Add a field for many_to_many association data in the form

[kokolegorille]

Maybe this post can help

Phoenix form many_to_many

So I am trying to figure out how to work with Forms + Many to many relationships. Lets say I have the following schema "tour" do field :name, :string many_to_many( :city, City, join_through: "tour_cities", on_replace: :delete ) end schema "city" do field :name, :string end And lets assume my tour_controller->create method receives a params map like the following: %{“city” => 1, “name” => “Best tour in the world”} City is supplied via a dropdown i…