I have two models. Weddings and guests.
class Wedding
has_many guests
end
class Guest
has_many weddings
end
How do I make what guests can accept or decline the invitation?
You need to do a many to many relation with an intermediate model. See guides. See 2.4 The has_many :through Association topic here.
On that new model/table you can add an attribute (a boolean "decline" attribute maybe) to control guests assistance...