Vaadin one to many and Grid binding.Property not found

Question

There is the Customer entity which has a one to many relationship to entity Address,so there is a List<Address> getAddress in Customer.Address has an Email field.

So for instance to get an email from the first customer you do customer.getAddress.get(0).getEmail

When I bind to a Customer.class grid,setColumns("customerid","address.email") it throws an exception Property not found.

If I do addColumn(customer->customer.getAddress.get(0).get email).setHeader(email) it does display the email.

But that's for the first customer.How to do the same for all customers?

Answer 1

The default presentation for a List is toString(). You need to create a Renderer to display the list nicely. For better performance you can create a LitRenderer. See also the Lit documentation for repeating templates.

grid.addColumn(LitRenderer.<Customer>of("""
        ${item.address.map((adr) => 
            html`<span>${adr.email}</span><br />`
        )}
        """).withProperty("address", Customer::getAddress));

Would look like this:

Maybe replace the span element with <a href="mailto:${adr.email}">${adr.email}</a> for better UX.