Generation of multiple groups of the same structure

[andrba]

Sometimes it is necessary to create multiple groups of the same type. Imagine we have a form that asks about the addresses a person lived at within 10 years. Each address should consist of the following fields:

text_field :line_1
text_field :line_2
text_field :city
text_field country

Rather than copy-pasting 10..20 groups in the form definition we could set a quantity: 10 or multiple: true parameter which will render these groups automatically. Each group will have its number in the name, like page_mygroup_1 with field names like page_mygroup_1_city.

The question is how it will be rendered in the Rails app. Obviously we should not show to a user 10 groups all at once. I see two ways of doing it:

1. Controlling dropdown
   Link group visibility to a dropdown with numbers 0..10. When a user selects the quantity of groups the corresponding amount of groups become visible.
2. Add more / Delete buttons
   A group is rendered as a template that will be used by js to generate more groups. When a user clicks on "Add More" a new group is generated and becomes visible. Next to the group will be a button to delete this group.

Any other ideas are welcome!

[andrba]

This became mostly a representation issue and has to be resolved in the dependant gems