Grails:如何覆盖生成的服务方法? [英] Grails: How to override generated service method?
问题描述
Grails新手在这里.我想重写此处显示的生成服务的get()和list()方法.
Grails novice here. I would like to override the get() and list() methods of the generated service shown here.
@Service(PlayerFile)
interface PlayerFileService {
PlayerFile get(Serializable id)
List<PlayerFile> list(Map args)
Long count()
void delete(Serializable id)
PlayerFile save(PlayerFile playerFile)
}
为什么?默认的服务/支架模型显示PlayerFile类的所有域对象.我想对此进行过滤,以便仅显示属于已登录用户(即所有者)的对象.
Why? The default service/scaffolding model shows all domain objects for the PlayerFile class. I want to filter this so that only the objects belonging to the logged in user (i.e. the owner) are displayed.
感谢您提出的建议.
这是PlayerFile域类
Here is the PlayerFile domain class
class PlayerFile {
String playersJson
Date dateCreated
Date lastUpdated
static belongsTo = [owner: User]
static constraints = {
playersJson sqlType: 'text', nullable: false, widget: 'textarea'
owner nullable: false, editable: false
}
}
推荐答案
您可能不想覆盖 get
方法.您可能想要一种新的查询方法...
You probably don't want to override the get
method. You probably want a new query method...
@Service(PlayerFile)
interface PlayerFileService {
PlayerFile get(Serializable id)
List<PlayerFile> list(Map args)
Long count()
void delete(Serializable id)
PlayerFile save(PlayerFile playerFile)
List<PlayerFile> findByOwner(User owner)
}
如果不需要 get
方法用于其他目的,请将其删除.
If you don't need the get
method for other purposes, delete it.
编辑
解决以下评论:
我将上面显示的findByOwner()的代码放在哪里?不可能是添加到抽象界面中.
Where do I put the code for findByOwner() shown above? It can't be added to an abstract interface.
我不同意.它绝对可以在抽象界面中.您可以将 PlayerFileService
转换为 abstract
class
,并将 findByOwner
设置为具体方法,但不必这样做.它可以是接口中的抽象方法,这在GORM数据服务中是很常见的.
I don't agree with that. It can definitely be in an abstract interface. You could turn PlayerFileService
into an abstract
class
and make findByOwner
a concrete method, but you do not have to. It can be an abstract method in an interface, which is the common thing in a GORM Data Service like this.
请参见 https://github.com/jeffbrown/rock298query 上的项目.
package rock298query
import grails.gorm.services.Service
@Service(PlayerFile)
interface PlayerFileService {
PlayerFile get(Serializable id)
List<PlayerFile> list(Map args)
Long count()
void delete(Serializable id)
PlayerFile save(PlayerFile playerFile)
List<PlayerFile> findByOwner(User owner)
}
package rock298query
class BootStrap {
UserService userService
PlayerFileService playerFileService
def init = { servletContext ->
def jeff = userService.save('Jeff')
def jake = userService.save('Jake')
jeff.addToFiles(new PlayerFile(playersJson: '{"title":"Jeff File 1"'))
jeff.addToFiles(new PlayerFile(playersJson: '{"title":"Jeff File 2"'))
jeff.addToFiles(new PlayerFile(playersJson: '{"title":"Jeff File 3"'))
userService.save jeff
jake.addToFiles(new PlayerFile(playersJson: '{"title":"Jake File 1"'))
jake.addToFiles(new PlayerFile(playersJson: '{"title":"Jake File 2"'))
jake.addToFiles(new PlayerFile(playersJson: '{"title":"Jake File 3"'))
userService.save jake
}
def destroy = {
}
}
package rock298query
class DemoController {
PlayerFileService playerFileService
UserService userService
def jakeFiles() {
def jake = userService.find('Jake')
def files = playerFileService.findByOwner(jake)
render files*.playersJson
}
def jeffFiles() {
def jeff = userService.find('Jeff')
def files = playerFileService.findByOwner(jeff)
render files*.playersJson
}
}
一切似乎正常.
~ $ curl http://localhost:8080/demo/jakeFiles
['{"title":"Jake File 1"', '{"title":"Jake File 2"', '{"title":"Jake File 3"']
~ $
~ $ curl http://localhost:8080/demo/jeffFiles
['{"title":"Jeff File 1"', '{"title":"Jeff File 2"', '{"title":"Jeff File 3"']
我希望能帮上忙.
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