}</td>
        <td>${results.column_2}</td>
        <td>${results.column_3}</td>
    </tr>
</g:each>

How do I send a parameter from view to domain class? Please help.

Thank you in advance.

Answer 1

If you want to see how Grails 'would like' your controller and view code to look, try letting Grails generate the code for you. Even if you don't keep that code in your final project, it is still useful as an instructional tool.

arc$ grails create-app Tester1
arc$ cd Tester1
arc$ grails
grails> create-domain-class Person
-- add some attributes to your Person domain class, save the file
grails> generate-all tester1.Person

Now go look at the PersonController.groovy, and the various views. Basically, it's marshal your data in the controller, pass it to the views, views operate on what they're given.

Very basic example of passing arbitrary data to the gsp:

// show method for an Adventure
def show(Adventure adventure) {
    // a String to pass to the gsp
    def attribute = 'Bilbo'
    // an Array to pass to the gsp
    def attributeList = ['Dwalin','Balin','etc']
    // create a map of values that are 'automagically' passed
    // to the show.gsp
    [adventure: adventure, hobbit: attribute, dwarves: attributeList]
}

The adventure, hobbit, and dwarves variables are all available in the gsp. The template code likes to use verbose naming, like adventureInstance, but as long as your gsp code uses the keynames in the map you define, you're good to go.