PlayFramework (2.5.x) doesn't bind data from form returning Ojbect with null fields
Question
The problem is to bind data from form (or from Map of parameters) to actual Form object. I have added some println just for testing purposes. Here is code for Controller class.
package controllers;
import java.util.List;
import javax.inject.Inject;
import models.Product;
import play.data.Form;
import play.data.FormFactory;
import play.mvc.Controller;
import play.mvc.Result;
import views.html.products.list;
import views.html.products.details;
public class Products extends Controller {
@Inject
public Products(FormFactory formFactory) {
productForm = formFactory.form(Product.class);
}
private static Form<Product> productForm;
public Result list(){
List<Product> products = Product.findAll();
return ok(list.render(products));
}
public Result newProduct(){
return ok(details.render(productForm));
}
public Result save(){
Form<Product> filledForm=productForm.fill(new Product("0000","0000","0000"));
Form<Product> boundForm=productForm.bindFromRequest();
final Product product =(Product) boundForm.get();
System.out.println(">>Bound ean form data: "+boundForm.field("ean").value()+"->Product from bound form: "+boundForm.get());
System.out.println(">>Filled ean form data: "+filledForm.field("ean").value()+"->Product from filled form: "+filledForm.get());
//product.save();
flash("success",String.format("Successfully added product %s", product));
return redirect(routes.Products.list());
}
}
Here for the purpose of simplicity class Product is just of three public fields:
package models;
public class Product {
public String ean;
public String name;
public String description;
public Product() {}
public Product(String ean, String name, String description) {
this.ean = ean;
this.name = name;
this.description = description;
}
public String toString() {
return String.format("%s - %s", ean, name);
}
}
And here is Play template( without main wrapper template that take care of <head> <body> stuff)
@(productForm: Form[Product])
@import helper._
@main("Product form") {
<div class="main">
<h1>Product form</h1>
@helper.form(action = routes.Products.save(),'_class -> "form-group") {
<fieldset>
<legend>Product (@productForm("name").valueOr("New"))</legend>
@helper.inputText(productForm("ean"), '_label -> "EAN",'_class->"input")
@helper.inputText(productForm("name"),'_label -> "Name",'_class->"input")
@helper.textarea(productForm("description"), '_label -> "Description",'_class->"input")
</fieldset>
<input type="submit" class="btn btn-success" value="Save">
<a class="btn btn-warning" href="@routes.Products.index()">Cancel</a>
}
}
Everything rides nice and smooth except that I get Product object with null fields, but field(fieldName).value() or data() return correct data. Looks like Form behaves as DynamicForm. Strange things starting to happen when I use bind(Map<String,String>) instead of bindFromRequest() - same result both. And resul from console is (i have used testEAN filling the form "ean" field)
>>Bound ean form data: testEAN->Product from bound form: null - null
>>Filled ean form data: null->Product from filled form: 0000 - 0000
2 answers
solution1
5 ACCPTED 2017-03-26 19:33:08
Need to add property accessors/mutators ( getXXX/setXXX ) in Product class . That is crucial point
solution2
1 2017-03-24 16:07:49
You have to provide the type of the form
Form<Product> boundForm = factoryForm.form(Product.class).bindFromRequest();
Product product = boundForm.get();
If you do not provide the type of the object you are biding how play will infer the fields and properties?!
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