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Ich lerne ReactiveMongo. In meiner Anwendung möchte ich Daten von MongoDB abrufen und in einem HTML-Formular ausfüllen.bekommen None.get beim Ausfüllen eines HTML-Formulars aus Daten von MongoDB in PlayFramework, Scala, reactivemongo Anwendung
Früher war mein Problem, dass Code nicht kompiliert wurde. Ich habe es behoben, aber jetzt bekomme ich None.get statt Wert aus der Datenbank.
Die Daten, die ich in MongoDB haben Karte zu folgenden Fall Klasse
case class User2(
name:String,
email:String,
age:Int,
gender:Boolean
)
Es folgt der Leser durch Reaktive Mongo erforderlich.
Question1 - Ich erhalte None.get statt Wert von MongoDB
object User2{
implicit object UserReader extends BSONDocumentReader[User2] {
def read(doc: BSONDocument): User2= {
val name = doc.getAs[String]("name").get
val email = doc.getAs[String]("email").get
val age = doc.getAs[Int]("age").get
val gender = doc.getAs[Boolean]("gender").get
User2(name, email, age, gender)
}
}
}
Im Anschluss ist mein Controller-Code. Ignorieren Sie die unnötigen Importe
package controllers
import anorm.{NotAssigned, Pk}
import play.api.data.Form
import play.api.data.Form._
import play.api.data.Forms
import play.api.mvc.Controller
import play.api.mvc._
import play.api.data.Forms._
import play.api.data.validation.Constraints._
import play.api.db.DB
import models._
import scala.concurrent._
import ExecutionContext.Implicits.global
import scala.util.Try
import reactivemongo.api.MongoDriver
import reactivemongo.bson._
import reactivemongo.api.MongoConnection
import reactivemongo.api.collections.default.BSONCollection
object Application_Test extends Controller {
val user2Form: Form[User2] = Form(
mapping(
"name" -> nonEmptyText,
"email" -> email,
"age" -> number,
"gender" -> boolean
)(User2.apply)(User2.unapply)
)
def index = Action {
Async {
val driver = new MongoDriver()
val connection = driver.connection(List("localhost"))
val db = connection.db("website-users")
val collection = db.collection[BSONCollection]("user-table")
val query = BSONDocument("name" -> "Manu")
val result = collection.find(query).cursor[User2].collect[List]()
/*
result.map { user =>
//following code doesn't compile. I think result is List[models.User2]. I tried using user and user(0) but none of them compile
Ok(views.html.HTMLTest(user2Form.fill(user)))
}
*/
// this version of code compiles
result.map { user => user match {
case List() => Ok(views.html.HTMLTest(user2Form.fill(User2("a","[email protected]",1,true))))
case h::v => Ok (views.html.HTMLTest (user2Form.fill (h)))
}
}
}
}
}
Es folgt der HTML
Question2 - ist @form ("name") Wert der richtige Weg, um einen Wert aus einem Formular zu extrahieren.?
@(form:Form[User2])
<!DOCTYPE html>
<html lang="en" xmlns:font-variant="http://www.w3.org/1999/xhtml">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-COMPATIBLE" content="IE=edge">
<meta name="viewport" content="width=device-width,initial-scale=1">
<title>HTML Test</title>
<link rel="stylesheet" type="text/css" href="@routes.Assets.at("stylesheets/bootstrap.min.css")">
<!--link rel="stylesheet" href="stylesheets/bootstrap-theme.min.css"-->
<style type="text/css">
html, body{height:100%; margin:0;padding:0}
.center-form {
width:100%;
margin:auto;
position:relative;
top:50%;
transform: translateY(-50%)
}
</style>
</head>
<body>
<div class="container center-form" >
<!-- for medium and large screens,
First row of Bootstrap grid contains logo. Total 3 columns (12/4). Logo in middle column-->
<div class="row" >
<!--empty column-->
<div class="col-md-4 col-lg-4" ></div>
<!--logo column-->
<div class="col-md-4 col-lg-4" >
<div>
<img src="@routes.Assets.at("images/Logo303x64.png")" alt="SalesWorkspace Logo" height="64" width="303">
</div>
</div>
<!--empty column-->
<div class="col-md-4 col-lg-4"></div>
</div>
<!-- for medium and large screens,
Second row of Bootstrap grid contains the form for username and password. Total 3 columns (12/4). -->
<div class="row" >
<!--empty column-->
<div class="col-md-4 col-lg-4"></div>
<!--form-->
<div class="col-md-4 col-lg-4">
<form>
<div class="form-group">
<label for="first-name">First Name</label>
<input type="text" class="form-control" id="first-name" value="@form("name").value" required>
</div>
<div class="form-group">
<label for="last-name">Last Name</label>
<input type="text" class="form-control" id="last-name" value="@form("name").value" required>
</div>
<div class="form-group">
<label for="email">Email</label>
<input type="email" class="form-control" id="email" value="@form("email").value" required>
</div>
<div class="form-group">
<label for="password">Password</label>
<input type="password" class="form-control" id="password" required>
</div>
<div class="form-group">
<label for="confirm-password">Password</label>
<input type="password" class="form-control" id="confirm-password" required>
</div>
<button type="submit" class="btn btn-primary">Login</button>
</form>
</div>
<!--empty column-->
<div class="col-md-4 col-lg-4"></div>
</div>
</div>
<!--script src="@routes.Assets.at("javascripts/jquery-1.9.0.min")"></script-->
<!--script src="@routes.Assets.at("javascripts/bootstrap.min.js")"></script-->
</body>
</html>
Bitte separate Frage separat stellen – cchantep