Many to many with checkbox

[kokolegorille]

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Multiple select form with checkboxes

I know it is possible because I have done that before with Rails and SimpleForm… This example is a many_to_many relationship between User and Role. The point is to use simple input and specify the name of the checkbox as user[roles_ids][] with square brackets at the end. <%= for role <- @roles do %> <label> <%= role.name %>: <input name="user[roles_ids][]" type="checkbox" value="<%= role.id %>"> </label> <% end %> And that is the log from the request (with …