I have a problem to use data binding with inherit models. That's my code:
class Member {
int age
static belongsTo = [Family]
static constraints = {}
}
class Parent extends Member {
String name
static constraints = {}
}
class Family {
String name
List members
static hasMany = [members: Member]
static constraints = {}
}
def test(){
def bindingMap = [name: 'toto', members:[[age: 18, name: '1'],[age: 18]]]
def family = new Family()
family.properties = bindingMap
family.save(flush: true)
def get = Family.get(family.id)
// here family only contains Member and no Parent, as expected...
}
With this code, as you can see, I'm not able to create Parent with data binding.
Anyone have an idea?
Thanks
Related
How to get the value as following codes with my show view page on Grails?
Person.groovy
package com
class Person {
String person
static constraints = {
person blank:false,nullable:true
}
static hasMany=[task:Task]
String toString(){return person}
static mapping={
}
}
Task.groovy
package com.moog
class Task {
String task
static constraints = {
task blank:false,nullable:true,unique:true
}
static belongsTo=[person:Person]
static hasMany=[tag:Tag]
String toString(){return task}
}
Tag.groovy
package com
class Tag {
String tag
static constraints = {
tag blank:false, nullable:true
}
static belongsTo=[task:Task]
String toString(){
return tag
}
}
First of all try a better wording for your collections
static hasMany=[tasks:Task] // in Person.groovy
static hasMany=[tags:Tag] // in Task.groovy
In your person show.gsp try something like
<g:each in=${person.tasks} var="task">
<p>${task}</p>
</g:each>
If you do not use scaffolding and write you own controller methods to create your entities than maybe this helps you further:
def task = new Task(task:"Clean room")
def person = Person.get(1)
person.addToTasks(task)
person.save()
For example, I've parent class Author:
class Author {
String name
static hasMany = [
fiction: Book,
nonFiction: Book
]
}
and a child class Book:
class Book {
String title
static belongsTo = [author: Author]
}
I've done some records to Author using:
def fictBook = new Book(title: "IT")
def nonFictBook = new Book(title: "On Writing: A Memoir of the Craft")
def a = new Author(name: "Stephen King")
.addToFiction(fictBook)
.addToNonFiction(nonFictBook)
.save()
How can I found child-class record by parent and parent-class record by child?
In my opinion, this is not the best way to model your data. I would do it like this.
class Author {
String name
static hasMany = [books: Book]
}
class Book {
String title
BookTypes bookType
static belongsTo = [author: Author]
}
enum BookTypes {
FICTION,
NON_FICTION
}
Then, you can do lookups like
def author = Author.get(1)
def nonFictionByAuthor = Book.findAllByAuthorAndBookType(author, BookTypes.NON_FICTION)
You could also just do something like this...
def author = Author.get(1)
def fictionBooks = author.books.findAll { it.bookType == BookTypes.FICTION }
And then inversely:
def fictionBook = Book.findByTitleAndBookType('Title001', BookTypes.FICTION)
Here are my domain class,
class Company {
String name
static hasMany = [groups:CompanyGroup]
}
class CompanyGroup{
String name
static belongsTo = [company:Company]
}
I receive params that contain name of CompanyGroup and I want to get the result of company that have the CompanyGroup found.
I did like this,
def groupList = account.companies.groups.flatten()
def groupResult = groupList.findAll{
it.name ==~ /(?i).*${params.keyword}.*/
}
I got the Companygroups that have name from params.key from above code. So I want to render company list that have these group like this,
def com = Company.withCriteria{
eq("groups", groupList)
}
render [companies : com]
It doesn't work!
def com = Company.withCriteria{
inList("groups", groupList)
}
I have a problem with saving form values from two domain classes
One class is
class Ip {
String inetAddress
String dns
String os
String toString(){
"${inetAddress}"
}
Hoster hoster
static constraints = {
....
and the second one is just
class Hoster {
static HOSTER_OPTIONS = ["Name1", "Name2", "Name3"]
String name;
String toString(){
"${name}"
}
List ips = new ArrayList()
static hasMany = [ips : Ip]
static constraints = {
name(unique: true, blank: false, inList: HOSTER_OPTIONS)
}
I have a Controller where I handle the data from a form
def systems = new Ip()
systems.inetAddress = params.ip
systems.dns = params.dns
systems.os = params.os
systems.hoster.name = params.hoster
def result = systems.save(flush: true, failOnError: true)
But I didn't get it managed that the data is saved.
You're not associating correctly your domain classes in the controller:
systems.hoster.name = params.hoster
Instead of setting the name, you need to set the instance that exists in the database:
systems.hoster = Hoster.findByName(params.hoster)
I have the classes:
class Course{
String name
static hasMany = [
studentGrades: StudentGrade
]
}
class StudentGrade{
String name
int grade
}
How can I make a criteria to get the courses without any student grade?
You could use the isEmpty criterion method:
def c = Course.createCriteria()
def results = c.list {
isEmpty("studentGrades")
}
See the docs for further informations.