grails-domain-class

问题 I have two domain classes: User class User { String username String password String email Date dateCreated Date lastUpdated // static belongsTo = [profile: Profile] static constraints = { username size: 3..20, unique: true, nullable: false, validator: { _username -> _username.toLowerCase() == _username } password size: 6..100, nullable: false, validator: { _password, user -> _password != user.username } email email: true, blank: false // profile nullable: true } } and Profile: class Profile {

问题 I have a domain class called Form which has an embedded field called union of type Organization which is embedded. Organization has the field createdByUser . User has a field organization of type Organization added by AST transformation. So, whenever i try to save a Form object, it tries to change the user reference by createdByUser to an organization id of 1 for mysterious reasons. 来源： https://stackoverflow.com/questions/30714307/grails-mongo-gorm-mysteriously-thinks-a-object-referenced-by

问题 I want to fetch data from already existing database from another project into my Grails project and list the data. Should I be creating a domain controller for the already existing db? I know how to create domain-controller and use data migration plugin to update db but none of the books I read had any information on how to setup and read from an existing database. I'm using MySQL for my database. 回答1: Use the Reverse Engineer plugin to create domain classes from your existing database: http:

问题 I would like to use the ENRON GraphML dataset, loaded into Neo4j, as a database for my Grails 2.0 application. The use-case for the data is read-only. I have had no trouble loading the dataset and creating a database in a stand-alone application, and now would like to use the Grails plugin to manage access to the database. Looking at the Neo4J plugin documentation on mapping domain classes, I see that it requires subreference nodes for each type of vertex. My data doesn't have that. I can see

问题 I have two domains that are connected with one-to-many relation - One User may have many Associations. I want to view all associations that belong to this user. I'm using scaffolding plugin. So code that should return list of Associations in AssociationController looks lile this: def index(Integer max) { respond Association.list(params), model:[associationInstanceCount: Association.count()] } And on the User view page I have the following code: <g:form controller="Association" > <fieldset

问题 we are using grails to develop some web application For Domain class that have child class , I'm wondering if we can duplicate whole object including all child object that belong to Parent ? Thank you 回答1: As given in the comments, you can extend gorm with a clone method. However, a very simple solution if you don't want to mess with the gorm api is to detach the existing object and just "resave" it. Note that this won't perform a deepClone . Steps: Null the id. Update fields that should

问题 I've set a default value, for maxSize constraint, to all my domains, using config.grails.gorm.default.constraints = { ... '*'(..., maxSize: 80) ... } Now, I want to override this value inside my domain class; I can do that by defining it there static constraints = { ... prop maxSize: 120 ... } But how could I make it unlimited, for instance? I wish it could have been done by providing -1 . Or the String and other Collection s could have been handled differently, by using two different

问题 One of the advantages of Grails 2.0 is that you can change domain classes in development without needing to restart the application server. This works, however when I change domain classes I lose all my bootstrap data, which basically defeats the purpose. I'm using the default h2 database. What is the best way to get around this? Do I have to go to an external DB like Postgres? 回答1: The default DataSource.groovy in a newly-created Grails 2 app has environments { development { dataSource {

问题 Given the following User class: class User { String name static hasMany = [friends: User] } I want that a User can have many friends which are instances of the user domain class. How do I have to implement the friend relationship of a user? 回答1: 1. How Do you Define the relathionship class User { static hasMany = [ friends: User ] static mappedBy = [ friends: 'friends' ] //this how you refer to it using GORM as well as Database String name String toString() { name } def static constrains () {

问题 The output of my test gives com.example.book.Book : null . When I debug the test, b object is created with "MyBook" as its name . But since its has a static mapping belongsTo , the test fails. How do I make this work. When I comment the belongsTo mapping in the Books.groovy, the test passes. So how do I test Domain classes with mappings. Should I instantiate a Library object and add a Book object to it? But that doesn't make testing the domain class in isolation as it is meant to be in a unit