我有一个表单来创建BookingAccommodation模型的示例。此模型属于一个Accommodation，并具有一个internal_name。

<%= form_with model: @booking_accommodation, url: property_settings_accommodations_type_booking_accommodations_path(@accommodation) do |f| %>
    <div class="flex flex-col">
        <%= f.label :internal_name %>
        <%= f.text_field :internal_name, class: "border" %>
    </div>
    
    <div>
        <%= f.submit %>
    </div>
<% end %>

class Property::Settings::Accommodations::BookingAccommodationsController < PropertyController
    def create
        @accommodation = Accommodation.find(params[:type_id])
        @booking_accommodation = @accommodation.booking_accommodations.new(booking_accommodation_params)

        if @booking_accommodation.save
            redirect_to edit_property_settings_accommodations_type_path(@accommodation)
        else
            # Handle error
        end
    end
    
    private

    def booking_accommodation_params
        params.require(:booking_accommodation).permit(:internal_name)
    end
end

text_field生成的html如下：

<input class="border" type="text" name="internal_name" id="internal_name">

但是这需要有一个像这样的booking_accommodation子哈希：

<input class="border" type="text" name="booking_accommodation[internal_name]" id="internal_name">

如果我没有子散列，参数就不会嵌套，表单就会产生错误。这是什么原因造成的？