On Mon, Oct 26, 2009 at 12:05 PM, Naftoli Gugenheim <naftoli...@gmail.com>wrote:
>
> It would be feasible to refactor ManyToMany to remove this restriction.
> OneToMany does not require either side to be saved first.
> Can you describe a use case where it would be desirable?
>
I don't think there is.
OneToMany it makes sense that there is no requirement for either side to be
saved first. However, the pivot table involved in a ManyToMany always needs
both PK's to be unique.
> -------------------------------------
> Jim Barrows<jim.barr...@gmail.com> wrote:
>
> On Mon, Oct 26, 2009 at 11:43 AM, GA <my_li...@me.com> wrote:
>
> > I have made a test that worked. I have modified my code like this:
> >
> > newUser.save
> > newUser.devices += newDevice
> > newUser.save
> >
> > The newDevice was already saved. It looks like both parents must be saved
> > before I save the relationship. Am I right? or I am doing something
> wrong?
> >
>
> No, you always have to save the parents before the relationship. Well.. as
> long as the relationship table has the parents PK as it's PK's anyway.
> If you remove that restriction, then nah.. it doesn't matter. Of course
> that way lies madness....
>
>
> > Thanks,
> >
> > GA
> >
> >
> >
> >
> > On Oct 26, 2009, at 6:55 PM, GA wrote:
> >
> > Hello guys,
> >
> > I have a many-to-many relationship between two mappers called, Users and
> > Devices.
> >
> > There is also an API that receives and XML message that contains one user
> > and one device.
> >
> > The API could create the Device and User with the relationship or it
> could
> > create only the relationship in case the users and/or device already
> exists.
> >
> > The problem I have is that the API creates the User and the Device, but
> the
> > not the relationship. This is the code that saves the records (just a
> test
> > for a now):
> >
> > def addUser(req: Req): LiftResponse = {
> >
> > var tempUserName = ""
> > var tempDeviceName = ""
> > var deviceAlreadyExists = false
> >
> > val newUser = new User
> > val newDevice = new Device
> > req.xml match {
> > case Full(<person>{parameters @_*}</person>) => {
> > for(parameter <- parameters){ parameter match {
> > case <userName>{userName}</userName> =>
> > tempUserName = userName.text
> > case <firstName>{firstName}</firstName> =>
> > newUser.firstName(firstName.text)
> > case <lastName>{lastName}</lastName> =>
> > newUser.lastName(lastName.text)
> > case <password>{password}</password> =>
> > newUser.password(password.text)
> > case <email>{email}</email> =>
> > newUser.email(email.text)
> > case <createdon>{createdOn}</createdon> =>
> > newUser.createdOn(new java.util.Date(createdOn.text))
> > case <updatedon>{updatedOn}</updatedon> =>
> > newUser.updatedOn(new java.util.Date(updatedOn.text))
> > case <device>{deviceName}</device> =>
> > tempDeviceName = deviceName.text
> > case _ =>
> > }
> > }
> > try {
> > Device.find(By(Device.deviceName,tempDeviceName))
> > match {
> > case Full(deviceRequested) =>
> > deviceAlreadyExists = true
> > case _ => {
> > newDevice.deviceName(tempDeviceName)
> > newDevice.createdBy(tempUserName)
> >
> newDevice.createdOn(newUser.createdOn)
> > newDevice.updatedBy(tempUserName)
> >
> newDevice.updatedOn(newUser.updatedOn)
> > newDevice.save
> > }
> > }
> > User.find(By(User.userName, tempUserName)) match
> {
> > case Full(userRequested) =>
> > CreatedResponse(wrapXmlBody(<operation
> > id="addPerson" success="1"></operation>), "text/xml")
> > case _ => {
> > newUser.userName(tempUserName)
> > newUser.createdBy(tempUserName)
> > newUser.updatedBy(tempUserName)
> > newUser.devices.clear
> > newUser.validated(true)
> > *newUser.devices += newDevice*
> > newUser.save
> >
> CreatedResponse(wrapXmlBody(<operation
> > id="addPerson" success="0"></operation>), "text/xml")
> > }
> > }
> > }
> > catch {
> > case e => Log.error("Could not add
> person/device",
> > e); BadResponse()
> > }
> > }
> > case _ => Log.error("Request was malformed "+req.view);
> > BadResponse()
> > }
> > }
> >
> > The field "devices" is the MappedManyToMany field within the User mapper.
> >
> > What am I doing wrong?
> >
> > Thanks in advance,
> >
> > GA
> >
> >
> >
> >
> >
> > >
> >
>
>
> --
> James A Barrows
>
>
>
> >
>
--
James A Barrows
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