[2.1.1 Scala] File upload with validation of said file

[Joe Zulli]

Hi Everyone,

I'm working on adding file upload to a form page that I have. I implemented it almost verbatim from the example here. Here's the specific code from the example:

def upload = Action(parse.multipartFormData) { request =>
  request.body.file("picture").map { picture =>
    import java.io.File
    val filename = picture.filename 
    val contentType = picture.contentType
    picture.ref.moveTo(new File("/tmp/picture"))
    Ok("File uploaded")
  }.getOrElse {
    Redirect(routes.Application.index).flashing(
      "error" -> "Missing file"
    )
  }
}

Works great, but now I want to improve the error handling. Mainly, I do not want to redirect to somewhere else, I would like to stay on the form that I'm already on, and show a validation error. How do I do that? I tried by changing this line:

    Redirect(routes.Application.index).flashing(
      "error" -> "Missing file"

 to this instead...

BadRequest(views.html.user.edit(myForm.withError(new FormError("photo", "My Error Message!!!"))

and while it does keep me on the form, it never displays my error message. My guess is that this is happening because "photo," the name of the file input tag, is not a field explicitly mapped in "myForm." Can anyone help me get my error message to display? Alternatively, are there any good examples out there or robust validation on forms with file uploads in Scala that I can look at? My controller is handling several different kinds of validation errors (ex: file size too big, invalid dimensions, etc...). I just need to be able to display them.

Thanks in advance!

Joe 

[Guillaume Bort]

How do you try to retrieve the error message in the template?

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Guillaume Bort, http://guillaume.bort.fr

[Joe Zulli]

Hi Guillaume,

Thanks for the hint :). I was indeed not retrieving the error message correctly in the template. Here's what I ended up doing that worked:

            <div class="control-group controls-row @form.errors.filter(_.key == "photo").map( error => "error")">

                <label for="photo" class="control-label">Photo</label>

                <img src="@asset("images/no_image_80_x_50.png")" class="img-polaroid">

                <input type="file" id="photo" name="photo">

                @chainForm.errors.filter(_.key == "photo").map { error =>

                    <p class="help-block">@error.message</p>

                }

            </div>

Hope that helps for others who are trying to do the same thing. It's a little funny looking, but it works :). If anyone has a better or more elegant way to do it, let me know. I'm still new-ish to Play.

Joe