Rails adding params from multiple models

Question

I'm not shure what's the right way to do this, so I hope to get some advice of how to do this 'nice'. Let's say you have a model with multiple relations as belongs_to-statements, for example a book. A book has a author (user) and a publisher:

belongs_to :user
belongs_to :publisher

Great. The user is signed to a publisher via a has many :through

has_many :contracts
has_many :publishers, through: :contracts

Same goes for the publisher model. Both, author and publisher have many books. So far so good. Now you have a publisher-show-view in which you render the book's form-partial, 'cause you want to add a book directly from the publisher's 'show'-view.

Now, you want to submit the form and cause to the relations, you have to feed the book model with the publishers and the authors-data.

The question is now, how to do this. Merging data into the params in the book's create method seems to work good: found on stackoverflow.

I've red about creating a hidden field in the form with the author_id but didn't go after it, cause it felt dirty somehow.

What would be the 'right' way to do this? Thanks in advance...

Paulo Fidalgo · Accepted Answer · 2013-05-17 11:01:10Z

You can do it using Nested models forms and Nested attributes. You have two RailsCasts on the subject: part 1 and part 2 where you can see how it works. Also the mandatory documentation on subject.

If you option for this way here are an updated method versions for the latest rails versions:

  def link_to_remove_fields(name, f)
    f.hidden_field(:_destroy) + link_to_function(name, "remove_fields(this)", :class => "icon-remove")
  end

  def link_to_add_fields(name, f, association)
    new_object = f.object.class.reflect_on_association(association).klass.new
    fields = f.fields_for(association, new_object, :child_index => "new_#{association}") do |builder|
      render(association.to_s.singularize + "_fields", :f => builder)
    end
    link_to_function(name, "add_fields(this, \"#{association}\", \"#{escape_javascript(fields)}\")")
  end

because the screencast version will not work on later versions of rails.

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