Le 2011-03-29 à 16:03, Andrew Kinnie a écrit :
> Thanks for the tip on using create that way. I didn't know you could do
> that. In any event, that's the problem. NoteType is basically a lookup
> table. I would want to fetch an existing noteType based on some unique
> attribute, such as "typeName" (which ensure is unique in the EO class) I
> don't want to create a new noteType, I want to create the intervening object
> (DeviceNoteType) which has a to-one to NoteType and a to-one to Device. AND
> (here's the tough part - for me at least) I want to only create a new one if
> one doesn't already exist. So I need to fetch first, and I want to fetch
> based on the value passed in for the name key
So you will do:
new ERXRoute(NoteType.ENTITY_NAME, "/NoteType/{name:String}",
ERXRoute.Method.Get, NoteTypesController.class, "fetchByName");
public WOActionResults fetchByNameAction() {
String typeName = routeObjectForKey("name");
NoteType type = NoteType.fetchNoteType(editingContext(),
User.NAME.eq(typeName));
return response(type, yourerxkeyfilter());
}
If fetchByNameAction didn't find an object, ERRest will return the HTTP code
404, so your client can know that the object was not found, and call:
new ERXRoute(NoteType.ENTITY_NAME, "/NoteType/", ERXRoute.Method.Post,
NoteTypesController.class, "create"); // If you called addDefaultRoutes for
the NoteType entity, that route already exist)
public WOActionResults createAction() {
NoteType type = create(NoteType.ENTITY_NAME, yourerxkeyfilter());
editingContext().saveChanges();
return response(type, yourerxkeyfilter());
}
If you get a response with HTTP code in the 20x range, the object was created
and now you can create your DeviceNoteType with a route like this:
new ERXRoute(DeviceNoteType.ENTITY_NAME, "/DeviceNoteType",
ERXRoute.Method.Post, DeviceNoteTypesController.class, "create");
When you call POST /cgi-bin/WebObjects/MyApp.woa/ra/DeviceNoteType, you will
have to pass the a Device and a NoteType object in JSON as the body of the
request.
I feel like I'm writing my WOWODC session in real-time :-P
> So I need to fetch on the passed in value from the json, get the correct
> NoteType at the other end of the many to many, check if there is an existing
> row in the join table for the device and noteType, and create a new one, only
> if the intervening object doesn't exist. If it does exist, I set it's status
> to active and return that, otherwise, I return the new one.
>
> That's my theory at least.
>
>
>
> On Mar 29, 2011, at 3:47 PM, Pascal Robert wrote:
>
>>
>> Le 2011-03-29 à 15:31, Andrew Kinnie a écrit :
>>
>>> Well, first I tried to simply create the intervening object manually, but
>>> then I realized I wanted to know if such an object already existed, so I
>>> was going to do a fetch, but as random client wouldn't know the primary key
>>> of the NoteType, I am not sure how to do that. I could expose the primary
>>> key, but I'd much rather not.
>>>
>>> Presumably, the client could simple call the curl commands to create the
>>> intervening object, then add the current object with a second line, but I
>>> wanted to be able to do this in the java itself so the client could do
>>> something like:
>>>
>>> curl -X PUT -d "{noteType:{type:'NoteType', name:'Alert'}}"
>>> http://My-MacBook-Pro.local:9001/cgi-bin/WebObjects/MyApp.woa/ra/Device/1/addNoteType.json
>>>
>>> Then I would get the device, get the NoteType represented by the
>>> routeObjectForKey("noteType") and set add the noteType to the relationship.
>>>
>>> public WOActionResults addNoteTypeAction() {
>>> Device device = Device();
>>> NoteType type = routeObjectForKey("noteType");
>>> // set the relationships and do whatever else
>>> ...
>>
>> If you want to create a new NoteType to a Device, you should call the
>> create() method in addNoteTypeAction instead of routeObjectForKey, and set
>> the relation between the NoteType and the Device:
>>
>> public WOActionResults addNodeTypeAction() {
>> NoteType nodeType = create(NoteType.ENTITY_NAME, yourerxkeyfilter);
>> Device device = routeObjectForKey("device");
>> // set the relationship and call ec.saveObjects();
>> return response(nodeType, yourerxkeyfilter);
>> }
>>
>> And your route:
>>
>> requestHandler.addRoute(new ERXRoute(Device.ENTITY_NAME,
>> "/Device/{device:Device}/addNoteType", ERXRoute.Method.Put,
>> DevicesController.class, "addNoteType"));
>>
>> This is untested, of course.
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