domain-data-modelling | 易学教程

Grails Domain Class : hasOne, hasMany without belongsTo

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问题 I am new to Grails. Can I use "hasOne" or "hasMany" without using "belongsTo" to another domain-class? Thanks in advance. 回答1: Yes, you can. See examples in Grails doc: http://grails.org/doc/2.3.8/guide/GORM.html#manyToOneAndOneToOne hasMany (without belongsTo) example from the doc: A one-to-many relationship is when one class, example Author, has many instances of another class, example Book. With Grails you define such a relationship with the hasMany setting: class Author { static hasMany =

ASP.Net MVC - Is this entity layer a step too far?

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问题 I have a domain data model which returns a class such as the following: public class ZombieDeath { public virtual int ZombieId {get;set;} public virtual FatalHit {get;set;} } public class FatalHit { public virtual int HitId {get;set;} public virtual string Zone {get;set;} public virtual string Weapon {get;set;} } When passing this data back to my grids, I've read that is best to always return data to the views in a flattened format. So I have the following class that represents a grid row:

Grails Domain Class : hasOne, hasMany without belongsTo

阅读更多关于 Grails Domain Class : hasOne, hasMany without belongsTo

I am new to Grails. Can I use "hasOne" or "hasMany" without using "belongsTo" to another domain-class? Thanks in advance. Yes, you can. See examples in Grails doc: http://grails.org/doc/2.3.8/guide/GORM.html#manyToOneAndOneToOne hasMany (without belongsTo) example from the doc: A one-to-many relationship is when one class, example Author, has many instances of another class, example Book. With Grails you define such a relationship with the hasMany setting: class Author { static hasMany = [books: Book] String name } class Book { String title } In this case we have a unidirectional one-to-many.