CODEWITHSUNDEEP
ruby-on-railsformsassociations
hfhc2
hfhc2

Reputation: 4421

Rails forms for adding / removing associations

I would like to know how to add / remove associations in a form. Lets say I have two models linked by foreign keys

class Event < ActiveRecord::Base
  has_and_belongs_to_many :participants
end

class Participant < ActiveRecord::Base
  has_and_belongs_to_many :events
end

I have created some forms to edit each model. However, is there a way to use the form to remove/add a participant from/to a lecture? (I guess this would require some javascript to add / remove entries in the view as well as well...)

Upvotes: 1

Views: 200

Answers (1)

Rodrigo Martinez
Rodrigo Martinez

Reputation: 711

What you are looking for is accepts_nested_attributes_for and some js magic. Ryan Bates describes this perfectly in some of his free episodes:

Nested Model Form Part 1

Nested Model Form Part 2

And here is the full source code of this episodes. Maybe you'll have to adapt some things because it's a little old, for instance replace link_to_function for a simple link_to with an :onclick event, but I think pretty much everything else works on Rails 4.

Hope it helps!

Upvotes: 1

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