You don't even need f.get in there as it turns out. "f.get" should
just be "file". Beautiful. Thanks for the tip.
On Dec 1, 8:07 pm, David Pollak <feeder.of.the.be...@gmail.com> wrote:
> On Tue, Dec 1, 2009 at 8:03 PM, DMB <combust...@gmail.com> wrote:
> > Ended up doing this:
>
> > def show(xhtml: NodeSeq) : NodeSeq = {
> > if(S.post_?) {
> > val f : Option[FileParamHolder] = S.request match {
> > case Empty => Empty
> > case Full(req) =>
> > req.uploadedFiles.find(_.name == "file_upload")
> > }
>
> > if(f.isDefined) {
> > acceptFile(f.get)
> > }
> > }
> > return xhtml
> > }
>
> This is a place for a for comprehension:
>
> def show(xhtml: NodeSeq): NodeSeq = {
> for {
> request <- S.request if S.post_?
> file <- request.uploadedFiles.find(_.name == "file_upload")
> } acceptFile(f.get)
>
> xhtml
>
> }
>
> Note that the code is shorter, reads better and has no branches in it.
>
>
>
>
>
> > And putting a bare upload field in the snippet, like you sugested. I
> > still wonder if the binding method is the best place for this, though.
>
> > On Dec 1, 10:14 am, David Pollak <feeder.of.the.be...@gmail.com>
> > wrote:
> > > If you have the Req (request), you can do:
>
> > > val req: Req = ...
> > > val theFile: Option[FileParamHolder] = req.uploadedFiles.find(_.name ==
> > > "my_param_name")
>
> > > On Tue, Dec 1, 2009 at 2:49 AM, DMB <combust...@gmail.com> wrote:
> > > > Just what I was looking for, thanks!
>
> > > > By the way, is there a way to assign a "name" attribute to a file
> > > > upload input field? The reason is I have a legacy piece of code that
> > > > does HTTP uploads by simulating a form submit. This code requires that
> > > > the form field name be known in advance, for obvious reasons.
>
> > > > On Nov 30, 9:26 pm, David Pollak <feeder.of.the.be...@gmail.com>
> > > > wrote:
> > > > > Folks,
>
> > > > > Lately there's been a bunch of chatter on the list about image upload
> > and
> > > > > figuring out how to put the image files in the right place to serve
> > them
> > > > > again.
>
> > > > > I've written a simple example of image uploading, storing the image
> > in
> > > > the
> > > > > RDBMS and then serving the image. You can find the code at:
> > > >http://github.com/dpp/imagine/
>
> > > > > The file upload snippet is very simple:
>
> > > > > class DoUpload {
> > > > > private def saveFile(fp: FileParamHolder): Unit = {
> > > > > fp.file match {
> > > > > case null =>
> > > > > case x if x.length == 0 =>
> > > > > case x =>
> > > > > val blob = ImageBlob.create.image(x).saveMe
> > > > > ImageInfo.create.name
> > > > > (fp.fileName).mimeType(fp.mimeType).blob(blob).saveMe
> > > > > S.notice("Thanks for the upload")
> > > > > S.redirectTo("/")
> > > > > }
> > > > > }
>
> > > > > def render(in: NodeSeq): NodeSeq =
> > > > > bind("upload", in, "file" -> SHtml.fileUpload(saveFile _))
>
> > > > > }
>
> > > > > If the blob is uploaded, it's put in a row in ImageBlob and an
> > ImageInfo
> > > > row
> > > > > is created to store the name and mime type. There are two different
> > rows
> > > > so
> > > > > that one doesn't have to pull the whole blob back when you're
> > checking
> > > > for
> > > > > the upload date.
>
> > > > > Serving the image is similarly concise:
>
> > > > > def serveImage: LiftRules.DispatchPF = {
> > > > > case req @ Req("images" :: _ :: Nil, _, GetRequest) if
> > > > > findFromRequest(req).isDefined =>
> > > > > () => {
> > > > > val info = findFromRequest(req).open_! // open is valid here
> > > > because
> > > > > we just tested in the guard
>
> > > > > // Test for expiration
> > > > > req.testFor304(info.date, "Expires" -> toInternetDate(millis
> > +
> > > > > 30.days)) or
> > > > > // load the blob and return it
> > > > > info.blob.obj.map(blob => InMemoryResponse(blob.image,
> > > > > List(("Last-Modified", toInternetDate(info.date.is)),
>
> > > > > ("Expires", toInternetDate(millis + 30.days)),
>
> > > > > ("Content-Type", info.mimeType.is)), Nil, 200))
> > > > > }
> > > > > }
>
> > > > > If the request matches /images/xxx where xxx is a name in the
> > ImageInfo
> > > > > table, check to see if we can return a 304 (not modified). If not,
> > we
> > > > pull
> > > > > the blob from the database and return it.
>
> > > > > I hope this helps folks who are looking to manage and serve images.
>
> > > > > Thanks,
>
> > > > > David
>
> > > > > --
> > > > > Lift, the simply functional web frameworkhttp://liftweb.net
> > > > > Beginning Scalahttp://www.apress.com/book/view/1430219890
> > > > > Follow me:http://twitter.com/dpp
> > > > > Surf the harmonics
>
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> Lift, the simply functional web frameworkhttp://liftweb.net
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