I have a Lift app that's managing its own domain objects in a MongoDB.
At one point I had an object with a list of embedded objects and all
worked well. My users had many accounts, and I did something like:
private def bindAccountFields(in:NodeSeq, a:Account,
isNewAccount:Boolean):NodeSeq = {...}
Then, from my Manage.render snippet:
user.accounts.isEmpty match {
case true => <p>You have no accounts configured.</p>
case false => user.accounts.flatMap(bindAccountFields(in, _,
false))
}
I recently wanted to change User.accounts to a Map[String, Account],
since accounts are named and should have unique names. So I did that,
and changed the above to:
user.accounts.isEmpty match {
case true => <p>You have no accounts configured.</p>
case false => user.accounts.flatMap((v:Tuple2[String, Account])
=> bindAccountFields(in, v._2, false))
}
Except, try though I might, I can't seem to eliminate this error:
[error]
/home/nolan/Projects/Utterance2/src/main/scala/info/thewordnerd/utterance/snippet/Manage.scala:67:
type mismatch;
[error] found : Iterable[scala.xml.Node]
[error] required: scala.xml.NodeSeq
[error] case false => user.accounts.flatMap((v:Tuple2[String,
Account]) => bindAccountFields(in, v._2, false))
[error] ^
[error] one error found
bindAccountFields hasn't changed at all. I'm just changing the
collection I iterate over to call it, and the parameter it was passed.
Am I missing something obvious? The whole "binding snippets to a
collection" thing seems like magic to me. The getting started guide
shows it done, but unless I read carelessly, it really doesn't explain
how binding works in that situation. Are prefixes bound in order such
that each time I call, say, <account.name/> in a form I get the next
value bound there? Does that hold true such that I can have an
Account.edit and Account.render snippet, both of which bind to
<account:name/>, only the edit snippet binds a text field while the
render snippet just displays text? So I'd then have to call the snippets
in the order I've bound them? Obviously that wouldn't be advisable if my
assumption is true, I'm just trying to understand how this particular
bit of magic works. :)
Thanks.
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