Drop down menu with value from another model

Question

I have products belonging to collections. A collection is just a name. Products have a collection_id.

In my _form view that is used for creation and edition of produ

Answer 1

You can use a collection select, first make sure your models are properly setup:

class Product
  belongs_to :collection
end

class Collection
  has_many :products
end

Then add the collection select to your view:

<%= collection_select(:product, :collection_id, Collection.all, :id, :name) %>

You can also read up on the documentation here.