Feature request: one-to-many model support

[kamazheng]

Is it possible to support one to many model form?

[phmatray]

Hello @kamazheng,

Yes, it will be definitely possible to support one-to-many model forms in FormCraft! This would allow forms to handle collections like order items, addresses, or any parent-child relationships.

FormCraft currently has limited collection support - mainly for file uploads and multi-select fields. However, it doesn't have built-in support for one-to-many relationships with complex objects.

I'll see what APIs I can add to make this use case as easy to use as possible.

[phmatray]

I think about implementing something like this :

public class OrderModel
{
    public string OrderNumber { get; set; } = "";
    public List<OrderItemModel> Items { get; set; } = new();
    public decimal TotalAmount => Items.Sum(x => x.TotalPrice);
}

public class OrderItemModel  
{
    public string ProductName { get; set; } = "";
    public int Quantity { get; set; } = 1;
    public decimal UnitPrice { get; set; } = 0m;
    public decimal TotalPrice => Quantity * UnitPrice;
}

// Form configuration
var formConfig = FormBuilder<OrderModel>
    .Create()
    .AddField(x => x.OrderNumber)
    .AddCollectionField(x => x.Items, collection => collection
        .AllowAdd()
        .AllowRemove()
        .WithMinItems(1)
        .WithItemForm(item => item
            .AddField(x => x.ProductName, field => field.Required())
            .AddField(x => x.Quantity, field => field.WithRange(1, 100))
            .AddField(x => x.UnitPrice, field => field.WithRange(0.01m, 10000m))))
    .Build();